• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    ARRANGEMENT FOR INTRAORAL X-RAY IMAGE GENERATION. The invention relates to an intraoral X-ray imaging arrangement that includes an imaging sensor (30) arranged positionable within a patient's mouth and an imaging arrangement control system. The control system is arranged in functional connection with a means which has been arranged to send measurement signals to the control system informing the position of at least one component included in the arrangement. With respect to the imaging sensor (30), and a radiation source (4) included in the arrangement, means (A, M, G) were arranged to measure its spatial position and send measurement signals based on these measurements to the system. control array arranged with a means for determining, based on said measurement signals, information about the mutual spatial position of the imaging sensor (30) and the radiation source (4), or of a component (40, 50) arranged in the radiation source (4).
    公开号:BR112013024262B1
    申请号:R112013024262-0
    申请日:2012-03-21
    公开日:2022-01-25
    发明作者:Christian De Godzinsky；Kustaa Nyholm
    申请人:Planmeca Oy；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] The present invention relates to mutual positioning of an intraoral X-ray device and an intraoral X-ray sensor with respect to an imaging event. BACKGROUND OF THE INVENTION
    [002] Dental intraoral X-ray images are taken using X-ray examination devices that typically include a multi-hinged arm construction and an X-ray source placed within a housing. Typically, a long collimator limiting an X-ray beam was fixed or arranged to be attached to the housing. The imaging process includes placing the X-ray device in close proximity to the object area to be viewed and aiming the X-ray beam such that it will strike the sensor in a correct orientation and at a desired angle. Typically, someone aims to arrange the beam perpendicular to a film or some other image information detector used in imaging.
    [003] Problems related to aiming and orienting the beam evenly and the beam not being tilted or turned with respect to an image data receiving medium are generally known to dental professionals. Thus, different aiming arrangements were developed to facilitate the correct positioning of the X-ray source in relation to the sensor. A prior art approach is to hold the X-ray source and image data receiving medium, such as a film, phosphor imaging plate, CCD sensor, or some other digital sensor, physically together. another for the duration of an exposure. Some prior art systems and assemblies using this approach are disclosed in patent specifications US 6,343,875 B1, US 5,632,779 A, US 4,507,798 A and US 4,554,676 A.
    [004] However, many dental professionals find these systems, where the sensor placed inside the patient's mouth should be physically connected to the X-ray device, difficult to use in practice. One reason for this is, first, that if all mounting connections are made prior to positioning the sensor in the mouth, it has proved difficult to aim the entire relatively heavy construction including the X-ray tube and its arm construction in a precisely correct position. desired in a given case. Secondly, if the sensor is first placed in the correct position in the mouth, it has proved difficult, for example, to attach an aiming shaft to mount the construction such that the attachment process would not cause the sensor to move or cause discomfort to the patient.
    [005] In the field, someone was also contemplating arrangements in which information about the position of the image generation sensor would be obtained through sensors detecting the position, belonging to the image generation arrangement. INTER ALIA, a magnetic field was exposed for use in positioning, but there has, for example, been no such arrangement based on measurement signals on the market that would be able to unambiguously determine the mutual spatial location and orientation of the imaging sensor and of the radiation source, left alone to adjust and aim the beam precisely at the sensor based on that information. Again, evidently the only procedure on the market to adjust the size or shape of the beam generated by the intraoral X-ray device that one would consider to be based on the technical arrangements of the device itself was the manual replacement of collimator plates, collimator tubes or equivalent arranged in connection with the radiation source. SUMMARY OF THE INVENTION
    [006] The objective of the present invention and its preferred embodiments is to provide modern arrangements for discovering the position of an intraoral imaging sensor, particularly with respect to the beam generated by an X-ray source to be used in imaging and, especially considering preferred embodiments of the invention, among others, modern solutions for limiting the beam with respect to oral X-ray imaging.
    [007] By means of the invention and its preferred embodiments, the true mutual positioning of the intraoral X-ray source and the imaging sensor can be monitored even in real time and without having to visually estimate their mutual position, which can be challenging especially within the context of intraoral imaging when operating in accordance with the prior art, when at the time of exposure the imaging sensor is typically located partially or completely out of sight within a patient's mouth.
    [008] Essential features of the invention and its preferred embodiments are presented in the attached patent claims. The basic idea of the invention includes arranging means in connection with both the intraoral imaging sensor and the radiation source to measure their spatial position, and, additionally, means for the control system of the array to generate information based on said imaging signals. measurement on the mutual positioning of the imaging sensor and the radiation source. In a preferred embodiment of the invention, a three-axis magnetic sensor as well as a three-axis acceleration sensor are arranged in connection with both the imaging sensor and the radiation source, based on measurement signals obtained from which, the The array's control system is configured to set both the mutual tilt angle of the imaging sensor and the radiation source and their mutual spatial orientation.
    [009] Thus, in a preferred embodiment of the invention, a three-axis magnetic sensor is arranged, on the one hand, in connection with the imaging sensor, preferably substantially at the center point of its imaging area behind the sensor, on the other hand, in connection with the X-ray source, preferably in proximity to the collimator structure of the X-ray source. In a preferred embodiment of the invention, in connection with the imaging sensor and the radiation source is additionally arranged a three-axis acceleration sensor. Then, it is possible to calculate based on measurement signals obtained from the sensors, first, the mutual tilt of the imaging sensor and the X-ray source, and second, rotation in a three-dimensional set of coordinates.
    [010] The use of the aforementioned acceleration and magnetic sensors is based on an idea of using measurement information about the Earth's magnetic and gravitational fields. In a preferred embodiment of the invention, a known magnetic field generated by the arrangement itself is included in this system. This field can then be used to resolve, based on generated measurement signals to be used in the array, a directional vector defining the mutual location of the imaging sensor and the radiation source.
    [011] Thus, preferred embodiments of the invention also enable to discover the location of the center of the imaging area of the imaging sensor in relation to the beam center radius, as well as the distance between the imaging sensor and the radiation source, and so also between the sensor and a collimator preferably arranged for the radiation source. This data is especially needed when one wants the imaging array control system to be able either automatically or guided to fix the mutual positioning of the imaging sensor and the radiation source such that the sensor is completely within the beam. , the center beam of the beam is incident at the center of the imaging area of the sensor, and the X-ray beam is substantially precisely limited according to the imaging area of the imaging sensor.
    [012] Consequently, in a preferred embodiment of the invention, in connection with the collimator structure of the radiation source, a thin ring-like coil is preferably arranged, which is arranged to generate a controlled direct current magnetic field. Then, in a manner described in more detail below, it is possible to solve based on measurement signals obtained from the three-axis magnetic sensor arranged in connection with the imaging sensor at what distance and in which direction the imaging sensor is located with respect to the radiation source (i.e. with respect to said coil).
    [013] In a preferred embodiment of the invention, means are arranged to the control system array to prevent exposure when based on the measurement signals generated by the system when the imaging sensor is not in the beam or close enough to the radiation source. Correspondingly, the array can be set to automatically arm to an exposure standby mode when the imaging sensor is detected to be located within the X-ray beam area. The array can even be configured with an operating mode for independently take an image in a situation when it recognizes that predetermined location and orientation criteria are met. So in one embodiment of the invention, a trigger, which is used in normal operation to give a start signal for the display, can be arranged to operate as a safety device that gives a signal to allow automatic activation or to turn the switch on/off. automatic exposure mode.
    [014] By means of the invention and its preferred embodiments to be described in more detail below, it is possible to automatically detect the location of the imaging sensor with respect to the radiation source relative to the angle of inclination, rotation and distance as well as the location of the center of the sensor's imaging area relative to the center radius of the X-ray beam. This enables to guide the user, for example, into a viewfinder or some other means of transmitting information to fix the mutual position of the radiation source and sensor as desired. Additionally, collimation of the beam to the sensor can be motorized so that the operator does not need to take care of the collimation, but the imaging array takes care of this automatically.
    [015] In the following, preferable principles and embodiments of the present invention will be described in more detail by way of examples. The embodiments in question are presented as examples and are not intended to show all possible conceivable different configurations and modifications of the invention, but characteristic aspects of the invention are defined in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS
    [016] Figures 1, 2a and 2b show a typical intraoral X-ray device.
    [017] Figure 3 shows basic components of an arrangement according to a preferred embodiment of the invention.
    [018] Figure 4 shows a magnetic field that can be generated by a coil shown in Figure 3. DETAILED DESCRIPTION OF THE INVENTION
    [019] Figures 1, 2a and 2b show a typical intraoral X-ray device (1) that includes a control panel (2), an articulated arm construction (3) and an X-ray source (4). Figure 2b further shows a long collimator tube (4'), which can be attached to an X-ray source housing (4) to limit the X-ray beam more precisely and thus minimize the radiation dose received by a patient.
    [020] Figure 3 shows basic components of an arrangement according to a preferred embodiment of the invention. The arrangement first includes a coil (50) arranged in proximity to a motorized collimator plate structure (40) located with respect to the collimator tube (4') of the radiation source. The collimator plate structure (40) in question is arranged to form an adjustable aperture and thus limit the radiation generated by the radiation source to a beam as desired. Preferably, this structure is positioned at a distance from that opening of the collimator tube from which the beam generated by the radiation source is aimed at the object. The coil (50) is preferably connected to a source of direct current (PW), which provides current as pulsed. Preferably, the coil (50) is arranged in connection with the collimator tube (4') concentrically with the collimator plate structure (40). In connection with the radiation source, preferably in connection with said collimator plate structure (40), a three-axis gyro sensor (G2) and three-axis magnetic and acceleration sensors (A2, M2) are also arranged. In connection with the radiation source or in some other suitable place a visor (D) is also arranged.
    [021] Correspondingly, in connection with the imaging sensor (30) a three-axis gyro sensor (G1) and three-axis magnetic and acceleration sensors (A1, M1) are arranged. Of these, preferably the magnetic sensor (M1) is arranged substantially at the center of the image generating area of the sensor, on the side of the sensor opposite to where a pixel array of the sensor detecting radiation is located. The sensors belonging to the array according to Figure 3 are arranged in functional connection with a control system of the array, which can be located, for example, on a regular PC, but also elsewhere, for example, at least for some of its parts with respect to the radiation source (4). The control system is configured to receive measurement signals from the sensors and, based on them, generate information related to the position and location of the image generation sensor (30) and the radiation source (4) belonging to the image generation arrangement. Furthermore, the control system either controls the pulse of the power source (PW) of the coil (50) or at least information about the pulse in question is loaded or has been loaded thereto.
    [022] It should be emphasized here that the arrangement according to Figure 3 forms a combination of several preferred embodiments of the invention, that is, the basic idea of the invention can also be realized with other types of arrangements than the one shown in Figure 3 and all practical embodiments of the invention do not necessarily employ all of the components or arrangements shown in Figure 3.
    [023] In the following, the purpose and operation of different components and partial arrangements of the arrangement according to Figure 3 will be examined in more detail.
    [024] The acceleration and magnetic sensors (A1, A2, M1, M2) are arranged in functional connection with the control system, which includes means to define, based on measurement signals obtained from those sensors, the orientation of the sensor (30) and of the radiation source (4) with respect to the Earth's gravitational and magnetic fields. Furthermore, the control system includes means for determining the location of the magnetic sensor (M1) arranged to the sensor (30) with respect to the magnetic field generated by the coil (50) arranged in connection with the radiation source (4).
    [025] Information about the mutual orientation of the sensor (30) and the radiation source (4) essentially relating to carrying out the invention can be discovered with a multiphase calculation that is based on various measurement signals. Employable in the invention are, for example, three-axis magnetic and acceleration sensors, i.e. sensors which are arranged with three individual sensor units arranged at different solid angles to each other. Such sensors are also commercially available, for example, HMC5843 GMR magnetic sensor from Honeywell and KXPS5-2050 acceleration sensor from Kionix. Such sensors can also measure in addition to the strength of a magnetic or gravitational field the direction of a field vector at the point of measurement. So, acquiring information from the array according to Figure 3 may include calculating a cross product of the directional vectors measured by the acceleration and magnetic sensors (A1, M1; A2, M2). This cross-product vector is thus at right angles to both the gravitational field and the Earth's magnetic field. When a second cross product is additionally formed between the first cross product formed and a measured acceleration vector, these two cross products and the acceleration vector form axes of an orthogonal set of coordinates, the orientation of which with respect to the magnetic field and field Earth's gravity is known. When the array control system knows how the acceleration and magnetic sensors (A1, A2, M1, M2) are positioned in connection with the radiation source (4) and the sensor (30), it is additionally known how they would be positioned. in the coordinate set as above, whereby it is also possible to determine the mutual spatial orientation of the radiation source and the sensor. Thus, one can find, for example, the slope between a surface including the imaging area of the sensor (30) and a surface including the collimator aperture of the collimator structure (40) located at the radiation source (4), and also the rotation of the sensor (30) with respect to the beam generated by the radiation source (1).
    [026] With respect to intraoral X-ray imaging, there is typically less than a dozen centimeters distance between the sensor (30) and the radiation source (4) during exposure. Consequently, determining the mutual position as above is based on an assumption that the Earth's magnetic field is substantially the same at the point of both the sensor (30) and the radiation source (4), and that any disturbance, up to even the local ones in the Earth's magnetic field can substantially change this state of affairs. Furthermore, it is significant for the functioning of the arrangement that such measurement signals are used that were obtained in a situation where the sensor (30) and the radiation source (4) are in unaccelerated motion, i.e. essentially stationary, in the practice.
    [027] In practice, signals obtained from sensors of the previous type (A1, A2, M1, M2) have to be subjected to various filtering, for example, low-pass filtering. Because of this, there may be slight delays in acquiring information of the above type. On the other hand, the measurement signal obtained from the acceleration sensor (A1, A2) cannot be used effectively in situations where the sensor is in an acceleration movement.
    [028] A rotation sensor (G1, G2) is a sensor that the integral of the measurement signal obtained from which reveals the position of the sensor with respect to a reference position of the sensor used in a given case. An example of such a sensor is the ITG-3200 product from the manufacturer InveSense. The measurement signal obtained from such a sensor is not, however, constant with respect to time, but there is some drift. Thus, using only gyro sensors (G1, G2) is not necessarily an optimal solution for the practical operation of the present arrangement, but with the help of a gyro sensor or gyro sensors, the operation of the previous arrangement based on the magnetic and acceleration (A1, A2, M1, M2) can be accelerated. In such an embodiment of the invention, the arrangement can be implemented such that the integrated signal from the gyro sensor (G1, G2) is corrected as a function of time, for example using Kalman filtering, for example correcting said integrated signal by filtered signals that are constant, but time consuming, obtained from the other sensors (A1, A2, M1, M2) in the array.
    [029] The power source (PW) of the coil (50) arranged in connection with the radiation source is a direct current source which is arranged to provide current preferably as pulsed. Then, the coil (50) generates a controllably alternating magnetic field. Preferably, the power source is cut off at a low frequency either as controlled by the control system or such that the control system still has information about what type of a magnetic field the coil (50) generates at each moment in time or is generated. any field at all. Preferably, this arrangement thus generates at a desired periodicity a controlled direct current magnetic field of a desired size, preferably always of the same size and, for example, such that the field strength is constant and its magnitude at some desired point at a distance in the range of about 5-15 cm from the coil is on the order of 0.4 G.
    [030] Next, this arrangement according to the invention will be discussed first theoretically, without the effect of the Earth's magnetic field. When the position of the imaging sensor (30) in the magnetic field generated by the coil (50) arranged in connection with the radiation source (4) is varied, the three-axis magnetic sensor (M1) arranged in connection with the sensor generator (30) sees the magnetic field generated by the coil (50) differently depending on where the magnetic sensor (M1) is positioned in this field. An individual sensor of the three-axis magnetic sensor (M1) whose position in the magnetic field is parallel to the field vector at a point in question does not detect the magnetic field at all, the measurement signal of a sensor located perpendicularly to the magnetic field vector field equals the field strength at the point in question, and the signal strength measured by a sensor orienting at an angle to the field vector is cos(0) of the field strength at the point in question. When the magnetic field generated by the coil (50) is known, the mutual intensities of partial signals measured by the individual sensors of the three-axis magnetic sensor (M1) define a field vector of specific direction and size, which, again, unambiguously defines the location of the magnetic sensor in the magnetic field generated by the coil (50). Figure 4 shows vectors having a specific direction and magnitude (length) that can be determined based on a measurement signal from a magnetic sensor applicable for use in the invention when placed at the locations of the vectors. It is then possible based on the measurement signal generated by the magnetic sensor (M1), for example, to locate the center of the imaging area of the imaging sensor (30) - at the point at which the magnetic sensor (M1) is located. preferably located on the sensor also - on the axis of symmetry of the magnetic field generated by the coil (50) at a known distance from the coil (50). When the coil (50) is arranged to the radiation source (4) such that the axis of symmetry of the magnetic field generated by it coincides with the center axis of the X-ray beam generated by the radiation source (4), one is able to based on this principle of positioning the image generation sensor (30) at the center of the beam generated by the radiation source (4).
    [031] In practice, acting in accordance with the previous theoretical consideration would not lead to a desired end result as there, the effect of the Earth's magnetic field on the measurement signals is not taken into account. In order to be able to determine only the effect of the magnetic field generated by the coil (50) on the measurement signals of the magnetic sensor (M1) arranged in connection with the image generation sensor (30), pulsation of the direct current source ( PW) of the coil (50) according to a preferred embodiment of the invention is used. Therefore, the sensor signals can be looked at both at times when they measure only the Earth's magnetic field and at times when they also measure the magnetic field generated by the coil (50). When the effect of the Earth's magnetic field is eliminated from the result that is obtained by measuring the combined effect of the magnetic field generated by the coil (50) and the Earth's magnetic field and when the magnetic field generated by the coil is known, it is possible based on the measurement signals define a vector that unambiguously defines the location of the imaging sensor (from the magnetic sensor (M1) positioned on the sensor) in the magnetic field generated by the coil (50) arranged in connection with the radiation source (4) - and when the location of the coil (50) in the radiation source (4) is known, also its location with respect to the radiation source (4).
    [032] Determining location as discussed above may according to an embodiment of the invention be based on a calculation in which the magnetic field generated by the coil (50) arranged in connection with the radiation source is modeled first. The magnetic field modeling can be based on concrete measurements of the magnetic field generated by the array within a desired operating sector of the radiation source (4) or it can be implemented through a function of relationship between location and direction as well as the field intensity. Consequently, it is possible to form an error function between this model and the directional vector measured by the magnetic sensor (M1) arranged to the imaging sensor (30). A minimum value with respect to position for this error function can be discovered, for example, by iterating with the Newton-Raphson method. This iteration results in the previous vector, which unambiguously defines the location of the magnetic sensor (M1) in the array. In a preferred embodiment of the invention, these location data may be further transformed to such a set of coordinates as determined above, whereby as the end result is a determination of both the location of the imaging sensor (30) determined by means of the magnetic field generated by the coil (50) and the orientation of the sensor (30) with respect to the beam generated by the radiation source (4) as discovered in a manner described above.
    [033] The transformation of location data can be implemented, for example, such that, if designating the first cross product of the coordinates obtained from the measurement signals of the vector of magnetic and acceleration sensors (Y), and the cross product of this vector (Y) and a vector (A) obtained from the acceleration sensor vector (X), the vectors (X, Y, A) form axes of such an orthogonal set of coordinates (M), expressed in the measurement coordinates of the acceleration sensors and magnetic, the x and y axes of which are parallel with the Earth's surface, the z axis points downward, and the x axis is parallel with the magnetic field. Defining such a transformation (T), which rotates the vector (Y) to be parallel with a vector (0,1,0) i.e. the y-axis, and the vector (X) to be parallel with a vector (1, 0.0) that is, the x axis, a transformation is obtained whereby it is possible to move between the set of coordinates of the measurement signals from the magnetic and acceleration sensors and the set of coordinates defined by the Earth's magnetic and gravitational fields .
    [034] In connection with the collimator plate structure shown in Figure 3, means are preferably arranged to adjust at least one dimension of the collimator aperture, preferably adjust at least the shape and size of the collimator aperture. Also the orientation, location and position of the collimator aperture can be arranged adjustable, although the orientation and direction of the beam can be adjusted by moving the current radiation source, too. The functions of the collimator plate structure may be motorized, preferably at least the function of adjusting the size and/or shape of the collimator aperture. The motorized function can be automated to adjust the collimator aperture according to signals received from the array control system, which signals are based on information generated by the array control system at the mutual position of the imaging sensor (30) and the radiation source (4) and, additionally, information about the shape and size of the imaging sensor (30) used in the array. Information relating to the sensor being used can be input to the array manually or, alternatively, means may be arranged in connection with the sensor (30) whereby information relating to the sensor being used (sensor size) is uploaded to the array automatically. Accordingly, the arrangement may include means for receiving information about the imaging sensor (30) that is to be used in imaging, or receiving information on the shape and size of the imaging area from the imaging sensor. (30) in question. Such means may include a user interface, from which said information is editable arranged, or the arrangement may include means for receiving the information in question over a wired or wireless link directly from the sensor in question. It is also possible to prearrange control system information, for example, on various typical characteristics of an aperture limited by the collimator structure (4', 40), such as its size, shape, location, and aperture position, by means of that motorization control can be arranged to occur based on control signals being based on such information pre-set and obtained from the array's control system.
    [035] Information corresponding to that being transmittable to the automated collimator can be arranged to be presented visually on a display, whereby mutual positioning of the sensor and radiation source can be done manually as guided by the display. In the viewfinder, a virtual image of the sensor (30) or the collimator aperture limited by the collimator plate (40) structure or equivalent, or both, can be arranged to be displayed, or even of the beam in the orientation where it would be with respect to to the sensor (30) if the exposure was to be started at a given time. Such a display is preferably arranged in connection with the radiation source. By this type of an arrangement it is not only possible to solve the problem that it is practically impossible to see precisely in which position the sensor (30) is in a patient's mouth, but also this type allows to take a step further from human sensory aim to aim. automatic that is based on measurement signals.
    [036] The control system may be provided with means to prevent exposure if the mutual positioning of the sensor and the radiation source does not meet a predetermined accuracy criterion and/or if, for example, a signal is received from the sensor's acceleration sensor. that is in an acceleration motion greater than the predetermined threshold value.
    [037] On the other hand, and especially due to a context of hand-held use of the X-ray source, the arrangement can also be implemented in order to automatically initiate an exposure as a response to recognizing that the beam is correctly positioned with respect to the beam. sensor and the sensor is accelerating slower than the predetermined threshold value.
    [038] While certain preferred embodiments of the invention have been discussed above, many of the details can also be implemented otherwise without departing from the basic idea of the invention. For example, measurement sensors do not necessarily have to be particularly three-axis, although using three is quite adequate. When using magnetic and acceleration sensors, the use of gyro sensors is not necessary, and different embodiments of the invention may vary, INTER ALIA, within the extent described above with respect to Figure 3. Substantially, the arrangement includes means arranged in connection with the imaging sensor and the radiation source to measure its spatial position and send measurement signals based on these measurements to the array control system, which means are preferably at least magnetic sensors. By properly choosing sensors and providing the array with a means to generate a magnetic field in a controlled manner, it is possible to resolve the mutual distance, orientation, angle, location, rotation, or any other equivalent term that one wishes to use, of the sensors, and therefore , of the components to which they are attached. All calculations related to such determinations can be arranged as part of the array's control system and thus, in the array, collimation can be implemented as motorized, automatically, or controlled as based on measurement information generated by the array, not only to point out the beam correctly, but also to adjust the size, shape, orientation, etc., of the optimal beam for each image generation.
    权利要求:
    Claims (17)
    [0001]
    1. Intraoral X-ray imaging arrangement, which includes as separate structures, first, a radiation source (4) having a collimator structure (4', 40) limiting an X-ray beam to generate the beam used in image generation and to point it at the object to be visualized, secondarily, an image generation sensor (30) arranged positionable inside a patient's mouth (30), and an image generation arrangement control system, the control system being arranged in functional connection with at least a first medium belonging to the image generating arrangement, which medium is arranged to transmit to the control system measurement signals including information about a position of at least one component of the arrangement, characterized by fact that the arrangement includes a means (A, M, G) arranged with respect to both the imaging sensor (30) and the X-ray source (4) to measure their spatial position and send measurement signals based on these measurements for the control system of the array, said means for generating measurement signals includes a three-axis acceleration sensor (A1, A2) arranged in connection with, first, the imaging sensor (30) and, secondarily, the source of radiation (4), and by the fact that a means is arranged to the control system to determine based on said measurement signals information about the mutual spatial position of the imaging sensor (30) and the radiation source (4), or a component (40, 50) arranged to the radiation source (4).
    [0002]
    2. Image generation arrangement according to claim 1, characterized in that said means for generating measurement signals includes at least one three-axis magnetic sensor (M1) arranged in connection with the image generating sensor (30) .
    [0003]
    3. Image generation arrangement according to claim 1 or 2, characterized in that said means for generating measurement signals includes at least one three-axis magnetic sensor (M2) arranged in connection with the radiation source (4) .
    [0004]
    4. Image generation arrangement according to any one of claims 1 to 3, characterized in that said means for generating measurement signals includes at least one three-axis acceleration sensor (A1) and at least one magnetic sensor of three axes (M1) arranged in connection with the imaging sensor (30) and at least one three-axis acceleration sensor (A2) and at least one three-axis magnetic sensor (M2) arranged in connection with the power source radiation (4), and that the control system is provided with means for calculating on the basis of measurement signals obtained from said sensors (A, M) a mutual spatial orientation of the imaging sensor (30) and the radiation source. (4), or a component (40, 50) arranged to the radiation source (4).
    [0005]
    5. Image generation arrangement according to any one of claims 1 to 4, characterized in that in connection with said collimator structure (40) a coil (50) is arranged which is arranged in functional connection with a source of energy (PW), and that the control system is provided with a means to controllably generate a direct current magnetic field by means of said coil (50), said means (A, M, G) for measuring the position of the generation sensor (30) and the radiation source (4) includes at least one three-axis magnetic sensor (M1) arranged in connection with at least the imaging sensor (30), and that the control system is provided with means for calculating on the basis of measurement signals obtained from the magnetic sensor (M1) in question, which signals were measured both in situations where said coil (50) is arranged by means of said power source (PW) to induce a magnetic field and in situations where said coil (50) does not induce a ma field at least one of the following: i) a distance between the imaging sensor (30) and the radiation source (4) or some component (40, 50) arranged to the radiation source (4); ii) a direction or a distance, or both of these, which the imaging sensor (30) is located with respect to the center axis of the beam generated by the radiation source (4); iii) a directional vector defining the location of the magnetic sensor (M1) in question in the magnetic field generated by the coil (50).
    [0006]
    6. Image generation arrangement according to claim 5, characterized in that said means for calculating based on measurement signals the mutual spatial position and location of the image generation sensor (30) and the radiation source (4) includes an algorithm recorded on a data storage medium that is arranged to solve at least one or all of the following: i) first, based on measurement signals from acceleration sensors (A1, A2) arranged in connection with the generation sensor (30) and the radiation source (4), secondarily based on the measurement signals from the magnetic sensors (M1, M2) arranged in connection with the image generating sensor (30) and the radiation source (4) measuring the Earth's magnetic field, the mutual inclination angle of the imaging sensor (30) and the radiation source (4), or some component (40, 50) arranged to the radiation source (4), together with coordinates; ii) first, based on the measurement signals from the acceleration sensors ration (A1, A2) arranged in connection with the imaging sensor (30) and the radiation source (4), secondarily based on the measurement signals from the magnetic sensors (M1, M2) arranged in connection with the imaging (30) and the radiation source (4) measuring the Earth's magnetic field, the mutual orientation of the imaging sensor (30) and the radiation source (4), or some component (40, 50) arranged to the radiation source (4), in a set of coordinates; iii) based on the measurement signal from the magnetic sensor (M1) arranged in connection with the imaging sensor (30) of the difference of, first, the signal of measurement of the magnetic field generated by the coil (50) and, second, of the measurement signal by measuring the Earth's magnetic field, a distance between the imaging sensor (30) and the radiation source (4), or some component ( 40, 50) arranged to the radiation source (4); iv) based on the measurement signal from the magnetic sensor (M1) arranged in connection with the generator sensor imaging (30) the difference of, first, measuring the magnetic field generated by the coil (50) and, second, the measurement signal measuring the Earth's magnetic field, a direction or a distance, or both of these, where the imaging sensor (30) is located with respect to the axis of symmetry of the magnetic field generated by the coil (50);v) based on the measurement signal from the magnetic sensor (M1) arranged in connection with the imaging sensor (30) from the difference of, first, the measurement of the magnetic field generated by the coil (50) and, second, of the measurement signal measuring the Earth's magnetic field, a direction vector defining the location of the magnetic sensor (M1) in question in the magnetic field generated by the coil (50).
    [0007]
    7. Image generation arrangement according to claim 5 or 6, characterized in that said coil (50) is placed in connection with the collimator structure (4', 40) such that the symmetry axis of the generated magnetic field by the coil (50) coincides with the center radius of the X-ray beam generated by the radiation source (4) and limited by the collimator structure (4', 40) of the radiation source (4).
    [0008]
    8. Image generation arrangement according to any one of claims 1 to 7, characterized in that said means for generating measurement signals includes at least one three-axis magnetic sensor (M1) arranged in connection with the generation sensor image sensor (30), the individual sensors of which being located substantially close to each other and/or substantially in the middle of the center of the image area of the image generating sensor (30).
    [0009]
    9. Image generation arrangement according to any one of claims 1 to 8, characterized in that in connection with at least one of the components, the image generation sensor (30) and the radiation source (4) of the arrangement is arranged a turn sensor (G1, G2) which is arranged to send position information to the control system of the array, which control system is arranged to correct as a function of time the position information obtained from the turn sensor ( G1, G2) based on a measurement signal obtained from at least one other sensor (A1, A2, M1, M2) measuring the position.
    [0010]
    10. Image generation arrangement according to any one of claims 1 to 9, characterized in that the arrangement includes a display (D) or other means for transmitting information, which is arranged in connection with the radiation source (4 ) or physically separate from the array, and that the control system is arranged to generate position information related to the mutual location or position, or both, of the imaging sensor (30) and the radiation source (4) in a form graphic or other, to be displayed on the display (D) in question or other means for transmitting information.
    [0011]
    11. Image generation arrangement according to claim 9, characterized in that said means for transmitting information is a display (D) and the control system is provided with means for displaying a virtual image of the sensor (30) or the collimator aperture limited by the collimator plate structure (40) or equivalent, or both, or the beam in an orientation in which it would at any given time with respect to the sensor (30), if exposure were to be initiated at that time in question.
    [0012]
    12. Image generation arrangement according to any one of claims 1 to 11, characterized in that said collimator structure (4', 40) is implemented as adjustable such that an opening of the collimator structure (4', 40 ) limiting the X-ray beam is adjustable by considering at least one of the following: aperture size, aperture shape, aperture location, aperture position.
    [0013]
    13. Image generation arrangement according to any one of claims 1 to 12, characterized in that said adjustment of the aperture of the collimator structure (4', 40) limiting the X-ray beam is arranged motorized and motorization control in question happens based on control signals received from the control system of the array, which control signals are arranged at least partially to be based on information calculated based on said measurement signals of the mutual spatial position or location, or both, of the sensor of image generation (30) and radiation source (4).
    [0014]
    14. Image generation arrangement according to any one of claims 1 to 13, characterized in that said adjustment of the aperture of the collimator structure (4', 40) limiting the X-ray beam is arranged motorized and motorization control in question is arranged to happen based on control signals received from the array's control system, which control signals are arranged to include information prefixed to fix at least one of the following: the size, shape, location, position of the aperture limited by the collimator structure (4', 40).
    [0015]
    15. Image generation arrangement according to claim 13 or 14, characterized in that in functional connection with the control system, a means is arranged to transmit information to the control system about the dimensions of the image area of the sensor for generating image (30) used in the array, and said control signals for the motorization are arranged to be based on calculated information based on measurement signals received from said medium (A, M, G) measuring the spatial position of the imaging sensor (30) and the radiation source (4), which information includes information about at least one of the following: a mutual tilt angle of the imaging sensor (30) and the radiation source (4); a mutual rotation of the imaging sensor (30) and the radiation source (4); a distance between the imaging sensor (30) and the radiation source (4).
    [0016]
    16. An imaging arrangement as claimed in any one of claims 1 to 15, characterized in that the arrangement includes a means for receiving information from an imaging sensor (30) intended to be used in imaging. , or information on the shape and size of an imaging area of said imaging sensor (30).
    [0017]
    17. Image generation arrangement according to claim 16, characterized in that said means includes a user interface from which information is arranged to be input, or a means for receiving said information over a wired or wireless connection. directly from said sensor.
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    同族专利:
    公开号 | 公开日
    KR20140018289A|2014-02-12|
    FI123713B|2013-09-30|
    FI20110104A|2012-09-22|
    FI20110104A0|2011-03-21|
    US20140010349A1|2014-01-09|
    CN103687543A|2014-03-26|
    JP2014508619A|2014-04-10|
    CN103687543B|2017-04-26|
    EP2688480A1|2014-01-29|
    WO2012127117A1|2012-09-27|
    EP2688480B1|2020-05-20|
    BR112013024262A2|2016-12-27|
    US9314216B2|2016-04-19|
    EP2688480A4|2015-09-23|
    JP6174561B2|2017-08-02|
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    法律状态:
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-12-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-12-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2022-01-25| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 21/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    FI20110104|2011-03-21|
    FI20110104A|FI123713B|2011-03-21|2011-03-21|Arrangements in connection with intraoral X-rays|
    PCT/FI2012/050288|WO2012127117A1|2011-03-21|2012-03-21|Arrangement for intra-oral x-ray imaging|
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