JP5592705B2 - Calibration data storage system - Google Patents

Description

  Embodiments described herein relate generally to an X-ray diagnostic apparatus and a calibration data storage system that correct an output of an X-ray detector.

  An X-ray diagnostic apparatus includes an X-ray tube that generates X-rays and an X-ray detector having two-dimensionally arranged semiconductor pixels that convert X-rays into electric charges. The subject is irradiated with X-rays, and X-rays transmitted through the subject are detected by an X-ray detector to generate X-ray projection data. It is known that the generated X-ray projection data is corrected based on calibration data calculated in advance by calibration.

  In recent years, effective utilization of X-ray detectors is desired in X-ray diagnostic apparatuses. An X-ray diagnostic apparatus that can be used for, for example, both standing and lying X-ray imaging by changing the installation position of the X-ray detector is known. There is also known an X-ray diagnostic apparatus that can be replaced with an X-ray detector having a different size depending on the body shape of the subject.

JP 2002-204793 A Japanese Patent Laid-Open No. 11-9579

  In an X-ray diagnostic apparatus in which an X-ray detector can be replaced, it is desirable that an X-ray detector used in another X-ray diagnostic apparatus can be used. However, if the X-ray detector is replaced, it is necessary to perform calibration using the attached X-ray detector, so there is a problem that it takes time until X-ray imaging can be performed.

  The embodiment has been made to solve the above-described problems, and an object thereof is to provide an X-ray diagnostic apparatus and a calibration data storage system that can reduce the time required for calibration.

In order to solve the above problem, a plurality of apparatus main bodies having an X-ray tube that generates X-rays to be irradiated on a subject, and X-rays transmitted through the subject from the X-ray tube are detected and X-ray projection is performed. A plurality of X-ray detectors detachably attached to the apparatus main body for generating data, and when the apparatus main body of the plurality of apparatus main bodies and the plurality of X-ray detectors are respectively combined a plurality of calibration data, a storage device for storing calibration data when a combination of one and either of the main unit and the apparatus main body other than the plurality of X-ray detector mounted on the device body when the X-ray detector Remove to X-ray detector calibration data does not exist among the plurality of X-ray detector is mounted, the stored calibration data based on There are, characterized in that it comprises a calculation unit for obtaining the corresponding calibration data.

The block diagram which shows the structure of the calibration data storage system which concerns on an Example. The figure which shows the detail of a structure of the 1st X-ray detector which concerns on an Example. The figure which shows the detail of a structure of the correction process part which concerns on an Example. The figure which shows the detail of a structure of the calibration data storage device which concerns on an Example. The figure which shows an example of the calibration data calculated by the calibration which concerns on an Example. The figure which shows an example which calculates the gain correction coefficient by the combination in which the calibration which concerns on an Example is not performed.

  Hereinafter, examples will be described with reference to the drawings.

  In the following, an embodiment of a calibration data storage system will be described with reference to FIGS.

  FIG. 1 is a block diagram illustrating the configuration of the calibration data storage system according to the embodiment. The calibration data storage system 300 is provided in a medical facility and is obtained by calibration of N (N is an integer of 2 or more) X-ray diagnostic apparatuses connected via the network 200 and calibration of the X-ray diagnostic apparatus. Calibration data storage device 210 for storing calibration data to be stored. Hereinafter, an example of the X-ray diagnostic apparatuses 100, 110, and 120 when N is 3 will be described.

First, an outline of the configuration of each X-ray diagnostic apparatus 100, 110, 120 will be described.
The X-ray diagnostic apparatus 100 includes an apparatus main body 10 that irradiates a subject P with X-rays and generates image data in accordance with the irradiation. A portable first X-ray detector that is detachably attached to the apparatus main body 10 as a standard type and detects X-rays transmitted through the subject P from the apparatus main body 10 to generate X-ray projection data. 20 is provided.

  The X-ray diagnostic apparatus 110 includes an apparatus main body 111 configured in the same manner as the apparatus main body 10 of the X-ray diagnostic apparatus 100. In addition, the X-ray projection data is generated by detecting X-rays that are attached to the apparatus main body 111 as a standard model and are transmitted through the subject P from the apparatus main body 111. The portable 2nd X-ray detector 112 comprised similarly to the 1st X-ray detector 20 except a different point is provided.

  Furthermore, the X-ray diagnostic apparatus 120 includes an apparatus main body 121 configured similarly to the apparatus main body 10 of the X-ray diagnostic apparatus 100. Further, the size of the region for detecting X-rays that is attached to the apparatus main body 121 as a standard type and is detachably attached and detects X-rays transmitted through the subject P from the apparatus main body 121 to generate X-ray projection data is different. Other than the above, a portable third X-ray detector 122 configured similarly to the first and second X-ray detectors 20 and 112 is provided.

  The apparatus main body 10 has a support mechanism that removably supports each of the first to third X-ray detectors 20, 112, 122. The first X-ray detector 20 includes the apparatus main bodies 10, 111 and 121 are detachably engaged with the connector. Then, for example, the first X-ray detector 20 is detached and attached to the size of the imaging region of the subject P, and the second or third X-ray detectors 112 and 122 are attached to the apparatus main body. 10 can be combined.

  Further, the apparatus main body 111 has a support mechanism that detachably supports the first to third X-ray detectors 20, 112, 122, and the second X-ray detector 112 includes the apparatus main bodies 10, 111 and 121 are detachably engaged with the connector. Then, if necessary, the second X-ray detector 112 can be detached and the first or third X-ray detector 20 or 122 can be attached and combined with the apparatus main body 111.

  Furthermore, the apparatus main body 121 has a support mechanism that detachably supports the first to third X-ray detectors 20, 112, and 122. The third X-ray detector 122 includes the apparatus main bodies 10, 111 and 121 are detachably engaged with the connector. Then, if necessary, the third X-ray detector 122 can be detached and the first or second X-ray detectors 20 and 112 can be attached and combined with the apparatus main body 121.

  As described above, X-ray imaging can be performed by nine combinations of the apparatus main bodies 10, 111, 121 and the first to third X-ray detectors 20, 112, 122 in combination.

  Next, details of the configuration of the apparatus main body 10 and the first X-ray detector 20 in the X-ray diagnostic apparatus 100 will be described. The apparatus main body 10 supplies a bed 11 on which the subject P is placed, an X-ray tube 12 that irradiates the subject P with X-rays, and a high voltage necessary for X-ray irradiation to the X-ray tube 12. A high voltage generation unit 13 and a moving mechanism unit 14 that moves the X-ray tube 12 and the first X-ray detector 20 are provided.

  In addition, the apparatus main body 10 corrects the X-ray projection data generated by the first X-ray detector 20 and a read control for controlling the first X-ray detector 20 and the correction processor 50. Unit 21, an image data generation unit 15 that generates image data based on the X-ray projection data corrected by the correction processing unit 50, and a display unit 16 that displays the image data generated by the image data generation unit 15. I have.

  Furthermore, the apparatus main body 10 includes an interface 17 that is a communication unit that communicates with the calibration data storage device 210 via the network 200, an operation unit 18 that inputs various commands, a high voltage generation unit 13, and a movement mechanism unit. 14, a read control unit 21, an image data generation unit 15, and a system control unit 19 that controls each unit of the interface 17.

  The X-ray tube 12 is disposed, for example, above the bed 11 so as to face the first X-ray detector 20, and includes an X-ray restrictor that limits the range of irradiation of the generated P-ray subject P. . The subject P placed on the bed 11 is irradiated with X-rays.

  The high voltage generator 13 is a high voltage generator that generates a high voltage to be supplied to the X-ray tube 12 and an X-ray that drives and controls the high voltage generator based on the X-ray irradiation conditions supplied from the system controller 19. A control unit is provided.

  For example, the moving mechanism unit 14 moves the X-ray tube 12 and the first X-ray detector 20 in the longitudinal direction of the bed 11 relative to the first X-ray detector 20. In particular, it is provided with a vertically moving mechanism or the like that moves in the direction of the bed 11 and the direction opposite to this direction.

  The correction processing unit 50 receives the first X-ray detectors 20, 112, and 122 from the calibration data storage device 210 that stores the calibration data when the device main body 10 is combined. Calibration data when the line detector 20 is detached and combined with either the apparatus main body 10 obtained when, for example, either the second or third X-ray detector 112, 122 is attached to the apparatus main body 10. Based on the above, the X-ray projection data generated by either is corrected.

  The image data generation unit 15 generates image data based on the X-ray projection data output from the correction processing unit 50. Then, the generated image data is output to the display unit 16. The display unit 16 includes a monitor such as a liquid crystal panel or a CRT, and displays the image data generated by the image data generation unit 15.

  The interface 17 detects the calibration data obtained by the combination of the apparatus main body 10 and the first X-ray detector 20, and the first X-ray detector 20 which is identification information for identifying the calibration data. The incidental information ID 11 including the device IDa 1 and the device ID b 1 for identifying the device body 10 is transmitted to the calibration data storage device 210 via the network 200.

  Further, in a state where X-ray irradiation during energization is stopped (standby), the second or third X-ray detectors 112 and 122 are attached to the apparatus body 10 after the first X-ray detector 20 is detached. To identify the second or third X-ray detectors 112 and 122 for requesting calibration data when the apparatus main body 10 and the second or third X-ray detectors 112 and 122 are combined. The devices IDa2, IDa3 and device IDb1 are transmitted to the calibration data storage device 210 via the network 200.

  Further, the second or third X-ray detectors 112 and 122 returned from the calibration data storage device 210 via the network 200 in response to the transmission of the detector IDa2 or the detector IDa3 and the device IDb1, and the device body 10 Is received, and the received calibration data is output to the system control unit 19.

  The operation unit 18 is an interactive interface including input devices such as a keyboard, a trackball, a joystick, a mouse, various switches, and the like. An input for executing calibration, an X-ray such as a tube current, a tube voltage, and an X-ray irradiation time. Input the irradiation conditions.

  The system control unit 19 includes a CPU and a storage circuit, and based on input information from the operation unit 18, a high voltage generation unit 13, a movement mechanism unit 14, a read control unit 21, an image data generation unit 15, and an interface 17. Control and control each unit.

  In addition, when the second or third X-ray detectors 112 and 122 are attached after the first X-ray detector 20 is detached from the standby apparatus body 10, the second or third X-ray detectors 112 and 122 are connected via the connector. The detector IDa2 or the detector IDa3 is read from the X-ray detectors 112 and 122. Then, in order to obtain calibration data from the calibration data storage device 210 when the second or third X-ray detector 112, 122 and the apparatus main body 10 are combined, the read detector IDa2 or detector IDa3, And the device IDb1 is supplied to the interface 17. In response to this supply, calibration data output from the interface 17 is supplied to the correction processing unit 50 via the read control unit 21.

  The first X-ray detector 20 is controlled by the read control unit 21. Then, X-rays irradiated from the X-ray tube 12 of the apparatus main body 10 and transmitted through the subject P placed on the bed 11 are detected and converted into electrical signals to generate X-ray projection data, and generated The X-ray projection data is output to the correction processing unit 50.

  The calibration data storage device 210 includes first to third X-ray detectors 20, 112, 122 transmitted from the device main bodies 10, 111, 121 via the network 200 for each calibration, and each device main body 10. , 111, 121 are stored as calibration data. Further, each of the first to third detectors IDa1, IDa2, IDa3 and the device IDb1, IDb2, IDb3 for identifying each device main body 10, 111, 121 is transmitted from each device main body 10, 111, 121. Calibration data when the X-ray detectors 20, 112, 122 and the apparatus main bodies 10, 111, 121 are combined is sent back to the apparatus main bodies 10, 111, 121 via the network 200.

Next, the configuration of the first X-ray detector 20 will be described in detail with reference to FIGS.
FIG. 2 is a diagram showing details of the configuration of the first X-ray detector 20. The first X-ray detector 20 includes a plurality of pixels 31 that convert X-rays into electric charges and accumulates them, and a TFT (Thin Film Transistor) 32 that is a semiconductor switch for reading out the electric charges accumulated in each pixel 31. A gate driver 33 that supplies a driving pulse for reading to each pixel 31, and a gate line 34 that connects each TFT 32 and the gate driver 33.

  The first X-ray detector 20 amplifies the charges read from each pixel 31 and converts them into voltages, a signal line 36 connecting each TFT 32 and the integration amplifier 35, and an integration amplifier 35. An amplifier 37 that amplifies the voltage from the amplifier 37, a multiplexer 38 that selects a signal corresponding to each pixel 31 from the amplifier 37, an A / D converter 39 that converts an analog signal from the multiplexer 38 into a digital signal, and an integrating amplifier 35 and an operation parameter setting unit 40 for setting conditions of the amplifier 37.

  The pixel 31 includes a large number of elements arranged two-dimensionally in the column direction and the line direction indicated by arrows. Each element includes a photoelectric film that generates charges according to the amount of incident X-rays, a charge storage capacitor that stores charges generated in the photoelectric film, and the like, and is connected to the source terminal of the TFT 32. The gate terminal and the drain terminal of each TFT 32 are commonly connected to each gate line 34 and each signal line 36 for each line in the line direction and the column direction. Hereinafter, in order to simplify the description, a configuration in which three sets of pixels 31 and TFTs 32 are arranged in the column direction and the line direction will be described.

  The gate driver 33 is controlled by the read control unit 21 and outputs a gate signal that is turned on and off for each TFT 32 connected via the gate lines # 1 to # 3 of the gate line 34. As a result, the charge accumulated in each pixel 31 is read through the source terminal of the TFT 32 and output from the drain terminal of the TFT 32.

  The signal line 36 includes signal lines # 4 to # 6, and charges from the drain terminals of the TFTs 32 in the respective columns connected to the signal lines # 4 to # 6 are converted into the integration amplifiers 35a to 35c of the integration amplifier 35. Pass through.

  The integrating amplifiers 35a to 35c amplify the electric charges from the TFTs 32 of the respective columns through the signal lines # 4 to # 6, convert them into voltages, and output the voltages to the amplifiers 37a to 37c of the amplifier 37. The amplifiers 37 a to 37 c further amplify the voltages of the integrating amplifiers 35 a to 35 c and output the amplified voltages to the multiplexer 38.

  The multiplexer 38 selects the output amplified by the amplifier 37 for each pixel 31 and outputs it to the A / D converter 39. The A / D converter 39 converts the analog signal from the multiplexer 38 into a digital signal and performs correction processing. To the unit 50.

Next, details of the configuration of the correction processing unit 50 will be described with reference to FIGS. 1 to 3.
FIG. 3 is a diagram showing details of the configuration of the correction processing unit 50. The correction processing unit 50 includes an offset correction processing unit 60 that corrects an offset component of the X-ray projection data output from the first X-ray detector 20, and the X-ray projection data output from the offset correction processing unit 60. A gain correction processing unit 70 that corrects a gain component and a defect point correction processing unit 80 that corrects a defect point in the X-ray projection data output from the gain correction processing unit 70 are provided.

  The offset correction processing unit 60 calculates an offset correction coefficient for correcting an offset component of the X-ray projection data, and an offset for storing the offset correction coefficient calculated by the offset correction coefficient calculation unit 61. A correction coefficient table 62 and an adder 63 that corrects an offset component of the X-ray projection data output from the first X-ray detector 20 are provided.

  The offset component includes a dark current included in each pixel 31 of the first X-ray detector 20, an offset of the integrating amplifier 35 and the amplifier 37, and the like, which varies depending on the temperature. Therefore, depending on the first X-ray detector 20, the offset component is corrected using an offset correction coefficient calculated by offset calibration performed at a predetermined short time interval during standby.

  The offset correction coefficient calculation unit 61 operates in accordance with an offset calibration instruction from the system control unit 19 performed via the readout control unit 21 and corresponds to each pixel 31 of the offset data output from the first X-ray detector 20. An offset correction coefficient is calculated from the obtained signal. When the first X-ray detector 20 is detached and the second or third X-ray detectors 112 and 122 are attached during standby, the second or third X-ray detector is connected via a connector. An offset correction coefficient is calculated from a signal corresponding to each pixel 31 of the offset data output from 112 and 122.

  The offset correction coefficient table 62 includes a nonvolatile memory such as a flash memory, and stores the latest offset correction coefficient calculated by the offset correction coefficient calculation unit 61.

  The adder 63 reads the latest offset correction coefficient stored in the offset correction coefficient table 62, and the read offset correction coefficient is generated by the first X-ray detector 20 by X-ray irradiation from the X-ray tube 12. The offset component of the X-ray projection data is corrected by subtracting from the X-ray projection data.

  When the second or third X-ray detector 112, 122 is attached, the second or third X-ray detector 112, which is the latest offset correction coefficient stored in the offset correction coefficient table 62, is used. The offset correction coefficient 122 is read out, and the read offset correction coefficient is subtracted from the X-ray projection data generated by the second or third X-ray detectors 112 and 122 by X-ray irradiation from the X-ray tube 12 to obtain X The offset component of the line projection data is corrected.

  The gain correction processing unit 70 is calculated by a gain correction coefficient calculation unit 71 that calculates a gain correction coefficient for correcting the gain component of the X-ray projection data output from the offset correction processing unit 60 and the gain correction coefficient calculation unit 71. A gain correction coefficient table 72 for storing the gain correction coefficient, and a multiplication unit 73 for correcting the gain component of the X-ray projection data output from the offset correction processing unit 60.

  The gain component includes the intensity distribution of X-rays emitted from the X-ray tube 12, the variation in sensitivity of each pixel 31 of the first X-ray detector 20, the integration amplifiers 35a to 35c and the amplifiers 37a to 37c. There are fluctuations in gain, etc., and it does not fluctuate for a long time. Therefore, depending on the X-ray tube 12 and the first X-ray detector 20, gain calibration when combined with the first X-ray detector 20 performed by input from the operation unit 18 at the time of installation or periodic inspection The gain component is corrected using the gain correction coefficient calculated by the process.

  The gain correction coefficient calculation unit 71 operates according to a gain calibration instruction from the system control unit 19 that is performed via the read control unit 21, and an offset correction processing unit 60 by X-ray irradiation for gain from the X-ray tube 12. The gain correction coefficient for matching the signal intensity corresponding to each pixel 31 of the gain data from the first X-ray detector 20 subjected to the offset correction to the predetermined reference value is calculated.

  The gain correction coefficient table 72 includes a nonvolatile memory, and stores the gain correction coefficient calculated by the gain correction coefficient calculation unit 71 as the latest correction coefficient. When the first X-ray detector 20 is detached and the second or third X-ray detectors 112 and 122 are attached to the standby apparatus body 10, the second supplied from the system control unit 19 is used. Alternatively, the gain correction coefficient when the third X-ray detectors 112 and 122 are combined with the apparatus body 10 is stored as the latest correction coefficient.

  The multiplication unit 73 reads the latest gain correction coefficient from the gain correction coefficient table 72, and the read gain correction coefficient is offset-corrected from the offset correction processing unit 60 by X-ray irradiation from the X-ray tube 12 and output. Multiply the data to correct the gain component of the X-ray projection data.

  The latest gain stored in the gain correction coefficient table 72 when the first X-ray detector 20 is detached and the second or third X-ray detectors 112 and 122 are attached to the apparatus main body 10. The gain component is corrected using the gain correction coefficient when the second or third X-ray detector 112, 122, which is a correction coefficient, and the apparatus body 10 are combined.

  The defect point correction processing unit 80 includes a defect point position calculation unit 81 that calculates defect point position information for correcting defect points in the X-ray projection data output from the gain correction processing unit 70, and a defect point position calculation unit 81. The defect point position information table 82 that stores the defect point position information calculated in step 1 and the defect point correction unit 83 that corrects defect points in the X-ray projection data output from the gain correction processing unit 70 are provided.

  The defect point corresponds to each pixel 31 of the first X-ray detector 20 and does not change for a long time. For this reason, it depends on the first X-ray detector 20 and is calculated by defect point calibration when combined with the first X-ray detector 20 performed by input from the operation unit 18 at the time of installation or periodic inspection, for example. The defect point is corrected using the defect point position information.

  The defect point position calculation unit 81 operates according to a defect point calibration instruction from the system control unit 19 performed via the read control unit 21, and performs an offset correction process by X-ray irradiation for defect points from the X-ray tube 12. After the offset correction by the unit 60, the position corresponding to each pixel 31 in which the signal intensity of the defect point data from the first X-ray detector 20 whose gain has been further corrected by the gain correction processing unit 70 is out of the predetermined range is determined. Calculated as defect point position information.

  The defect point position information table 82 includes a nonvolatile memory, and stores the defect point position information calculated by the defect point position calculation unit 81 as the latest position information. When the first X-ray detector 20 is detached and the second or third X-ray detectors 112 and 122 are attached to the standby apparatus body 10, the second supplied from the system control unit 19 is used. Alternatively, the defect point position information of the third X-ray detectors 112 and 122 is stored as the latest position information.

  The defect point correction unit 83 reads the latest defect point position information from the defect point position information table 82, and determines the defect point of the X-ray projection data output from the gain correction processing unit 70 based on the read defect point position information. For example, the correction is performed by replacing the average value of the data corresponding to the plurality of pixels 31 adjacent to the position sandwiching the defect point.

Next, details of the configuration of the calibration data storage device 210 will be described with reference to FIGS.
FIG. 4 is a diagram showing details of the configuration of the calibration data storage device 210. The calibration data storage device 210 includes an interface 211 that communicates with the device bodies 10, 111, and 121 of the X-ray diagnostic devices 100, 110, and 120 via the network 200, and the device body 10 that is received by the interface 211, A data storage unit 212 that stores calibration data from 111 and 121, and a data search unit 213 that searches for calibration data stored in the data storage unit 212 are provided.

  Further, when the apparatus main bodies 10, 111, 121 and the first to third X-ray detectors 20, 112, 122 are combined based on the calibration data transmitted from the apparatus main bodies 10, 111, 121. A calculation unit 214 for obtaining calibration data not calculated by calibration, an interface 211, a data storage unit 212, a data search unit 213, and a control unit 215 that controls each unit of the calculation unit 214 in an integrated manner. Yes.

  Hereinafter, an example of the operation of the calibration data storage system 300 will be described with reference to FIGS. 1 to 6.

  FIG. 5 is a diagram illustrating an example of calibration data calculated by calibration. When the X-ray diagnostic apparatuses 100, 110, and 120 are installed in a medical facility, X combinations of nine combinations of the apparatus main bodies 10, 111, and 121 and the first to third X-ray detectors 20, 112, and 122 are provided. Line photography will be performed. Of the nine combinations, the apparatus main body 10 and the standard first X-ray detector 20 that are frequently used, the apparatus main body 111, the standard second X-ray detector 112, and the apparatus main body 121 Calibration is performed by three combinations with the standard third X-ray detector 122.

  In this calibration, the apparatus main body 10 calculates an offset correction coefficient, a gain correction coefficient (A1 · B1), and defect point position information C1, which are calibration data, in combination with the first X-ray detector 20. Next, among the calculated calibration data, the gain correction coefficient (A1 · B1) and the accompanying information ID11 which is identification information for identifying the correction coefficient, the defect point position information C1 and the identification information for identifying the position information. The detector IDa1 is transmitted to the calibration data storage device 210 via the network 200.

  In addition, the apparatus main body 111 calculates an offset correction coefficient, a gain correction coefficient (A2 · B2), and defect point position information C2 in combination with the second X-ray detector 112. Then, the gain correction coefficient (A2 · B2) calculated, the incidental information ID22 including the detector IDa2 of the second X-ray detector 112 and the apparatus IDb2 of the apparatus main body 111 for identifying the correction coefficient, and the defect point position information C2 The detector IDa2 for identifying the position information is transmitted to the calibration data storage device 210 via the network 200.

  Further, the apparatus main body 121 calculates an offset correction coefficient, a gain correction coefficient (A3 / B3), and defect point position information C3 in combination with the third X-ray detector 122. Next, the calculated gain correction coefficient (A3 / B3), the incidental information ID33 including the detector IDa3 of the third X-ray detector 122 and the apparatus IDb3 of the apparatus main body 121 for identifying the correction coefficient, and the defect point position information C3 The detector IDa3 for identifying the position information is transmitted to the calibration data storage device 210 via the network 200.

  Next, of the first to third X-ray detectors 20, 112, 122, for example, the first X-ray detector 20 that is assumed to be attached to the apparatus main body 10 with high frequency, for example, and each device are assumed. Calibration by two combinations with the main bodies 111 and 121 is performed. The apparatus main body 111 calculates an offset correction coefficient and a gain correction coefficient (A1 · B2) in combination with the first X-ray detector 20. Next, the calculated gain correction coefficient (A 1 · B 2) and incidental information ID 12 including the detector IDa 1 and the device IDb 2 are transmitted to the calibration data storage device 210 via the network 200.

  Further, the apparatus main body 121 calculates a gain correction coefficient (A1 · B3) in combination with the first X-ray detector 20. Next, the calculated gain correction coefficient (A1 · B3) and incidental information ID13 including the detector IDa1 and the device IDb3 are transmitted to the calibration data storage device 210 via the network 200.

  The interface 211 of the calibration data storage device 210 receives the gain correction coefficient (A1, B1) and the incidental information ID11, the defect point position information C1, and the detector IDa1 transmitted from the apparatus main body 10 via the network 200. . Also, the gain correction coefficient (A 2 · B 2) and incidental information ID 22, defect point position information C 2 and detector IDa 2, gain correction coefficient (A 1 · B 2) and incidental information ID 12 are received from the apparatus main body 111. Furthermore, the gain correction coefficient (A3 / B3) and the incidental information ID33, the defect point position information C3 and the detector IDa3, the gain correction coefficient (A1 / B3) and the incidental information ID13 are received from the apparatus main body 121. Then, the received calibration data and identification information are output to the data storage unit 212 and the calculation unit 214.

  The data storage unit 212 stores each calibration data and identification information output from the interface 211. In addition, the calculation unit 214 obtains gain correction coefficients based on four combinations that are not calibrated out of nine patterns, based on each gain correction coefficient and identification information output from the interface 211.

  FIG. 6 is a diagram illustrating an example of calculating a gain correction coefficient by a combination that is not calibrated. In the calculation unit 214, based on the five gain correction coefficients (A1 · B1), (A2 · B2), (A3 · B3), (A1 · B2), and (A1 · B3) output from the interface 211, The apparatus main body 10 and the second and third X-ray detectors 112 and 122 that are not calibrated, the apparatus main body 111 and the third X-ray detector 122, and the apparatus main body 121 and the second X-ray detection. A gain correction coefficient when the unit 112 is combined is obtained.

  Here, the gain correction coefficient (B1 / B2) is calculated by dividing the gain correction coefficient (A1 · B1) by the gain correction coefficient (A1 · B2). Next, by multiplying the calculated gain correction coefficient (B1 / B2) by the gain correction coefficient (A2 · B2), the gain correction coefficient (A2 · B2) when the apparatus main body 10 and the second X-ray detector 112 are combined is combined. B1) is obtained. Next, the obtained gain correction coefficient (A2 · B1) and the incidental information ID21 including the device IDb1 and the detector IDa2 for identifying the gain correction coefficient are stored in the data storage unit 212.

  Further, the gain correction coefficient (B1 / B3) is calculated by dividing the gain correction coefficient (A1 · B1) by the gain correction coefficient (A1 · B3). Next, by multiplying the calculated gain correction coefficient (B1 / B3) by the gain correction coefficient (A3 · B3), the gain correction coefficient (A3 · B3) when the apparatus main body 10 and the third X-ray detector 122 are combined is combined. B1) is obtained. Next, the obtained gain correction coefficient (A3 · B1) and the incidental information ID31 including the device IDb1 and the detector IDa3 for identifying the gain correction coefficient are stored in the data storage unit 212.

  Further, a gain correction coefficient (B2 / B1) is calculated by dividing the gain correction coefficient (A2 / B2) by the obtained gain correction coefficient (A2 / B1). Next, by multiplying the calculated gain correction coefficient (B2 / B1) by the gain correction coefficient (A3 · B1), a gain correction coefficient (when the apparatus main body 111 and the third X-ray detector 122 are combined) ( A3 · B2) is obtained. Next, the obtained gain correction coefficient (A3 / B2) and the incidental information ID32 including the device IDb2 and the detector IDa3 for identifying the gain correction coefficient are stored in the data storage unit 212.

  Further, the gain correction coefficient (B3 / B2) is calculated by dividing the gain correction coefficient (A3 · B3) by the obtained gain correction coefficient (A3 · B2). Next, by multiplying the calculated gain correction coefficient (B3 / B2) by the gain correction coefficient (A2 · B2), the gain correction coefficient (A2 · B2) when the apparatus main body 121 and the second X-ray detector 112 are combined is combined. B3) is obtained. Next, the obtained gain correction coefficient (A 2 · B 3) and the incidental information ID 23 including the device IDb 3 and the detector IDa 2 for identifying the gain correction coefficient are stored in the data storage unit 212.

  In this way, the gain correction coefficients for the four combinations that are not calibrated can be obtained from the gain correction coefficients that are calculated by the calibration of the five combinations that are smaller than the nine combinations. When there are N X-ray diagnostic apparatuses, when (N × N) combinations are possible by N apparatus bodies and N X-ray detectors, (2N−1) From the gain correction coefficients calculated by the calibration of the different combinations, the gain correction coefficients by the (N × N−2N + 1) different combinations that are not calibrated can be calculated. As a result, it is possible to reduce the work burden and time for gain calibration for calculating the gain correction coefficient.

  During the inspection after installation, when the first X-ray detector 20 is detached and the second X-ray detector 112 is attached to the standby apparatus body 10, for example, the system controller 19 of the apparatus body 10 The detector IDa2 is read from the second X-ray detector 112. Then, the interface 17 is instructed to transmit the detector IDa2 and the apparatus IDb1 that request calibration data when the second X-ray detector 112 and the apparatus body 10 are combined. The interface 17 transmits the detector IDa2 and the device IDb1 to the calibration data storage device 210 via the network 200.

  The interface 211 of the calibration data storage device 210 receives the detector IDa2 and the device IDb1 from the device body 10 and outputs them to the data search unit 213. Based on the detector IDa2 and device IDb1 output from the interface 211, the data search unit 213 selects the latest defect point position information C2 having the detector IDa2 from the calibration data stored in the data storage unit 212. In addition, the latest gain correction coefficient (A2 · B1) having the detector IDa2 and the device IDb1 is searched. Then, the calibration point position information C <b> 2 and the gain correction coefficient (A <b> 2 / B <b> 1) calibration data that have been searched are output to the interface 211. The interface 211 returns each calibration data from the data search unit 213 to the apparatus main body 10 via the network 200.

  The interface 17 of the apparatus main body 10 receives each calibration data returned from the calibration data storage device 210 via the network 200. The received calibration data is output to the system control unit 19. The system control unit 19 reads each calibration data output from the interface 17 and supplies the calibration data to the correction processing unit 50 via the control unit 21.

  The gain correction coefficient table 72 of the gain correction processing section 70 in the correction processing section 50 stores the gain correction coefficients (A2 · B1) supplied from the system control section 19 via the read control section 21. Further, the defect point position information table 82 of the defect point correction processing unit 80 stores the defect point position information C <b> 2 supplied from the system control unit 19 via the read control unit 21. Further, the offset correction processing unit 60 operates in accordance with an offset calibration instruction from the system control unit 19 performed via the read control unit 21, and the offset correction coefficient is calculated from the offset data output from the second X-ray detector 112. And the calculated offset correction coefficient is stored.

  In this way, each calibration data when the respective device main bodies 10, 111, 121 and the first to third X-ray detectors 20, 112, 122 are combined is stored in the calibration data storage device 210. Therefore, when the second X-ray detector 112 other than the standard type is attached to the apparatus main body 10, the apparatus main body 10 and the second X-ray detector 112 are combined from the calibration data storage device 210. Each calibration data can be obtained. Thereby, it is possible to reduce the burden and time of the work for calibration when the second X-ray detector 112 is attached.

  When the X-ray diagnostic apparatuses 100, 110, and 120 are regularly inspected, for example, the five combinations described in FIG. 5 are calibrated. Each calibration data of the gain correction coefficient and defect point position information calculated by this calibration is transmitted to the calibration data storage device 210. The data storage unit 212 of the calibration data storage device 210 updates each calibration data calculated by calibration at the time of periodic inspection, and stores each updated calibration data as the latest calibration data.

  Based on the five combinations of gain correction coefficients calculated by the calibration during the periodic inspection, the calculation unit 214 obtains the gain correction coefficients by the four combinations shown in FIG. Then, the uncorrected gain correction coefficient stored in the data storage unit 212 is updated to the obtained gain correction coefficient, and the updated gain correction coefficient is stored as the latest gain correction coefficient.

  According to the embodiment described above, nine combinations can be performed by the apparatus main bodies 10, 111, 121 and the first to third X-ray detectors 20, 112, 122. Then, gain correction coefficients based on four combinations that are not calibrated can be obtained from gain correction coefficients calculated by calibration of five combinations that are fewer than nine combinations. As a result, it is possible to reduce the work load and time required for gain calibration.

  The first X-ray detector 20 is stored in the calibration data storage device 210 by storing each calibration data calculated by calibration and each calibration data based on a combination that has not been calibrated. When the second X-ray detector 112 is attached to and detached from the apparatus main body 10, each calibration data when the apparatus main body 10 and the second X-ray detector 112 are combined from the calibration data storage device 210 is obtained. Can be obtained. As a result, it is possible to reduce the work load and time required for calibration when the second X-ray detector 112 is replaced.

DESCRIPTION OF SYMBOLS 10, 111, 121 Apparatus main body 11 Bed 12 X-ray tube 13 High voltage generation part 14 Movement mechanism part 15 Image data generation part 16 Display part 17 Interface 18 Operation part 19 System control part 20 1st X-ray detector 21 Reading control Unit 50 correction processing unit 100, 110, 120 X-ray diagnostic device 112 second X-ray detector 122 third X-ray detector 200 network 210 calibration data storage device 300 calibration data storage system

Claims (4)

A plurality of apparatus main bodies having an X-ray tube for generating X-rays to be irradiated to a subject;
A plurality of X-ray detectors detachably attached to the apparatus body for detecting X-rays transmitted through the subject from the X-ray tube and generating X-ray projection data;
Among the plurality of apparatus main bodies, a plurality of calibration data when the apparatus main body serving as a main apparatus and the plurality of X-ray detectors are respectively combined, an apparatus main body other than the main apparatus, and the plurality of X-ray detectors a storage device for storing calibration data when a combination of one and either of,
When the X-ray detector calibration data does not exist among the plurality of X-ray detector to remove the X-ray detector mounted on the device main body is attached, the calibration data the stored A calculation unit for obtaining the corresponding calibration data,
A calibration data storage system comprising: The stored calibration data and the calibration data obtained by the calculation unit are gain correction coefficients when combining the apparatus main body and any of the plurality of X-ray detectors,
After correcting the X-ray projection data generated by the X-ray detector using the offset correction coefficient calculated from the offset data output before the X-ray projection data is generated, the gain correction coefficient is used. Correction means for correcting the gain,
The calibration data storage system according to claim 1, further comprising:   The calibration data storage system according to claim 1, wherein the storage device stores identification information for each calibration data. The identification information includes a device ID for identifying the device body and a detector ID for identifying the X-ray detector,
4. The calibration data according to claim 3, wherein the calculation unit obtains the calibration data in the case of a combination of at least one apparatus main body having no identification information and at least one detector. 5. Storage system.

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