Control apparatus, control method, and storage medium

Abstract

To provide a control device, a control method, and a control program capable of efficiently acquiring an initial value of a filament current corresponding to a large number of radiation irradiation conditions.SOLUTION: A control device that controls a filament current flowing through a filament of a radiation source acquires a plurality of sets of tube current values and filament current values corresponding to the tube current values by controlling the filament current such that the tube current values have a plurality of different values in a state in which the emission of radiation is continued and outputs the plurality of sets of tube current values and the filament current values corresponding to the tube current values so as to be associated with each other.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to a control device, a control method, and a control program. [Background technology]

[0002] Patent Document 1 discloses a technique for controlling the filament current flowing through the filament of an X-ray tube so that the tube current flows stably at a desired value. In this technique, the initial value of the filament current to be used in the next imaging is calculated based on the stable value of the filament current when the tube current flows stably and the imaging conditions at that time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-053296 Summary of the Invention [Problem to be solved by the invention]

[0004] In the technology described in Patent Document 1, radiation irradiation is started and stopped each time the radiation irradiation conditions (e.g., tube voltage and tube current) are changed, and therefore a considerable amount of time is required for the process of acquiring initial values ​​of filament current corresponding to a large number of irradiation conditions. In other words, the technology described in Patent Document 1 has room for improvement in terms of the efficiency of acquiring initial values ​​of filament current corresponding to a large number of radiation irradiation conditions.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a control device, a control method, and a control program that can efficiently obtain initial values ​​of filament current corresponding to a large number of radiation irradiation conditions. [Means for solving the problem]

[0006] The control device of the first aspect is a control device that controls a filament current flowing through a filament provided in a radiation source and includes at least one processor, and the processor controls the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation, thereby obtaining a plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values, and outputs the plurality of sets of tube current values ​​in association with the filament current values ​​corresponding to the tube current values.

[0007] In the control device of the second aspect, in the control device of the first aspect, the processor controls the filament current so that the tube current value increases or decreases from a first value to a second value.

[0008] The control device of the third aspect is the control device of the first or second aspect, wherein the processor controls the tube voltage value to a plurality of different values ​​while continuing to irradiate radiation, and acquires, for each of the plurality of tube voltage values, a plurality of sets of tube current values ​​and a filament current value corresponding to the tube current value.

[0009] A control device of a fourth aspect is a control device of any one of the first to third aspects, in which the processor acquires multiple sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​at a predetermined timing.

[0010] A fifth aspect of the control method controls a filament current flowing through a filament provided in a radiation source, and the processor of the control device, which has at least one processor, controls the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation, thereby acquiring a plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values, and performing processing to output the plurality of sets of tube current values ​​in association with the filament current values ​​corresponding to the tube current values.

[0011] A control program of a sixth aspect controls a filament current flowing through a filament provided in a radiation source, and causes a processor of a control device having at least one processor to execute a process of acquiring a plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​by controlling the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation, and outputting the plurality of sets of tube current values ​​in association with the filament current values ​​corresponding to the tube current values. [Effects of the Invention]

[0012] According to the present disclosure, initial values ​​of filament current corresponding to a large number of radiation irradiation conditions can be efficiently obtained. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic diagram illustrating an example of the configuration of a tomographic imaging system. [Figure 2] FIG. 2 is a block diagram showing an example of the configuration of a high voltage generating unit. [Figure 3] FIG. 2 is a block diagram showing an example of a hardware configuration of a console. [Figure 4] FIG. 2 is a block diagram illustrating an example of a hardware configuration of a control device. [Figure 5] FIG. 2 is a block diagram showing an example of a functional configuration of a control device. [Figure 6] 1 is a graph showing time series changes in tube voltage, tube current, and filament current. [Figure 7] FIG. 10 is a diagram showing an example of filament current data. [Figure 8] 10 is a flowchart illustrating an example of a current value acquisition process. [Figure 9] FIG. 2 is a block diagram showing an example of a functional configuration of a console. [Figure 10] 10 is a flowchart illustrating an example of a tomographic image generating process. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, examples of embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The present disclosure can also be applied to a program and a program product.

[0015] First, the configuration of a tomographic imaging system 10 will be described with reference to Fig. 1. As shown in Fig. 1, the tomographic imaging system 10 according to this embodiment includes a CT (Computed Tomography) device 11 and a console 12.

[0016] The CT device 11 obtains a tomographic image of the subject H by imaging the subject H using X-rays, which are an example of radiation. The CT device 11 includes a gantry 18 and a bed device 19. FIG. 1 is a front view of the gantry 18 and the bed device 19. The bed device 19 includes a tabletop 19A on which the subject H can be placed in a supine position. In the following description, the longitudinal direction of the tabletop 19A is defined as the Z-axis direction, the lateral direction of the tabletop 19A as the X-axis direction, and the vertical direction as the Y-axis direction. The tabletop 19A can move in the Z-axis direction while remaining horizontal. The gantry 18 has an overall annular shape and is provided at its center with a circular opening 18A having a diameter greater than the width of the tabletop 19A. During imaging, the tabletop 19A, on which the subject H is placed, moves in the Z-axis direction relative to the gantry 18 to enter the opening 18A. Imaging is performed while the tabletop 19A is moving relative to the gantry 18.

[0017] A radiation source 21, a radiation detector 22, and a frame 23 are arranged inside the gantry 18. The radiation source 21 includes a cathode 211 and an anode 212 (see FIG. 2). The radiation source 21 irradiates radiation toward the subject H. An example of the radiation source 21 is an X-ray tube. The radiation detector 22 detects the radiation that has passed through the subject H. The radiation that has passed through the subject H is attenuated by interaction with structures such as organs and bones inside the subject H (for example, absorption and scattering of the radiation). Each structure has its own unique attenuation coefficient for radiation, and the radiation that has passed through a structure carries information reflecting the physical properties of the structure. The radiation detector 22 detects the radiation that reflects the physical properties of the structures inside the subject H. The radiation detector 22 has a detection surface on which detection elements are arranged two-dimensionally, and outputs a detection signal for each detection element. Therefore, the radiation detector 22 can detect the radiation at each transmission position where it passes through the structure of the subject H. The radiation detector 22 has a substantially arcuate shape in accordance with the curvature of the gantry 18, and the detection surface is also curved.

[0018] The radiation source 21 and the radiation detector 22 are disposed in opposing positions within the gantry 18, and rotate around the Z axis while maintaining their opposing orientation. The frame 23 is annular and rotatably supports the radiation source 21 and the radiation detector 22. During imaging, the gantry 18 rotates the radiation source 21 and the radiation detector 22 around the subject H on the tabletop 19A, and acquires detection signals from the radiation detector 22 at multiple positions in the circumferential direction around the Z axis, which corresponds to the body axis of the subject H. During imaging, the tabletop 19A also moves in the Z axis direction in synchronization with the rotation of the radiation source 21 and the radiation detector 22.

[0019] The DAS (Data Acquisition System) 25 collects detection signals output by the radiation detector 22, generates output data for each position around the Z axis based on the collected detection signals, and outputs the generated output data to the console 12. When a subject H is present between the radiation source 21 and the radiation detector 22, this output data is projection data of the subject H.

[0020] An irradiation field limiter 24 (also called a collimator) that limits the radiation irradiation field is disposed ahead of the radiation source 21 in the irradiation direction. The irradiation field limiter 24 has an irradiation aperture whose outline is defined by a plurality of shielding plates that block radiation, and the size of the irradiation aperture can be changed by moving the shielding plates. The radiation source 21 and the radiation detector 22 are electrically connected to the frame 23, for example, by a slip ring system, and power supply and data transmission / reception are performed via the slip ring. The slip ring system connection enables helical scan imaging, in which the radiation source 21 and the radiation detector 22 are rotated in one direction without reversing the rotation direction.

[0021] The console 12 controls the radiation source 21 and the radiation detector 22 via a control device 13 (see FIG. 2) provided in the gantry 18. The imaging conditions of the CT device 11 are set by operations from the console 12. The imaging conditions include the radiation irradiation conditions of the radiation source 21 and the imaging range. The radiation irradiation conditions include the tube voltage (unit: kV), tube current (unit: mA), and radiation irradiation time (unit: msec) applied to the radiation source 21. The imaging range is adjusted, for example, in the XY plane by changing the size of the irradiation opening of the irradiation field limiter 24, and in the Z-axis direction by changing the movement range of the tabletop 19A.

[0022] 1, the gantry 18 also includes a control device 13 and a high-voltage generator 14. The control device 13 controls the radiation source 21 and the radiation detector 22 under the control of the console 12. The control device 13 controls the filament current flowing through the filament provided in the cathode 211 of the radiation source 21 via the high-voltage generator 14. When a tube voltage is applied between the cathode 211 and the anode 212 and a filament current flows through the filament, a tube current flows between the cathode 211 and the anode 212. This causes radiation to be emitted from the anode 212.

[0023] As shown in FIG. 2, the high voltage generation unit 14 includes a commercial AC power supply 141, a high voltage supply unit 142, a filament voltage supply unit 143, a tube voltage detection unit 144, a tube current detection unit 145, and a filament current detection unit 146.

[0024] The high voltage supply unit 142 generates a voltage from a commercial AC power supply 141 and applies it as a tube voltage between the cathode 211 and the anode 212. The filament voltage supply unit 143 passes a filament current through a filament provided in the cathode 211 based on the AC power supply 141. The tube voltage detection unit 144 detects the value of the tube voltage applied by the high voltage supply unit 142 and outputs it to the control device 13. The tube current detection unit 145 detects the value of the tube current and outputs it to the control device 13. The filament current detection unit 146 detects the value of the filament current and outputs it to the control device 13.

[0025] The hardware configuration of the console 12 according to this embodiment will be described with reference to Fig. 3. Examples of the console 12 include a computer such as a personal computer or a server computer. As shown in Fig. 3, the console 12 includes a CPU (Central Processing Unit) 31, a memory 32 as a temporary storage area, and a non-volatile storage unit 33. The console 12 also includes a display 34 such as a liquid crystal display, an input device 35 such as a keyboard and a mouse, and a network I / F (Interface) 36 connected to the CT device 11. The CPU 31, the memory 32, the storage unit 33, the display 34, the input device 35, and the network I / F 36 are connected to a bus 37.

[0026] The storage unit 33 is realized by a hard disk drive (HDD), a solid state drive (SSD), a flash memory, or the like. The storage unit 33 serving as a storage medium stores an information processing program 40. The CPU 31 reads the information processing program 40 from the storage unit 33, expands it in the memory 32, and executes the expanded information processing program 40.

[0027] The storage unit 33 also stores filament current data 42. The filament current data 42 is data in which a filament current value is associated with each of a plurality of tube current values. The filament current data 42 is obtained by the control device 13, which will be described later.

[0028] The hardware configuration of the control device 13 according to this embodiment will be described with reference to Fig. 4. An example of the control device 13 is a computer. As shown in Fig. 4, the control device 13 includes a CPU 51, a memory 52 as a temporary storage area, and a non-volatile storage unit 53. The control device 13 also includes a network I / F 56 connected to the console 12. The CPU 51, the memory 52, the storage unit 53, and the network I / F 56 are connected to a bus 57. The CPU 51 is an example of a processor according to the disclosed technology.

[0029] The storage unit 53 is realized by an HDD, an SSD, a flash memory, or the like. The storage unit 53 serving as a storage medium stores a control program 60. The CPU 51 reads the control program 60 from the storage unit 53, loads it into the memory 52, and executes the loaded control program 60.

[0030] Next, the functional configuration of the control device 13 will be described with reference to Fig. 5. As shown in Fig. 5, the control device 13 includes a radiation control unit 70, an acquisition unit 72, and an output unit 74. The CPU 51 executes the control program 60 to function as the radiation control unit 70, the acquisition unit 72, and the output unit 74.

[0031] The radiation control unit 70 controls the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation. In this embodiment, the radiation control unit 70 controls the filament current so that the tube current value decreases from a first value to a second value that is smaller than the first value. The radiation control unit 70 also controls the tube voltage value to a plurality of different values ​​while continuing to irradiate radiation, and controls the filament current so that the tube current value becomes a plurality of different values ​​at each of the plurality of tube voltage values.

[0032] A specific example of control by the radiation control unit 70 will be described with reference to Fig. 6. The horizontal axis of Fig. 6 represents time, and the vertical axis represents the filament current value, the tube current value, and the tube voltage value. In Fig. 6, the solid line L1 represents the time series progression of the filament current, the dashed-dotted line L2 represents the time series progression of the tube voltage, and the dashed-two-dotted line L3 represents the time series progression of the tube current. In Fig. 6, A1 represents the first value, and A2 represents the second value.

[0033] As shown in Fig. 6, first, at time t0, the radiation control unit 70 controls the filament voltage supply unit 143 to pass a filament current through the filament provided in the cathode 211. Next, at time t1, the radiation control unit 70 controls the high voltage supply unit 142 to apply a tube voltage of a predetermined tube voltage value. This causes the tube current to start flowing. The period from time t0 to time t1 is a period during which the filament waits to be heated.

[0034] Next, the radiation control unit 70 controls the filament current by controlling the filament voltage supply unit 143 so that the tube current value detected by the tube current detection unit 145 becomes a first value A1. The radiation control unit 70 also controls the filament current by controlling the filament voltage supply unit 143 so that the tube current value detected by the tube current detection unit 145 decreases from the first value A1 to a second value A2 that is smaller than the first value A1 by a predetermined decrease. Time point t2 is the time point at which the tube current value becomes the second value A2. The radiation control unit 70 repeatedly performs the same control from time point t1 to time point t2 while continuing to irradiate radiation, changing the tube voltage value to a plurality of different values.

[0035] Then, after performing control from time t1 to time t2 at each of the multiple tube voltage values, the radiation control unit 70 controls the filament voltage supply unit 143 at time t2 to stop the flow of the filament current, and controls the high voltage supply unit 142 to stop the application of the tube voltage, thereby ending the irradiation of radiation.

[0036] For example, the first value A1 is set to the upper limit of the tube current value that can be set in the CT device 11, and the second value A2 is set to the lower limit of the tube current value that can be set in the CT device 11. Also, for example, the decrease in the tube current value from the first value A1 to the second value A2 is set to a value such as 1 [mA]. ​​Also, for example, the multiple tube voltage values ​​are set to values ​​that may be used in examinations in the hospital where the CT device 11 is installed.

[0037] The radiation control unit 70 may control the filament current so that the tube current value increases from a first value to a second value that is greater than the first value.

[0038] The acquisition unit 72 acquires multiple sets of tube current values ​​when the tube current value decreases by a predetermined decrease width from the first value A1 to the second value A2 under the control of the radiation control unit 70, and the filament current values ​​corresponding to the tube current values ​​detected by the filament current detection unit 146. The multiple sets of tube current values ​​may include the first value A1 and the second value A2.

[0039] In the present embodiment, the acquisition unit 72 acquires, at a predetermined timing, a plurality of sets of tube current values ​​and filament current values ​​corresponding to the respective tube current values, for each of a plurality of tube voltage values. Examples of the predetermined timing in this case include the timing when an execution instruction is input by a maintenance technician during a periodic inspection or the like, the timing when air calibration is performed, or a regular timing such as once a day. Air calibration means acquiring calibration data in a state where neither the subject H nor an object such as a phantom is present between the radiation source 21 and the radiation detector 22.

[0040] The output unit 74 associates multiple sets of tube current values ​​for each of the multiple tube voltage values ​​acquired by the acquisition unit 72 with filament current values ​​corresponding to the tube current values, and outputs (i.e., transmits) the associated sets of tube current values ​​to the console 12. Note that the output unit 74 may also associate multiple sets of tube current values ​​for each of the multiple tube voltage values ​​acquired by the acquisition unit 72 with filament current values ​​corresponding to the tube current values, and output (i.e., store) the associated sets of tube current values ​​to the storage unit 53.

[0041] The CPU 31 of the console 12 acquires multiple sets of tube current values ​​for each of the multiple tube voltage values ​​output from the output unit 74 and the filament current values ​​corresponding to the tube current values, and stores them in the storage unit 33 as filament current data 42. Fig. 7 shows an example of the filament current data 42. As shown in Fig. 7, in the filament current data 42, a filament current value is associated with each of the multiple tube current values ​​for each of the multiple tube voltage values.

[0042] Next, the operation of the control device 13 will be described with reference to Fig. 8. The CPU 51 executes the control program 60 to perform the current value acquisition process shown in Fig. 8. The current value acquisition process is performed at the predetermined timing described above.

[0043] 8, the radiation control unit 70 controls the filament voltage supply unit 143 to pass a filament current through the filament included in the cathode 211. In step S12, the radiation control unit 70 controls the high voltage supply unit 142 to apply a tube voltage of a predetermined tube voltage value. When step S12 is repeatedly executed, a tube voltage of a tube voltage value different from the tube voltage value applied up to that point is applied.

[0044] In step S14, the radiation control unit 70 controls the filament current by controlling the filament voltage supply unit 143 so that the tube current value detected by the tube current detection unit 145 becomes a first value A1. Furthermore, the radiation control unit 70 controls the filament current by controlling the filament voltage supply unit 143 so that the tube current value detected by the tube current detection unit 145 decreases from the first value A1 to a second value A2 smaller than the first value A1 by a predetermined decrease amount.

[0045] In step S16, the acquisition unit 72 acquires multiple sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​during the period in which the tube current value decreased by a predetermined amount from the first value A1 to the second value A2 under the control of step S14. In step S18, the radiation control unit 70 determines whether the processes from step S12 to step S16 have been executed for each of the multiple tube voltage values. If this determination is negative, the process returns to step S12; if this determination is positive, the process proceeds to step S20.

[0046] In step S20, the radiation control unit 70 controls the filament voltage supply unit 143 to terminate the flow of filament current, and controls the high voltage supply unit 142 to terminate the application of tube voltage. This terminates the irradiation of radiation. In step S22, the output unit 74 associates multiple sets of tube current values ​​for each of the multiple tube voltage values ​​acquired in step S16 with the filament current values ​​corresponding to the tube current values, and outputs these to the console 12. When the processing of step S22 ends, the current value acquisition processing ends.

[0047] Next, the functional configuration of the console 12 will be described with reference to Fig. 9. As shown in Fig. 9, the console 12 includes an imaging control unit 80, an acquisition unit 82, and a reconstruction unit 84. The CPU 31 executes the information processing program 40 to function as the imaging control unit 80, the acquisition unit 82, and the reconstruction unit 84.

[0048] The imaging control unit 80 controls the imaging of a radiographic image of the subject H according to imaging conditions specified by a technician or the like. Specifically, the imaging control unit 80 acquires a filament current value corresponding to a combination of a tube voltage value and a tube current value included in the specified imaging conditions from the filament current data 42. Next, the imaging control unit 80 controls the filament voltage supply unit 143 to cause a filament current of the acquired filament current value to flow through the filament provided in the cathode 211.

[0049] Furthermore, after the filament heating period has elapsed, the imaging control unit 80 applies a tube voltage of a tube voltage value included in the imaging conditions by controlling the high voltage supply unit 142. Furthermore, the imaging control unit 80 controls the filament voltage supply unit 143 to control the filament current so that the tube current value detected by the tube current detection unit 145 becomes a tube current value included in the imaging conditions. Then, when scanning of the subject H is completed, the imaging control unit 80 controls the filament voltage supply unit 143 to stop the flow of the filament current, and controls the high voltage supply unit 142 to stop the application of the tube voltage.

[0050] The acquisition unit 82 acquires projection data obtained under the control of the imaging control unit 80 from the DAS 25. The reconstruction unit 84 generates a tomographic image by reconstructing the tomographic image based on the projection data acquired by the acquisition unit 82. The reconstruction of the tomographic image based on the projection data is performed by, for example, filtered back projection.

[0051] Next, the operation of the console 12 will be described with reference to Fig. 10. The CPU 31 executes the information processing program 40, thereby executing the tomographic image generation process shown in Fig. 10. The tomographic image generation process is executed when an instruction to start execution is input by the technician.

[0052] 10, the imaging control unit 80 controls imaging of a radiographic image of the subject H in accordance with the imaging conditions, as described above. In step S32, the acquisition unit 82 acquires the projection data obtained by the control in step S30 from the DAS 25. In step S34, the reconstruction unit 84 generates a tomographic image by reconstructing the tomographic image based on the projection data acquired in step S32. When the processing of step S34 ends, the tomographic image generation processing ends.

[0053] As described above, according to this embodiment, multiple sets of tube current values ​​and corresponding filament current values ​​are acquired while radiation irradiation is continuing, without repeatedly starting and ending radiation irradiation, thereby making it possible to efficiently acquire initial values ​​of filament currents corresponding to a large number of radiation irradiation conditions.

[0054] It should be noted that the console 12 may include at least one of the functional units included in the control device 13 in the above embodiment.

[0055] In the above embodiment, a CT scanner is used as a radiographic imaging device that controls the tube current by controlling the filament current, but the disclosed technology is not limited to this. For example, a radiographic imaging device including a cassette-type radiation detector may be used as a radiographic imaging device that controls the tube current by controlling the filament current. In the above embodiment, an example is described in which the cathode 211 of the radiation source 21 includes a filament, but the cathode 211 may include a field electron emission source such as a carbon nanotube.

[0056] Furthermore, in the above embodiment, the following various processors can be used as the hardware structure of a processing unit that executes various processes, such as the functional units of the console 12 and the control device 13. As described above, the various processors include a CPU, which is a general-purpose processor that executes software (programs) and functions as various processing units, as well as dedicated electrical circuits, such as a programmable logic device (PLD), a processor whose circuit configuration can be changed after manufacture, such as an FPGA, and an application specific integrated circuit (ASIC), which is a processor with a circuit configuration designed specifically for executing specific processes.

[0057] A single processing unit may be configured with one of these various processors, or may be configured with a combination of two or more processors of the same or different types (for example, a combination of multiple FPGAs, or a combination of a CPU and an FPGA). Also, multiple processing units may be configured with a single processor.

[0058] Examples of configuring multiple processing units with a single processor include, first, a form in which one processor is configured with a combination of one or more CPUs and software, and this processor functions as multiple processing units, as typified by computers such as client and server. Second, a form in which a processor is used to realize the functions of the entire system including multiple processing units with a single IC (Integrated Circuit) chip, as typified by systems on chips (SoCs). In this way, various processing units are configured using one or more of the above-mentioned various processors as a hardware structure.

[0059] Furthermore, more specifically, the hardware structure of these various processors can be an electric circuit that combines circuit elements such as semiconductor elements.

[0060] In the above embodiment, the information processing program 40 is pre-stored (installed) in the storage unit 33, but the disclosed technology is not limited to this. The information processing program 40 may be provided in a form recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), or a USB (Universal Serial Bus) memory. The information processing program 40 may also be downloaded from an external device via a network.

[0061] In the above embodiment, the control program 60 is pre-stored (installed) in the storage unit 53, but the disclosed technology is not limited to this. The control program 60 may be provided in a form recorded on a recording medium such as a CD-ROM, a DVD-ROM, or a USB memory. The control program 60 may also be downloaded from an external device via a network. [Explanation of symbols]

[0062] 10 Tomography system 11 CT device 12 Console 13 Control device 14 High voltage generator 18 Gantry 18A opening 19 Bed Device 19A Top plate 21 Radiation source 22 Radiation detector 23 frames 24 Irradiation field limiter 25 DAS 31, 51 CPU 32, 52 memory 33, 53 Storage section 34 Display 35 Input Devices 36, 56 Network I / F Buses 37 and 57 40 Information Processing Program 42 Filament current data 60 Control Program 70 Radiation Control Department 72, 82 Acquisition Department 74 Output section 80 Shooting control unit 84 Reconstruction section 141 AC power supply 142 High voltage supply unit 143 Filament voltage supply unit 144 Tube voltage detection unit 145 Tube current detection unit 146 Filament current detection unit 211 Cathode 212 Anode H Subject

Claims

1. A control device that controls a filament current flowing through a filament included in a radiation source and includes at least one processor, The processor: By controlling the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation, a plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​are obtained; The plurality of sets of tube current values ​​are output in association with the filament current values ​​corresponding to the tube current values. Control device.

2. The processor: The filament current is controlled so that the tube current value increases or decreases from a first value to a second value. The control device according to claim 1 .

3. The processor: The tube voltage value is controlled to a plurality of different values ​​while continuing the irradiation of the radiation, and the plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​are acquired for each of the plurality of tube voltage values. The control device according to claim 1 or 2.

4. The processor: At a predetermined timing, the plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​are acquired. The control device according to claim 1 or 2.

5. a control device that controls a filament current flowing through a filament included in a radiation source and that includes at least one processor, By controlling the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation, a plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​are obtained; The plurality of sets of tube current values ​​are output in association with the filament current values ​​corresponding to the tube current values. A control method for performing a process.

6. A control device controls a filament current flowing through a filament included in a radiation source, and the control device includes at least one processor, By controlling the filament current so that the tube current value becomes a plurality of different values ​​while continuing to irradiate radiation, a plurality of sets of tube current values ​​and filament current values ​​corresponding to the tube current values ​​are obtained; The plurality of sets of tube current values ​​are output in association with the filament current values ​​corresponding to the tube current values. A control program for executing processing.

Images