X-ray fluoroscopy imaging apparatus

Abstract

The present x-ray fluoroscopic imaging apparatus (100) has a control section (6) that performs control to cause an x-ray irradiation section (21) to irradiate x-rays based on an input operation by an operation section (3), and performs control to generate an x-ray image, the control section (6) being configured to, in a case where a pixel value of a pixel included in the generated x-ray image is included in a range of a target pixel value (58), cause the x-ray irradiation section (21) to stop irradiation of x-rays even if an input operation to cause x-rays to be irradiated is continuously received by the operation section (3).

Description

Technical Field

[0001] This invention relates to an X-ray fluoroscopic imaging device. Background Technology

[0002] Previously, an X-ray fluoroscopic imaging device was known for performing fluoroscopic imaging of a subject using X-rays. Such an X-ray imaging device is disclosed, for example, in International Publication No. 2018 / 025347.

[0003] International Publication No. 2018 / 025347 discloses that, in an X-ray fluoroscopy imaging apparatus, when X-ray fluoroscopy of a subject begins, in order to display an X-ray image with appropriate brightness, the X-ray irradiation conditions are changed so that the brightness value (pixel value) of the X-ray image becomes an ideal brightness value (target pixel value). This X-ray fluoroscopy imaging apparatus performs the aforementioned automatic adjustment of the X-ray irradiation conditions for X-ray images intermittently generated through X-ray fluoroscopy.

[0004] Existing technical documents Patent documents Patent Document 1: International Publication No. 2018 / 025347 Summary of the Invention The technical problem that the invention aims to solve Although not described in the aforementioned International Publication No. 2018 / 025347, a typical X-ray fluoroscopy imaging device includes, for example, a foot switch for X-ray fluoroscopy. When the foot switch is pressed, X-ray fluoroscopy begins by irradiating the X-ray irradiation unit with X-rays. Furthermore, when the foot is removed from the pressed foot switch, the irradiation of the X-ray irradiation unit with X-rays stops, thereby ending the X-ray fluoroscopy.

[0005] In the X-ray fluoroscopy imaging apparatus disclosed in International Publication No. 2018 / 025347, when the time for pressing the X-ray fluoroscopy foot switch (operation unit) is shortened to reduce the radiation dose, the brightness value (pixel value) of the X-ray image generated based on the changed X-ray irradiation conditions may not converge to the ideal brightness value (target pixel value), thus failing to obtain an X-ray image with improved visibility. Conversely, when the time for pressing the X-ray fluoroscopy foot switch is extended to reliably obtain an X-ray image with improved visibility, the radiation dose to the subject may increase due to the increased X-ray irradiation time. Therefore, it is desirable to obtain an X-ray image with improved visibility while suppressing the increase in the subject's radiation dose.

[0006] The present invention was made to solve the above-mentioned technical problems. One of the objectives of the present invention is to provide an X-ray fluoroscopic imaging device that can obtain X-ray images with improved visibility while suppressing the increase of radiation dose to the subject.

[0007] Solution to the above technical problems An X-ray fluoroscopic imaging apparatus according to one aspect of the present invention includes: an X-ray irradiation unit for irradiating X-rays; an X-ray detection unit for detecting X-rays irradiated by the X-ray irradiation unit; an operation unit for receiving input operations related to X-ray irradiation performed using the X-ray irradiation unit; and a control unit for controlling the X-ray irradiation unit to irradiate X-rays based on the input operations of the operation unit and for controlling the generation of an X-ray image based on a detection signal output from the X-ray detection unit. The control unit is configured to stop the X-ray irradiation unit from irradiating X-rays even when the pixel values ​​of the pixels included in the generated X-ray image are within the range of target pixel values, even if the input operations for X-ray irradiation are continuously received through the operation unit.

[0008] Invention Effects In the X-ray fluoroscopic imaging apparatus described above, the control unit is configured such that, even if an input operation to irradiate with X-rays is continuously received via the operation unit, the X-ray irradiation unit stops irradiating with X-rays when the pixel values ​​of the pixels contained in the generated X-ray image are within the range of target pixel values. Thus, even if an input operation to irradiate with X-rays is continuously received, X-ray irradiation by the X-ray irradiation unit will stop when the pixel values ​​of the pixels contained in the generated X-ray image are within the range of target pixel values. Therefore, it is possible to suppress the reception of input operations that cancel X-ray irradiation before the pixel values ​​are within the range of target pixel values ​​due to concerns about increased radiation dose to the subject, and it is also possible to suppress the increase in X-ray irradiation time caused by continuously receiving input operations that irradiate with X-rays when the pixel values ​​are within the range of target pixel values. Furthermore, when X-ray irradiation is stopped by the control unit, the visibility of the generated X-ray image is improved because the pixel values ​​of the pixels contained in the generated X-ray image are within the range of target pixel values. For these reasons, it is possible to obtain an X-ray image with improved visibility while suppressing an increase in radiation dose to the subject. Attached Figure Description

[0009] [ Figure 1 [ ] is a block diagram showing the configuration of the X-ray fluoroscopic imaging apparatus according to the first embodiment.

[0010] [ Figure 2 [ ] is a schematic diagram of the X-ray fluoroscopic imaging apparatus of the first embodiment.

[0011] [ Figure 3 [ ] is a schematic diagram of the foot switch and operation panel of the X-ray fluoroscopic imaging device according to the first embodiment.

[0012] [ Figure 4[ ] is a schematic diagram of the display section of the X-ray fluoroscopic imaging apparatus according to the first embodiment.

[0013] [ Figure 5 [Illustration 1] is a diagram showing an example of the APR of the first embodiment.

[0014] [ Figure 6 [ ] is a sequence diagram for explaining the feedback control of the first operation unit using the first embodiment.

[0015] [ Figure 7 [ ] is a sequence diagram for explaining the feedback control of the second operation unit using the first embodiment.

[0016] [ Figure 8 [ ] is a first flowchart for explaining the pixel value adjustment processing and X-ray image display processing of the first embodiment.

[0017] [ Figure 9 [ ] is a second flowchart for explaining the pixel value adjustment process and X-ray image display process of the first embodiment.

[0018] [ Figure 10 [ ] is a block diagram showing the configuration of the X-ray fluoroscopic imaging apparatus according to the second embodiment.

[0019] [ Figure 11 [ ] is a schematic diagram of the foot switch and operation panel of the X-ray fluoroscopic imaging device according to the second embodiment.

[0020] [ Figure 12 [ ] is a third flowchart for illustrating the pixel value adjustment process and X-ray image display process of the second embodiment.

[0021] [ Figure 13 This is the fourth flowchart used to explain the pixel value adjustment processing and X-ray image display processing of the second embodiment. Detailed Implementation

[0022] [First Implementation] (Composition of an X-ray fluoroscopic imaging device) Reference Figures 1-5 The configuration of the X-ray fluoroscopic imaging apparatus 100 of the first embodiment will be described.

[0023] X-ray fluoroscopic imaging device 100 is an X-ray fluoroscopic imaging device used by surgeons or others to perform X-ray imaging during surgery. For example... Figure 1 and Figure 2As shown, the X-ray fluoroscopic imaging apparatus 100 includes a main body 1 and a monitor trolley 4. The X-ray fluoroscopic imaging apparatus 100 is configured to be entirely movable, allowing it to be moved to the patient's side in the operating room for X-ray imaging during surgery by doctors or other personnel. Furthermore, X-ray imaging includes fluoroscopic imaging, which images X-ray images as dynamic images, and general imaging, which images X-ray images as static images. Additionally, X-ray images include X-ray perspective views and general X-ray images.

[0024] like Figure 1 As shown, the main body 1 of the device includes an X-ray imaging unit 2, an operation unit 3, a storage unit 5, a control unit 6, and a moving mechanism unit 7 (see reference). Figure 2 ) and arm 8 (refer to) Figure 2 The X-ray imaging unit 2 includes an X-ray irradiation unit 21 and an X-ray detection unit 22. Furthermore, the monitor trolley unit 4 includes a display unit 4a.

[0025] When the X-ray fluoroscopic imaging device 100 images the subject, at the arm 8 (refer to...) Figure 2 The patient (not shown) is placed on the inside of the bed, and a top plate (not shown) is placed on top of the bed where the patient is being used, such as in an operating room.

[0026] like Figure 1 As shown, the X-ray irradiation unit 21 is configured to generate X-rays by applying a high voltage and to irradiate the X-ray detection unit 22 with the generated X-rays. The X-ray irradiation unit 21 includes, for example, an X-ray tube as an X-ray source and a collimator for adjusting the irradiation range of the X-rays generated by the X-ray tube.

[0027] The X-ray detection unit 22 is configured to detect X-rays irradiated by the X-ray irradiation unit 21. The X-ray detection unit 22 may include, for example, an FPD (Flat Panel Detector). The X-ray detection unit 22 sends an electrical signal corresponding to the detected X-rays, i.e., a detection signal, to the image processing unit 61, which will be described later. Alternatively, the X-ray detection unit 22 may include an image intensifier (II) instead of an FPD.

[0028] The operation unit 3 is configured to receive input operations related to X-ray irradiation performed by the X-ray irradiation unit 21. The operation unit 3 includes a first operation unit 3a and a second operation unit 3b for performing fluoroscopic imaging. When the first operation unit 3a receives an input operation to perform X-ray irradiation, and the pixel value of the generated X-ray image is included in the target pixel value 58 (see reference...), Figure 5When the value of the X-ray image is within the range of the target pixel value 58, the X-ray irradiation performed by the X-ray irradiation unit 21 will stop even if an input operation is continuously received. Furthermore, when an input operation to perform X-ray irradiation is received through the second operation unit 3b, the X-ray irradiation performed by the X-ray irradiation unit 21 will not stop even if the pixel value of the generated X-ray image is within the range of the target pixel value 58.

[0029] Operating unit 3 includes a foot switch 70 (see reference) Figure 3 (a) and operation panel 33 (see reference) Figure 3 (b)

[0030] like Figure 3 As shown in (a), the foot switch 70 includes: a first foot switch 71 serving as a first operation unit 3a for fluoroscopic imaging; a second foot switch 72 serving as a second operation unit 3b for fluoroscopic imaging; and a third foot switch 73 for general imaging. The foot switch 70 is configured to receive input operations related to the start and end of X-ray irradiation performed by the X-ray irradiation unit 21. When the first foot switch 71 or the second foot switch 72 is pressed, X-ray fluoroscopy begins by irradiating X-rays from the X-ray irradiation unit 21. Furthermore, when the foot is removed from the pressed first foot switch 71 or the second foot switch 72, X-ray irradiation from the X-ray irradiation unit 21 stops, thereby ending the X-ray fluoroscopy. During the period when the first foot switch 71 or the second foot switch 72 is pressed, X-ray fluoroscopy continues, and X-ray images acquired at a predetermined frame rate are displayed as dynamic images on the display unit 4a. Furthermore, when receiving an input operation to irradiate with X-rays via the first foot switch 71, the pixel value of the generated X-ray image is included in the target pixel value 58 (see reference). Figure 5 When the input operation is continuously received within the specified range, X-ray irradiation performed by the X-ray irradiation unit 21 will be stopped. Furthermore, when the third foot switch 73 is pressed, general imaging is performed by irradiating X-rays from the X-ray irradiation unit 21. The foot switch 70 is connected to the main body of the device via cable 70a.

[0031] like Figure 3 As shown in (b), the operation panel 33 is provided with multiple input sections 33a for receiving input operations related to X-ray irradiation. The input sections 33a include an X-ray fluoroscopy button 36a and a target pixel value change button 37. Furthermore, the operation panel 33 can also be configured as a touch panel-type liquid crystal display, functioning as an input section for various operations. The operation panel 33 is provided in the movement mechanism section 7 (see reference 7). Figure 2 )superior.

[0032] The X-ray fluoroscopy button 36a includes a first X-ray fluoroscopy button 34 as a first operation unit 3a and a second X-ray fluoroscopy button 35 as a second operation unit 3b. The X-ray fluoroscopy button 36a is configured to receive input operations related to the start and end of X-ray irradiation performed by the X-ray irradiation unit 21. When the X-ray fluoroscopy button 36a is pressed, X-rays are irradiated from the X-ray irradiation unit 21, thereby starting X-ray fluoroscopy. Furthermore, when the X-ray fluoroscopy button 36a is released, X-ray irradiation from the X-ray irradiation unit 21 stops, thereby ending X-ray fluoroscopy. During the pressing of the X-ray fluoroscopy button 36a, X-ray fluoroscopy continues, and X-ray images acquired at a predetermined frame rate are displayed as dynamic images on the display unit 4a. Furthermore, when the input operation to irradiate with X-rays is received via the first X-ray fluoroscopy button 34, if the pixel value of the generated X-ray image includes the target pixel value 58 (see reference...). Figure 5 When the range is within the range, even if input operations are continuously received, the X-ray irradiation performed by the X-ray irradiation unit 21 will stop.

[0033] The target pixel value change button 37 is configured to receive input operations related to changes in the target pixel value 58 set later. The target pixel value change button 37 includes: a plus button 37a that progressively increases the brightness level of the generated X-ray image based on the brightness level of the X-ray image corresponding to the set target pixel value 58; and a minus button 37b that progressively decreases the brightness level of the generated X-ray image.

[0034] That is, based on the operation of the plus button 37a, the target pixel value 58 is changed by increasing it. This change in increasing the target pixel value 58 is included in the set X-ray irradiation condition 54 (see reference). Figure 5 The tube voltage 55 or tube current 56 in the X-ray image increases. As a result, the brightness level of the generated X-ray image increases, and the radiation dose to the subject increases.

[0035] Furthermore, based on the operation of the minus button 37b, the target pixel value 58 is changed by decreasing it. This change in decreasing the target pixel value 58 is included in the set X-ray irradiation condition 54 (see reference). Figure 5 The tube voltage 55 or tube current 56 in the X-ray image is reduced. As a result, the brightness level of the generated X-ray image decreases, and the radiation dose to the subject is reduced.

[0036] like Figure 1As shown, the storage unit 5 includes ROM (Read Only Memory) or RAM (Random Access Memory), etc. Various programs executed by the processor are stored in the storage unit 5. Furthermore, X-ray images generated at a predetermined frame rate are stored in the storage unit 5. The X-ray images stored in the storage unit 5 include multiple frames generated from the start to the end of X-ray fluoroscopy. The generated X-ray images are configured to be stored as still images or moving images.

[0037] In addition, such as Figure 5 As shown, the storage unit 5 stores an APR (Anatomic Program) 50. The APR 50 is a program that correlates the image acquisition conditions 52 with the site information 51. The site information 51 is information about the imaging sites of the subject being irradiated by X-rays; examples include the head and neck, chest, abdomen, hip joint, shoulder, knee, and foot. The image acquisition conditions 52 are a series of conditions for acquiring X-ray images, including X-ray irradiation conditions 54 and image processing conditions 53.

[0038] X-ray irradiation condition 54 pertains to various parameters related to X-ray irradiation. Examples of X-ray irradiation parameters include the tube voltage 55 and tube current 56 applied to the X-ray tube. Image processing condition 53 pertains to parameters related to image processing of the detection signal, which is an electrical signal, transmitted by the X-ray detection unit 22. Examples include contrast processing values, sharpening processing values, and edge processing values. Furthermore, image processing condition 53 includes a frame rate 57.

[0039] The control unit 6 is composed of processors such as CPU (Central Processing Unit), GPU (Graphics Processing Unit), FPGA (Field-Programmable Gate Array), and ASIC (Application Specific Integrated Circuit). As a hardware component, the control unit 6 functions as a software (program) module, including an image processing unit 61, an imaging control unit 60, and a display control unit 62. The control unit 6 executes the program stored in the storage unit 5, thus functioning as the image processing unit 61, the imaging control unit 60, and the display control unit 62. Alternatively, the image processing unit 61, the imaging control unit 60, and the display control unit 62 can be configured separately in hardware using dedicated processors (processing circuits).

[0040] The image processing unit 61 is configured to generate X-ray images based on the detection signal output from the X-ray detection unit 22. The image processing unit 61 is configured to generate X-ray images sequentially. The image processing unit 61 is configured to generate X-ray images of the interior of the subject sequentially at a predetermined frame rate (e.g., a few fps to about ten fps).

[0041] Furthermore, the image processing unit 61 is configured to obtain the pixel value of each pixel contained in the generated X-ray image. Additionally, the image processing unit 61 is configured to obtain the pixel value of a specific region 59 (see reference 59) contained in the generated X-ray image. Figure 5 The average, maximum, and minimum pixel values ​​of each pixel in ) . Specific region 59 is a pre-defined region in each part of the subject to be irradiated by X-rays, and is included in APR50 (refer to Figure 5 The information in the document is as follows. Furthermore, in the first embodiment, the generated X-ray image, for example, is image data with 4096 levels (12 bits) of pixel values ​​ranging from 0 to 4095. Pixels with the lowest level of 0 are displayed as black, and pixels with the highest level of 4095 are displayed as white.

[0042] The imaging control unit 60 is configured to control the X-ray irradiation unit 21 to irradiate X-rays based on the input operation of the operation unit 3. The imaging control unit 60 is configured such that the pixel values ​​of the pixels included in the X-ray image generated by the image processing unit 61 are included in the target pixel value 58 (see reference). Figure 5 Even if the input operation to irradiate with X-rays is continuously received through the first operation unit 3a, the X-ray irradiation unit 21 will stop irradiating with X-rays if the X-ray irradiation unit 21 stops irradiating with X-rays within the range of 0.

[0043] Furthermore, the imaging control unit 60 is configured such that the pixel values ​​of the X-ray image generated by the image processing unit 61 are not included in the target pixel value 58 (see reference). Figure 5 In order to adjust the pixel values ​​of the pixels contained in the X-ray image, the set X-ray irradiation conditions 54 are changed and the X-ray irradiation unit 21 is irradiated with X-rays.

[0044] Specifically, the imaging control unit 60 acquires the difference between the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 obtained by the image processing unit 61 and the average, maximum, and minimum pixel values ​​in the target pixel value 58. Based on the acquired difference, the imaging control unit 60 changes the set X-ray irradiation conditions 54 and irradiates the X-ray irradiation unit 21 with X-rays. For example, the imaging control unit 60 performs feedback control to adjust the tube voltage or tube current supplied to the X-ray tube in a manner that makes the acquired difference approach zero and irradiates the X-ray irradiation unit 21 with X-rays.

[0045] Alternatively, the imaging control unit 60 acquires the average, maximum, and minimum values ​​of the pixel values ​​in the target pixel value 58, and their proportions relative to the average, maximum, and minimum values ​​of the pixel values ​​in the specific region 59 acquired by the image processing unit 61. Based on the acquired proportions, the imaging control unit 60 changes the set X-ray irradiation conditions 54 and irradiates the X-ray irradiation unit 21 with X-rays. For example, the imaging control unit 60 performs feedback control to adjust the tube voltage or tube current supplied to the X-ray tube in a manner that makes the acquired proportions tend to 1, and then irradiates the X-ray irradiation unit 21 with X-rays.

[0046] Furthermore, the imaging control unit 60 is configured to stop the X-ray irradiation unit 21 from irradiating with X-rays even if the pixel value of the X-ray image generated by the image processing unit 61 based on the changed X-ray irradiation conditions 54 is within the range of the target pixel value 58, even if the input operation to irradiate with X-rays is continuously received through the first operation unit 3a.

[0047] Furthermore, the imaging control unit 60 is configured such that, even if the pixel values ​​in the set plurality of X-ray images are within the range of the target pixel value 58, the X-ray irradiation unit 21 will stop irradiating with X-rays even if the input operation to irradiate with X-rays is continuously received through the first operation unit 3a.

[0048] As an example, the imaging control unit 60 is configured to stop the X-ray irradiation unit 21 from irradiating X-rays even if the pixel values ​​in five consecutive X-ray images are within the range of the target pixel value 58, even if the input operation to irradiate X-rays is continuously received through the first operation unit 3a. Furthermore, the set multiple X-ray images are not limited to five consecutive frames. For example, they could be two to four consecutive frames, or six or more consecutive frames. Furthermore, they could also be non-consecutive multiple X-ray images. In addition, in the first embodiment, the imaging control unit 60 irradiates X-rays by the X-ray irradiation unit 21 without changing the X-ray irradiation conditions 54 until the pixel values ​​in five consecutive X-ray images are within the range of the target pixel value 58.

[0049] The display control unit 62 is configured such that, based on the situation where the imaging control unit 60 stops the X-ray irradiation of the X-ray irradiation unit 21 because the pixel values ​​in multiple X-ray images are within the range of the target pixel value 58, even if the first operation unit 3a continues to receive input operations to enable X-ray irradiation, the display unit 4a performs a display that can recognize that the X-ray irradiation of the X-ray irradiation unit 21 has stopped.

[0050] Specifically, in the display control unit 62, as a display capable of recognizing that the X-ray irradiation unit 21 has stopped X-ray irradiation, the display unit 4a is made to display the last X-ray image in the generated X-ray images at the time of X-ray irradiation stopping in a recognizable manner, thereby enabling the display unit 4a to perform a display capable of recognizing that the X-ray irradiation of the X-ray irradiation unit 21 has stopped. More specifically, based on the case that the X-ray irradiation unit 21 has stopped X-ray irradiation because the pixel values ​​in multiple X-ray images are within the range of the target pixel value 58, the display control unit 62 makes the display unit 4a display the last X-ray image in the generated X-ray images at the time of X-ray irradiation stopping (last frame held image), and a flag 41 that can recognize that the X-ray image displayed on the display unit 4a is the last frame held image (see reference). Figure 4 ).

[0051] The moving mechanism 7 is configured to move while supporting the X-ray imaging unit 2 and the arm 8. The moving mechanism 7 is configured as a trolley for the X-ray fluoroscopic imaging device 100. In addition, the moving mechanism 7 is provided with multiple wheels 7a, an arm support 7b, and a connecting part 7c.

[0052] Multiple wheels 7a are provided at the lower part of the moving mechanism section 7. This allows the X-ray fluoroscopic imaging device 100 to be moved. In other words, the X-ray fluoroscopic imaging device 100 is a mobile (portable) imaging device.

[0053] The arm support 7b slidably supports the arm 8. Furthermore, the arm support 7b is disposed on the moving mechanism 7 and connected to a connecting portion 7c that allows the arm support 7b and the arm 8 to rotate together about a horizontal axis. The connecting portion 7c rotates relative to the moving mechanism 7 about a vertical axis. Therefore, the arm 8 rotates together with the X-ray irradiation unit 21 and the X-ray detection unit 22 about a vertical axis as the connecting portion 7c rotates.

[0054] The arm portion 8 has an X-ray irradiation section 21 at one end. Furthermore, the arm portion 8 has an X-ray detection section 22 at the other end. The arm portion 8 has a C-shape. The arm portion 8 is a so-called C-shaped arm.

[0055] The monitor trolley 4 includes a display unit 4a and multiple wheels 4b. The monitor trolley 4 is movable due to the multiple wheels 4b.

[0056] Display unit 4a is configured to display an X-ray image of the subject generated by image processing unit 61. Display unit 4a may include, for example, a liquid crystal monitor. Figure 4 As shown, in the image display area 40 of the display unit 4a, an X-ray image generated at a predetermined frame rate is displayed in real time as a dynamic image.

[0057] In addition, such as Figure 4 As shown, the last frame held image is displayed in the image display area 40 of the display unit 4a. When displaying the last frame held image, a marker 41 indicating that it is the last frame held image is displayed in a recognizable manner in the image display area 40 of the display unit 4a. For example, the marker 41 indicating that it is the last frame held image is displayed on the display unit 4a as "LIH".

[0058] Furthermore, a horizontal image 42 is displayed on the display unit 4a. This horizontal image 42 displays the brightness level of the generated X-ray image based on the brightness level of the X-ray image corresponding to the set target pixel value 58. As an example, when the brightness level of the X-ray image corresponding to the set target pixel value 58 is used as the reference level, such as... Figure 4 The image shown is "0"; when the brightness level of the generated X-ray image is increased by 1 level relative to the reference level, the image shown is "+1"; when the brightness level of the generated X-ray image is decreased by 1 level relative to the reference level, the image shown is "-1".

[0059] (Pixel value and target pixel value) Pixel values ​​include specific regions 59 contained in the X-ray image generated by the image processing unit 61 (see reference). Figure 5 The average, maximum, and minimum pixel values ​​of each pixel in the array.

[0060] The target pixel value 58 is included in APR50 (refer to...). Figure 5 The target pixel value 58 includes the average, maximum, and minimum pixel values ​​of each pixel in a specific region 59 defined in each imaging region of the subject. Furthermore, a specific range centered on the target pixel value 58 is preset as the range of the target pixel value 58. For example, a range including a positive or negative percentage of the target pixel value 58 is preset as the range of the target pixel value 58. Moreover, the system is configured to allow modification of the set target pixel value 58. Specifically, it is configured to allow modification by increasing or decreasing the level of the set target pixel value 58 via the target pixel value modification button 37.

[0061] (Operation Section 1 and Operation Section 2) The imaging control unit 60 is configured such that, when receiving an input operation to irradiate with X-rays via the first operation unit 3a, if the pixel value of the generated X-ray image is within the range of the target pixel value 58, the X-ray irradiation performed by the X-ray irradiation unit 21 is stopped even if the input operation to irradiate with X-rays continues to be received via the first operation unit 3a. Furthermore, in this case, the image processing unit 61 is configured to stop generating the X-ray image.

[0062] In contrast, the imaging control unit 60 is configured such that, even if the pixel values ​​of the generated X-ray image are within the range of the target pixel value 58, the X-ray irradiation performed by the X-ray irradiation unit 21 will not be stopped when the input operation to irradiate with X-rays is received by the second operation unit 3b. Furthermore, in this case, the image processing unit 61 is configured to generate the X-ray image.

[0063] Furthermore, the X-ray fluoroscopy imaging apparatus 100 of this embodiment is a surgical X-ray fluoroscopy imaging apparatus. Surgical X-ray fluoroscopy imaging apparatuses are sometimes used to confirm the implantation of bolts in the waist of a patient in the orthopedic field, or to confirm the implantation of steel plates in the arm of a patient. In such cases, the thickness of the waist and arm is different. Therefore, when obtaining a last frame holding image for confirmation, there is a problem in the surgical X-ray fluoroscopy imaging apparatus that it is difficult to optimize the timing of pressing the foot switch due to the different thicknesses of each imaging site. By adopting the configuration of this embodiment, even when the thickness of each imaging site is different, the input operation to irradiate with X-rays is continuously received, and the X-ray irradiation performed by the X-ray irradiation unit 21 is stopped when the pixel value of the pixels contained in the generated X-ray image is within the range of the target pixel value 58. Therefore, it is possible to suppress the reception of input operations that would terminate X-ray irradiation before the pixel value is within the range of the target pixel value 58 due to concerns about increased radiation dose to the subject, and at the same time, it is possible to suppress the increase in X-ray irradiation time caused by input operations that result in continuous X-ray irradiation even when the pixel value is within the range of the target pixel value 58. Therefore, even if the body thickness of each imaging site is different, the timing of pressing the foot switch can be optimized.

[0064] (An example of feedback control when receiving input operations through the first operation unit) Reference Figure 6 An example of feedback control in X-ray fluoroscopic imaging in the first embodiment, where an input operation is received via the first operation unit 3a, will be described based on a sequence diagram.

[0065] In step S1, the imaging control unit 60 receives input operations to the first operation unit 3a. Furthermore, during the processing of steps S1 to S13, the reception of input operations to the first operation unit 3a continues. Additionally, during the processing of steps S1 to S13, if the reception of input operations to the first operation unit 3a is cancelled, the processing ends.

[0066] In step S2, an X-ray fluoroscopic imaging start signal based on a set X-ray irradiation condition 54 is sent from the imaging control unit 60 to the X-ray imaging unit 2. Then, the X-ray imaging unit 2 acquires the X-ray fluoroscopic imaging start signal based on the set X-ray irradiation condition 54.

[0067] In step S3, based on the set X-ray irradiation conditions 54, X-rays are irradiated by the X-ray irradiation unit 21 of the X-ray imaging unit 2, and at the same time, the X-ray detection unit 22 of the X-ray imaging unit 2 obtains the detection signal.

[0068] In step S4, the acquired detection signal is sent from the X-ray detection unit 22 of the X-ray imaging unit 2 to the image processing unit 61. Then, the image processing unit 61 acquires the detection signal.

[0069] In step S5, the image processing unit 61 generates an X-ray image based on the detection signal obtained from the X-ray detection unit 22, and obtains the average, maximum, and minimum pixel values ​​of each pixel in a specific region 59 contained in the X-ray image.

[0070] In step S6, the image processing unit 61 sends the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 to the imaging control unit 60. Then, the imaging control unit 60 obtains the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59.

[0071] In step S7, if the average, maximum, and minimum pixel values ​​of each pixel in the obtained specific region 59 are within the range of the average, maximum, and minimum pixel values ​​of the target pixel value 58, the process proceeds to step S8. Alternatively, if the average, maximum, and minimum pixel values ​​of each pixel in the obtained specific region 59 are not within the range of the average, maximum, and minimum pixel values ​​of the target pixel value 58, the process proceeds to step S11.

[0072] In step S8, if the pixel values ​​of five consecutive X-ray images are within the range of the target pixel value 58, proceed to step S9. Alternatively, if fewer than five consecutive X-ray images have pixel values ​​within the range of the target pixel value 58, proceed to step S13.

[0073] In step S9, an X-ray fluoroscopic imaging end signal is sent from the imaging control unit 60 to the X-ray imaging unit 2. Then, the X-ray imaging unit 2 receives the X-ray fluoroscopic imaging end signal.

[0074] In step S10, the X-ray imaging unit 2 terminates the X-ray fluoroscopic imaging.

[0075] In step S11, the imaging control unit 60 changes the set X-ray irradiation conditions 54.

[0076] In step S12, the imaging control unit 60 sends a start signal for X-ray fluoroscopic imaging based on the modified X-ray irradiation conditions 54 to the X-ray imaging unit 2. Then, in step S3, the X-ray imaging unit 2 receives the start signal for X-ray fluoroscopic imaging based on the modified X-ray irradiation conditions 54.

[0077] In step S13, the imaging control unit 60 sends a start signal for X-ray fluoroscopic imaging based on the maintained and unchanged X-ray irradiation conditions 54 to the X-ray imaging unit 2. Then, in step S3, the X-ray imaging unit 2 receives the start signal for X-ray fluoroscopic imaging based on the maintained and unchanged X-ray irradiation conditions 54.

[0078] (An example of feedback control when input is received via the second operation unit) Reference Figure 7 An example of feedback control in X-ray fluoroscopic imaging in the first embodiment, where an input operation is received via the second operation unit 3b, will be described based on a sequence diagram.

[0079] In step S21, the imaging control unit 60 receives input operations to the second operation unit 3b. Furthermore, during the processing of steps S21 to S30, the reception of input operations to the second operation unit 3b continues. Additionally, if the reception of input operations to the second operation unit 3b is released during the processing of steps S21 to S30, the processing ends.

[0080] The processing of steps S22 to S30 is the same as that of steps S2 to S7 and steps S11 to S13 in the X-ray fluoroscopic imaging feedback control when receiving input operations through the first operation unit 3a, and therefore the explanation is omitted. Furthermore, the processing of steps S23 to S30 is repeated until the reception of input operations to the second operation unit 3b is released.

[0081] (Pixel value adjustment and display processing of X-ray images) Reference Figure 8 and Figure 9 The X-ray image pixel value adjustment processing and X-ray image display processing performed by the control unit 6 in the first embodiment will be described. The X-ray image pixel value adjustment processing and X-ray image display processing performed by the control unit 6 are initiated based on the operation unit 3 receiving input operations related to X-ray irradiation.

[0082] Furthermore, during the processing in steps S101 to S110, the reception of input operations to the first operation unit 3a continues. If the reception of input operations to the first operation unit 3a is cancelled during the processing in steps S101 to S110, the processing ends. Furthermore, during the processing in steps S111 to S116 and S119, the reception of input operations to the second operation unit 3b continues. If the reception of input operations to the second operation unit 3b is cancelled during the processing in steps S111 to S116 and S119, the processing ends. Moreover, the order of the processing steps can be changed or executed simultaneously, provided they do not contradict each other.

[0083] In step S101, the imaging control unit 60 determines whether the input operation related to X-ray irradiation was received through the first operation unit 3a or the second operation unit 3b. If the input operation related to X-ray irradiation was received through the first operation unit 3a, the process proceeds to step S102; if the input operation related to X-ray irradiation was received through the second operation unit 3b, the process proceeds to step S103. Figure 9 Step S111.

[0084] In step S102, the imaging control unit 60 starts X-ray fluoroscopic imaging from the X-ray imaging unit 2 based on the set X-ray irradiation conditions 54, or the modified X-ray irradiation conditions 54 obtained by changing the X-ray irradiation conditions 54. After that, the process proceeds to step S103.

[0085] In step S103, the image processing unit 61 generates an X-ray image based on the detection signal output from the X-ray detection unit 22. Then, the processing proceeds to step S104.

[0086] In step S104, the display control unit 62 causes the display unit 4a to display the X-ray image generated by the image processing unit 61. Afterwards, the process proceeds to step S105.

[0087] In step S105, the image processing unit 61 obtains the average, maximum, and minimum pixel values ​​of each pixel in a specific region 59 contained in the generated X-ray image. Then, the processing proceeds to step S106.

[0088] In step S106, in the imaging control unit 60, if the average, maximum, and minimum values ​​of the pixel values ​​of each pixel in the specific region 59 obtained by the image processing unit 61 are within the range of the target pixel value 58 ("Yes" in step S106), the process proceeds to step S107; if the average, maximum, and minimum values ​​of the pixel values ​​of each pixel in the specific region 59 obtained by the image processing unit 61 are not within the range of the target pixel value 58 ("No" in step S106), the process proceeds to step S110.

[0089] In step S107, in the imaging control unit 60, if the pixel values ​​of five consecutive X-ray images are within the range of the target pixel value 58 ("Yes" in step S107), the process proceeds to step S108; if the number of X-ray images with pixel values ​​within the range of the target pixel value 58 is less than five consecutive frames ("No" in step S107), the process proceeds to step S103. Furthermore, when proceeding to step S103, the X-ray irradiation conditions 54 are not changed.

[0090] In step S108, the imaging control unit 60 causes the X-ray imaging unit 2 to stop X-ray fluoroscopic imaging. After that, the process proceeds to step S109.

[0091] In step S109, the display control unit 62 causes the display unit 4a to display the last frame held image and the "LIH" that can identify the X-ray image displayed on the display unit 4a as the last frame held image. After that, the process ends.

[0092] In step S110, the imaging control unit 60 changes the set X-ray irradiation conditions 54, or changes the X-ray irradiation conditions 54 if the set X-ray irradiation conditions 54 have already been changed. After that, the process proceeds to step S103.

[0093] In step S111, the imaging control unit 60 starts X-ray fluoroscopic imaging from the X-ray imaging unit 2 based on the set X-ray irradiation conditions 54, or the modified X-ray irradiation conditions 54 obtained by changing the X-ray irradiation conditions 54. After that, the process proceeds to step S112.

[0094] In step S112, the image processing unit 61 generates an X-ray image based on the detection signal output from the X-ray detection unit 22. Then, the processing proceeds to step S113.

[0095] In step S113, the display control unit 62 causes the display unit 4a to display the X-ray image generated by the image processing unit 61. Afterwards, the process proceeds to step S114.

[0096] In step S114, the image processing unit 61 obtains the average, maximum, and minimum pixel values ​​of each pixel in a specific region 59 contained in the generated X-ray image. Then, the processing proceeds to step S115.

[0097] In step S115, if the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 obtained by the image processing unit 61 are within the range of the target pixel value 58 ("Yes" in step S115), the imaging control unit 60 proceeds to step S116; if the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 obtained by the image processing unit 61 are not within the range of the target pixel value 58 ("No" in step S115), the processing proceeds to step S119.

[0098] In step S116, the imaging control unit 60 determines whether the reception of X-ray irradiation-related input operations performed through the second operation unit 3b is ongoing. If the reception of X-ray irradiation-related input operations performed through the second operation unit 3b is ongoing ("Yes" in step S116), the process proceeds to step S112; if the reception of X-ray irradiation-related input operations performed through the second operation unit 3b is not ongoing (i.e., the reception of X-ray irradiation-related input operations performed through the second operation unit 3b is cancelled) ("No" in step S116), the process proceeds to step S117. Furthermore, when proceeding to step S112, the X-ray irradiation conditions 54 are not changed.

[0099] In step S117, the imaging control unit 60 causes the X-ray imaging unit 2 to stop X-ray fluoroscopic imaging. After that, the process proceeds to step S118.

[0100] In step S118, the display control unit 62 causes the display unit 4a to display the last frame held image and the "LIH" that can identify the X-ray image displayed on the display unit 4a as the last frame held image. After that, the process ends.

[0101] In step S119, the imaging control unit 60 changes the set X-ray irradiation conditions 54, or changes the X-ray irradiation conditions 54 if the set X-ray irradiation conditions 54 have already been changed. After that, the process proceeds to step S112.

[0102] (Effects of the first embodiment) In the first embodiment, the following effects can be obtained.

[0103] In the first embodiment, as described above, the imaging control unit 60 is configured to stop X-ray irradiation by the X-ray irradiation unit 21 even when the pixel values ​​of the pixels included in the generated X-ray image are within the range of the target pixel value 58, even if an input operation to irradiate with X-rays is continuously received via the first operation unit 3a. Therefore, even if an input operation to irradiate with X-rays is continuously received, X-ray irradiation by the X-ray irradiation unit 21 will stop when the pixel values ​​of the pixels included in the generated X-ray image are within the range of the target pixel value 58. Thus, it is possible to suppress the reception of input operations to cancel X-ray irradiation before the pixel values ​​are within the range of the target pixel value 58 due to concerns about increased radiation dose to the subject, and it is also possible to suppress the increase in X-ray irradiation time caused by continuously receiving input operations to irradiate with X-rays when the pixel values ​​are within the range of the target pixel value 58. Furthermore, when X-ray irradiation is stopped by the imaging control unit 60, since the pixel values ​​of the pixels included in the generated X-ray image are within the range of the target pixel value 58, the visibility of the generated X-ray image can be improved. For these reasons, it is possible to obtain X-ray images with improved visibility while suppressing the increase in radiation dose to the subject.

[0104] Furthermore, in the first embodiment described above, the following further effects can be obtained through the following configuration.

[0105] That is, in the first embodiment, as described above, the imaging control unit 60 is configured such that, when the pixel values ​​of the generated X-ray image are not within the range of the target pixel value 58, in order to adjust the pixel values ​​of the pixels included in the X-ray image, the set X-ray irradiation conditions 54 are changed and the X-ray irradiation unit 21 is irradiated with X-rays. Simultaneously, when the pixel values ​​of the X-ray image generated based on the changed X-ray irradiation conditions 54 are within the range of the target pixel value 58, even if the input operation to irradiate with X-rays is continuously received through the first operation unit 3a, the X-ray irradiation unit 21 is stopped from irradiating with X-rays. Therefore, since the X-ray irradiation conditions 54 are changed in a way that ensures the pixel values ​​of the generated X-ray image are within the range of the target pixel value 58, it is easy to generate X-ray images with pixel values ​​within the range of the target pixel value 58. Thus, X-ray images with improved visibility can be easily obtained.

[0106] Furthermore, in the first embodiment, as described above, a display unit 4a for displaying X-ray images is further provided. The display control unit 62 is configured such that, based on the situation where X-ray irradiation of the X-ray irradiation unit 21 has been stopped because the pixel values ​​in the X-ray image are within the range of the target pixel value 58, even if an input operation to continue X-ray irradiation is received through the first operation unit 3a, the display unit 4a performs a display that can identify that X-ray irradiation of the X-ray irradiation unit 21 has been stopped. Thus, the user can easily visually recognize that X-ray irradiation has been stopped because the pixel values ​​in the X-ray image are within the range of the target pixel value 58.

[0107] Furthermore, in the first embodiment, as described above, the display control unit 62, acting as a display capable of recognizing that the X-ray irradiation unit 21 has stopped X-ray irradiation, displays on the display unit 4a in a recognizable manner: the last X-ray image in the generated X-ray image at the time of stopping X-ray irradiation is displayed on the display unit 4a. This causes the display unit 4a to perform a display capable of recognizing that X-ray irradiation of the X-ray irradiation unit 21 has stopped. Thus, based on the display of the last X-ray image at the time of stopping X-ray irradiation and the aforementioned display of the X-ray image, the user can more easily visually recognize that X-ray irradiation has stopped because the pixel values ​​in the X-ray image are within the range of the target pixel value 58.

[0108] Furthermore, in the first embodiment, as described above, the image processing unit 61 is configured to sequentially generate X-ray images, and the imaging control unit 60 is configured to stop the X-ray irradiation unit 21 from irradiating X-rays even when the pixel values ​​in a set plurality of X-ray images are within the range of the target pixel value 58, even if the input operation to irradiate X-rays is continuously received through the first operation unit 3a. This suppresses the possibility of stopping X-ray irradiation of the X-ray irradiation unit 21 when the pixel value in an X-ray image is within the range of the target pixel value 58 due to the movement of the subject. Therefore, the accuracy of obtaining X-ray images with improved visibility can be improved.

[0109] Furthermore, in the first embodiment, as described above, the operation unit 3 includes a first operation unit 3a and a second operation unit 3b. The imaging control unit 60 is configured such that, when an input operation to irradiate with X-rays is received through the first operation unit 3a, if the pixel value of the generated X-ray image is within the range of the target pixel value 58, even if the input operation to irradiate with X-rays is continuously received through the first operation unit 3a, the X-ray irradiation performed by the X-ray irradiation unit 21 is stopped, and the generation of the X-ray image is stopped; when an input operation to irradiate with X-rays is received through the second operation unit 3b, even if the pixel value of the generated X-ray image is within the range of the target pixel value 58, the X-ray irradiation performed by the X-ray irradiation unit 21 is not stopped, and the X-ray image is generated. Thus, the user can appropriately select, according to the intended use, the first operation unit 3a, which stops the X-ray irradiation of the X-ray irradiation unit 21 even if the input operation to irradiate with X-rays is continuously received; and the second operation unit 3b, which irradiates X-rays by the X-ray irradiation unit 21 as long as the input operation to irradiate with X-rays is continuously received. Therefore, it can improve user usability.

[0110] Furthermore, in the first embodiment, as described above, the pixel value includes the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 contained in the X-ray image generated by the image processing unit 61, while the target pixel value 58 includes the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 set in each imaging part of the subject. Therefore, when the pixel values ​​of the pixels contained in the generated X-ray image are within the range of the target pixel value 58, since the average, maximum, and minimum pixel values ​​of each pixel in the specific region 59 contained in the X-ray image are all within the desired range, the accuracy of obtaining an X-ray image with improved visibility can be improved.

[0111] Furthermore, in the first embodiment, as described above, the range of the target pixel value 58 is a pre-set specific range centered on the target pixel value 58. Therefore, by ensuring that the target pixel value 58 has a certain width when X-ray irradiation by the X-ray irradiation unit 21 is stopped, X-ray irradiation by the X-ray irradiation unit 21 can be appropriately stopped when the pixel values ​​in the X-ray image are contained within an allowable range centered on the target pixel value 58.

[0112] Furthermore, in the first embodiment, as described above, the target pixel value 58 is configured to be changeable. Therefore, the target pixel value 58 can be changed according to the imaging region of the subject, the thickness of the subject, and the purpose, thus enabling the acquisition of an X-ray image with appropriate brightness corresponding to the thickness and purpose of the subject.

[0113] [Second Implementation] Next, refer to Figure 10 and Figure 11 The second embodiment of the present invention will now be described. In the X-ray fluoroscopic imaging apparatus 110 of the second embodiment, unlike the first embodiment described above where the operation unit 3 includes a first operation unit 3a and a second operation unit 3b, it is configured to be able to select a first fluoroscopic mode and a second fluoroscopic mode. This example will be described below. Furthermore, for configurations identical to those in the first embodiment described above, the same reference numerals will be used, and their descriptions will be omitted.

[0114] The operating unit 3 includes a foot switch 70 and an operating panel 33. The operating panel 33 is provided with multiple input sections 33a (see reference 1) for receiving input operations related to X-ray irradiation. Figure 11 (b)). The input section 33a includes an X-ray fluoroscopy button 36b and a target pixel value change button 37.

[0115] like Figure 11 As shown in (a), the foot switch 70 is configured to receive input operations related to the start and end of X-ray irradiation performed using the X-ray irradiation unit 21. The foot switch 70 includes: a fourth foot switch 74 for performing fluoroscopic imaging based on the selected first fluoroscopic mode or second fluoroscopic mode; and a fifth foot switch 75 for performing general imaging.

[0116] like Figure 11 As shown in (b), the X-ray fluoroscopy button 36b is configured to receive input operations related to the start and end of X-ray irradiation performed using the X-ray irradiation unit 21. The X-ray fluoroscopy button 36b is configured to receive input operations related to the start and end of fluoroscopic imaging based on the selected first fluoroscopy mode or second fluoroscopy mode.

[0117] In addition, the operation panel 33 is provided with a first perspective mode selection button 38 and a second perspective mode selection button 39. The first perspective mode selection button 38 is a button that receives input for selecting the first perspective mode. The second perspective mode selection button 39 is a button that receives input for selecting the second perspective mode.

[0118] (Perspective Mode 1 and Perspective Mode 2) The first perspective mode is as follows: when the pixel value of the X-ray image generated by the image processing unit 61 is within the range of the target pixel value 58, even if the input operation to irradiate with X-rays is continuously received through the operation unit 3, the imaging control unit 60 stops the X-ray irradiation performed by the X-ray irradiation unit 21, and the image processing unit 61 stops generating the X-ray image.

[0119] The second perspective mode is as follows: even if the pixel value of the X-ray image generated by the image processing unit 61 is within the range of the target pixel value 58, the imaging control unit 60 does not stop the X-ray irradiation performed by the X-ray irradiation unit 21, and the image processing unit 61 generates the X-ray image.

[0120] The difference between X-ray fluoroscopic imaging based on the first fluoroscopic mode and the X-ray fluoroscopic imaging in the first embodiment described above, where input is received via the first operation unit 3a, is that the former is configured such that the first fluoroscopic mode is pre-selected via the first fluoroscopic mode selection button 38. In other words, X-ray fluoroscopic imaging based on the first fluoroscopic mode is performed in the same manner as the X-ray fluoroscopic imaging in the first embodiment described above, except that the first fluoroscopic mode selection button 38 is used and the first operation unit 3a is not used.

[0121] Furthermore, the X-ray fluoroscopic imaging based on the second fluoroscopic mode differs from the X-ray fluoroscopic imaging in the first embodiment described above, where input is received via the second operation unit 3b, in that the former is configured such that the second fluoroscopic mode is pre-selected via the second fluoroscopic mode selection button 39. In other words, the X-ray fluoroscopic imaging based on the second fluoroscopic mode is performed in the same manner as the X-ray fluoroscopic imaging in the first embodiment described above, except that the second fluoroscopic mode selection button 39 is used and the second operation unit 3b is not used.

[0122] (Pixel value adjustment and display processing of X-ray images) Reference Figure 12 and Figure 13 The X-ray image pixel value adjustment processing and X-ray image display processing performed by the control unit 6 in the second embodiment will be described below. The X-ray image pixel value adjustment processing and X-ray image display processing performed by the control unit 6 are initiated upon receiving input operations from either the first fluoroscopy mode selection button 38 or the second fluoroscopy mode selection button 39. Furthermore, in the subsequent description of the X-ray image pixel value adjustment processing and X-ray image display processing performed by the control unit 6 in the second embodiment, "operation unit 3" refers to the fourth foot switch 74 or the X-ray fluoroscopy button 36b.

[0123] Furthermore, during steps S203 to S211, the reception of input operations to the operation unit 3 continues. If the reception of input operations to the operation unit 3 is cancelled during steps S203 to S211, the process ends. Furthermore, during steps S213 to S218 and S221, the reception of input operations to the operation unit 3 continues. If the reception of input operations to the operation unit 3 is cancelled during steps S213 to S218 and S221, the process ends. Moreover, the order of the processing steps can be changed or executed simultaneously, provided they do not contradict each other.

[0124] In step S201, the imaging control unit 60 determines whether an input operation was received on the first perspective mode selection button 38 or the second perspective mode selection button 39. If an input operation was received on the first perspective mode selection button 38 ("Yes" in step S201), the process proceeds to step S202; if an input operation was received on the second perspective mode selection button 39 ("No" in step S201), the process proceeds to step S202. Figure 13 Step S212.

[0125] In step S202, the imaging control unit 60 determines whether an input operation related to X-ray irradiation performed by the operation unit 3 has been received. If the input operation related to X-ray irradiation performed by the operation unit 3 has been received ("Yes" in step S202), the process proceeds to step S203; if the input operation related to X-ray irradiation performed by the operation unit 3 has not been received ("No" in step S202), the process proceeds to step S202.

[0126] Processing of steps S203 to S211 Figure 8 The processes of steps S102 to S110 in the first embodiment shown above are the same, so the description is omitted.

[0127] In step S212, the imaging control unit 60 determines whether an input operation related to X-ray irradiation performed by the operation unit 3 has been received. If an input operation related to X-ray irradiation has been received by the operation unit 3 ("Yes" in step S212), the process proceeds to step S213; if no input operation related to X-ray irradiation has been received by the operation unit 3 ("No" in step S212), the process proceeds to step S212.

[0128] The processing in steps S213 to S221, except that the second operation unit 3b is replaced by the operation unit 3, is the same as... Figure 9 The processes of steps S111 to S119 in the first embodiment shown above are the same, so the description is omitted.

[0129] The other configurations of the second embodiment are the same as those of the first embodiment described above.

[0130] (Effects of the second implementation method) In the second embodiment, the following effects can be obtained.

[0131] In the second embodiment, as described above, the imaging control unit 60 is configured to allow selection of a first fluoroscopic mode and a second fluoroscopic mode. When the first fluoroscopic mode is selected, if the pixel values ​​of the generated X-ray image are within the range of the target pixel value 58, X-ray irradiation by the X-ray irradiation unit 21 is stopped, and X-ray image generation is stopped, even if the input operation to irradiate with X-rays is continuously received via the operation unit 3. When the second fluoroscopic mode is selected, X-ray irradiation by the X-ray irradiation unit 21 is not stopped, and X-ray image generation is stopped, even if the pixel values ​​of the generated X-ray image are within the range of the target pixel value 58. Thus, the user can appropriately select, according to their purpose, the first fluoroscopic mode, which stops X-ray irradiation by the X-ray irradiation unit 21 even if the input operation to irradiate with X-rays is continuously received; and the second fluoroscopic mode, which irradiates with X-rays by the X-ray irradiation unit 21 as long as the input operation to irradiate with X-rays is continuously received. Therefore, user convenience is improved.

[0132] Furthermore, the other effects of the second embodiment are the same as those of the first embodiment described above.

[0133] [Variation Example] Furthermore, the embodiments disclosed herein should be considered illustrative rather than restrictive in all respects. The scope of the invention is defined not by the description of the above embodiments but by the scope of the claims, and includes all modifications (variations) within the meaning and scope equivalent to the scope of the claims.

[0134] For example, in the first and second embodiments described above, an X-ray fluoroscopy imaging apparatus is shown as a surgical X-ray fluoroscopy imaging apparatus having a main body including an X-ray imaging unit and an arm, and a monitor trolley unit; however, the present invention is not limited thereto. For example, the X-ray fluoroscopy imaging apparatus may also be an X-ray fluoroscopy imaging apparatus having a proximity fluoroscopy table.

[0135] Furthermore, in the first and second embodiments described above, examples of X-ray fluoroscopy buttons including a foot switch and an operation panel were shown, but the present invention is not limited thereto. For example, the operation unit may also be configured to include a joystick, a cable switch, a keyboard, and a touch panel.

[0136] Furthermore, in the first and second embodiments described above, an example is shown where the target pixel value includes the average, maximum, and minimum values ​​of pixel values ​​in a specific region set in each imaging part of the subject. The imaging control unit is configured to stop X-ray irradiation performed by the X-ray irradiation unit even if the average, maximum, and minimum values ​​of pixel values ​​in the specific region contained in the generated X-ray image are within the range of the target pixel value. However, the present invention is not limited to this. For example, the target pixel value may also be configured to include at least one of the average, maximum, and minimum values ​​of pixel values ​​in a specific region set in each imaging part of the subject. In this case, the target pixel value includes at least one of the average, maximum, and minimum values ​​of pixel values ​​in the specific region set in each imaging part of the subject, and the imaging control unit may also be configured to stop X-ray irradiation performed by the X-ray irradiation unit when at least one of the average, maximum, and minimum values ​​of pixel values ​​in the specific region obtained by the image processing unit is within the range of at least one of the corresponding average, maximum, and minimum values ​​in the target pixel value.

[0137] Furthermore, in the first and second embodiments described above, examples were shown where the target pixel value included the average, maximum, and minimum values ​​of the pixel values ​​of each pixel in a specific region defined in each imaging part of the subject. However, the present invention is not limited thereto. For example, the target pixel value may be configured to include other values ​​such as the median value instead of any one of the average, maximum, and minimum values ​​of the pixel values ​​of each pixel in a specific region defined in each imaging part of the subject, or it may be configured to include other values ​​such as the median value in addition to the average, maximum, and minimum values.

[0138] Furthermore, in the first and second embodiments described above, examples were shown where the range of target pixel values ​​was a pre-defined specific range centered on the target pixel value; however, the present invention is not limited to this. For example, the range of target pixel values ​​may be any range that includes the target pixel value, even if it is not centered on the target pixel value.

[0139] Furthermore, in the first and second embodiments described above, examples were shown where the target pixel value could be changed, but the present invention is not limited thereto. For example, it may also be configured so that the target pixel value cannot be changed.

[0140] Furthermore, in the first embodiment described above, an example was shown where the operation unit includes a second operation unit, but the present invention is not limited thereto. For example, the operation unit may only include a first operation unit and not a second operation unit. Furthermore, in the second embodiment described above, an example was shown where a first perspective mode and a second perspective mode can be selected, but the present invention is not limited thereto. For example, it may be configured so that only the first perspective mode can be executed.

[0141] Furthermore, in the first and second embodiments described above, an example was shown where the imaging control unit was configured to change the set X-ray irradiation conditions and irradiate X-rays when the pixel values ​​of the generated X-ray image were not within the range of the target pixel values; however, the present invention is not limited thereto. For example, the imaging control unit may also irradiate X-rays by the X-ray irradiation unit without changing the set X-ray irradiation conditions.

[0142] Furthermore, in the first and second embodiments described above, an example is shown where the display control unit is configured such that, based on the situation where X-ray irradiation of the X-ray irradiation unit has been stopped because the pixel value in the X-ray image is within the range of the target pixel value, even if an input operation to irradiate X-rays is continuously received through the first operation unit or the operation unit in the first fluoroscopy mode, the display unit performs a display that can recognize that X-ray irradiation of the X-ray irradiation unit has stopped. However, the present invention is not limited to this. For example, the display control unit may also not perform a display that can recognize that X-ray irradiation of the X-ray irradiation unit has stopped.

[0143] [plan] Those skilled in the art should understand that the above exemplary embodiments are specific examples of the following solutions.

[0144] (Project 1) An X-ray fluoroscopic imaging device, comprising: An X-ray irradiation unit that irradiates X-rays; An X-ray detection unit that detects X-rays irradiated by the X-ray irradiation unit; An operation unit that receives input operations related to X-ray irradiation performed using the X-ray irradiation unit; and A control unit that controls the X-ray irradiation unit to irradiate X-rays based on input operations of the operation unit, and controls the generation of X-ray images based on detection signals output from the X-ray detection unit. The control unit is configured such that, if the pixel values ​​of the pixels contained in the generated X-ray image are within the range of the target pixel values, the X-ray irradiation unit will stop irradiating with X-rays even if the operation unit continuously receives an input operation to irradiate with X-rays.

[0145] (Project 2) The X-ray fluoroscopic imaging device according to Project 1 is characterized in that... The control unit is configured to: when the pixel values ​​of the generated X-ray image are not within the range of the target pixel values, change the set X-ray irradiation conditions and irradiate the X-ray irradiation unit with X-rays in order to adjust the pixel values ​​of the pixels included in the X-ray image; and when the pixel values ​​of the X-ray image generated based on the changed X-ray irradiation conditions are within the range of the target pixel values, stop the X-ray irradiation unit from irradiating with X-rays even if the input operation to irradiate with X-rays is continuously received through the operation unit.

[0146] (Project 3) The X-ray fluoroscopic imaging apparatus according to item 1 or 2 is characterized in that, It further includes a display unit for displaying the X-ray image. The control unit is configured such that, based on the situation where X-ray irradiation of the X-ray irradiation unit is stopped because the pixel value in the X-ray image is within the range of the target pixel value, even if the operation unit continues to receive input operations to cause X-ray irradiation, the display unit performs a display that can recognize that X-ray irradiation of the X-ray irradiation unit has stopped.

[0147] (Project 4) The X-ray fluoroscopic imaging device according to Project 3 is characterized in that... The control unit is configured to display, in a recognizable manner, that the last X-ray image in the generated X-ray image at the time of stopping X-ray irradiation is displayed on the display unit, thereby enabling the display unit to perform a display that recognizes that the X-ray irradiation of the X-ray irradiation unit has stopped.

[0148] (Project 5) The X-ray fluoroscopic imaging apparatus according to any one of items 1 to 4 is characterized in that... The control unit is configured to generate the X-ray images sequentially, and is configured to stop the X-ray irradiation unit from irradiating X-rays even when the pixel values ​​in the set plurality of X-ray images are within the range of the target pixel values, even if the operation unit continuously receives an input operation to irradiate X-rays.

[0149] (Project 6) The X-ray fluoroscopic imaging apparatus according to any one of items 1 to 5 is characterized in that... The operating unit includes a first operating unit and a second operating unit. The control unit is configured as follows: When an input operation to irradiate with X-rays is received through the first operation unit, if the pixel value of the generated X-ray image is within the range of the target pixel value, the X-ray irradiation performed by the X-ray irradiation unit is stopped and the generation of the X-ray image is stopped, even if the input operation to irradiate with X-rays is continuously received through the first operation unit. When the input operation to irradiate with X-rays is received by the second operation unit, the X-ray irradiation performed by the X-ray irradiation unit is not stopped even if the pixel value of the generated X-ray image is within the range of the target pixel value, and the X-ray image is generated.

[0150] (Project 7) The X-ray fluoroscopic imaging apparatus according to any one of items 1 to 5 is characterized in that... Its configuration allows users to select between a first perspective mode and a second perspective mode. The control unit is configured as follows: When the first fluoroscopic mode is selected, if the pixel value of the generated X-ray image is within the range of the target pixel value, even if the input operation to irradiate with X-rays is continuously received through the operation unit, the X-ray irradiation performed by the X-ray irradiation unit is stopped, and the generation of the X-ray image is stopped. When the second perspective mode is selected, even if the pixel value of the generated X-ray image is within the range of the target pixel value, the X-ray irradiation performed by the X-ray irradiation unit is not stopped, and the X-ray image is generated.

[0151] (Project 8) The X-ray fluoroscopic imaging device according to Project 1 is characterized in that... The pixel value includes at least one of the average, maximum, and minimum pixel values ​​of each pixel in a specific region contained in the X-ray image generated by the control unit, while the target pixel value includes at least one of the average, maximum, and minimum pixel values ​​of each pixel in the specific region set in each imaging part of the subject.

[0152] (Project 9) The X-ray fluoroscopic imaging device according to Project 8 is characterized in that... The range of the target pixel value is a pre-defined specific range centered on the target pixel value.

[0153] (Project 10) The X-ray fluoroscopic imaging device according to Project 8 is characterized in that... It is configured to be able to change the set target pixel value.

[0154] Explanation of reference numerals in the attached figures 3. Operations Section 3a First Operation Section 3b Second Operation Section 4a Display Section 21 X-ray Irradiation Section 22 X-ray Inspection Department 54 X-ray irradiation conditions 58 Target pixel values 59 Specific Areas 6. Control Department 100 and 110 X-ray fluoroscopic imaging devices.

Claims

1. An X-ray fluoroscopic imaging device, comprising: An X-ray irradiation unit that irradiates X-rays; An X-ray detection unit that detects X-rays irradiated by the X-ray irradiation unit; An operation unit that receives input operations related to X-ray irradiation performed using the X-ray irradiation unit; and A control unit that controls the X-ray irradiation unit to irradiate X-rays based on input operations of the operation unit, and controls the generation of X-ray images based on detection signals output from the X-ray detection unit. The control unit is configured such that, if the pixel values ​​of the pixels contained in the generated X-ray image are within the range of the target pixel values, the X-ray irradiation unit will stop irradiating with X-rays even if the operation unit continuously receives an input operation to irradiate with X-rays.

2. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, The control unit is configured to: when the pixel values ​​of the generated X-ray image are not within the range of the target pixel values, change the set X-ray irradiation conditions and irradiate the X-ray irradiation unit with X-rays in order to adjust the pixel values ​​of the pixels included in the X-ray image; and when the pixel values ​​of the X-ray image generated based on the changed X-ray irradiation conditions are within the range of the target pixel values, stop the X-ray irradiation unit from irradiating with X-rays even if the input operation to irradiate with X-rays is continuously received through the operation unit.

3. The X-ray fluoroscopic imaging device according to claim 1, characterized in that, It further includes a display unit for displaying the X-ray image. The control unit is configured such that, based on the situation where X-ray irradiation of the X-ray irradiation unit is stopped because the pixel value in the X-ray image is within the range of the target pixel value, even if the operation unit continues to receive input operations to cause X-ray irradiation, the display unit performs a display that can recognize that X-ray irradiation of the X-ray irradiation unit has stopped.

4. The X-ray fluoroscopic imaging apparatus according to claim 3, characterized in that, The control unit is configured to display, in a recognizable manner, that the last X-ray image in the generated X-ray image at the time of stopping X-ray irradiation is displayed on the display unit, thereby enabling the display unit to perform a display that recognizes that the X-ray irradiation of the X-ray irradiation unit has stopped.

5. The X-ray fluoroscopic imaging apparatus according to claim 1, characterized in that, The control unit is configured to generate the X-ray images sequentially, and is configured to stop the X-ray irradiation unit from irradiating X-rays even when the pixel values ​​in the set plurality of X-ray images are within the range of the target pixel values, even if the operation unit continuously receives an input operation to irradiate X-rays.

6. The X-ray fluoroscopic imaging apparatus according to claim 1, characterized in that, The operating unit includes a first operating unit and a second operating unit. The control unit is configured as follows: When an input operation to irradiate with X-rays is received through the first operation unit, if the pixel value of the generated X-ray image is within the range of the target pixel value, the X-ray irradiation performed by the X-ray irradiation unit is stopped and the generation of the X-ray image is stopped, even if the input operation to irradiate with X-rays is continuously received through the first operation unit. When the input operation to irradiate with X-rays is received by the second operation unit, the X-ray irradiation performed by the X-ray irradiation unit is not stopped even if the pixel value of the generated X-ray image is within the range of the target pixel value, and the X-ray image is generated.

7. The X-ray fluoroscopic imaging apparatus according to claim 1, characterized in that, Its configuration allows users to select between a first perspective mode and a second perspective mode. The control unit is configured as follows: When the first fluoroscopic mode is selected, if the pixel value of the generated X-ray image is within the range of the target pixel value, even if the input operation to irradiate with X-rays is continuously received through the operation unit, the X-ray irradiation performed by the X-ray irradiation unit is stopped, and the generation of the X-ray image is stopped. When the second perspective mode is selected, even if the pixel value of the generated X-ray image is within the range of the target pixel value, the X-ray irradiation performed by the X-ray irradiation unit is not stopped, and the X-ray image is generated.

8. The X-ray fluoroscopic imaging apparatus according to claim 1, characterized in that, The pixel value includes at least one of the average, maximum, and minimum pixel values ​​of each pixel in a specific region contained in the X-ray image generated by the control unit, while the target pixel value includes at least one of the average, maximum, and minimum pixel values ​​of each pixel in the specific region set in each imaging part of the subject.

9. The X-ray fluoroscopic imaging apparatus according to claim 8, characterized in that, The range of the target pixel value is a pre-defined specific range centered on the target pixel value.

10. The X-ray fluoroscopic imaging apparatus according to claim 8, characterized in that, It is configured to be able to change the set target pixel value.

Images