JP2010273834A - X-ray image diagnostic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image suitable for diagnosis when fluoroscopically or digitally angiographically (DA) imaging a region where an X-ray is directly detected, such as a lower limb concerning an X-ray image diagnostic apparatus. <P>SOLUTION: The X-ray image diagnostic apparatus 10 includes: an X-ray for irradiating the prescribed region of a subject with the X-ray; an image receiver for receiving the X-ray image; a top plate to place the subject; an image processing unit 52 for generating the image, based on data to be obtained by the image receiver, while moving the top plate in a long axis direction without changing the positions of the X-ray irradiator and the image receiver; an X-ray condition control unit 63 for obtaining the X-ray condition of a succeeding image collection timing so as to allow an image level in a concerned region on the image to substantially coincide with a predetermined image level, and then, controlling the X-ray irradiating means according to the X-ray condition; and an X-ray condition fixing unit 64 for fixing the X-ray condition at a desired time point. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an X-ray diagnostic imaging apparatus that displays a fluoroscopic image of a contrasted blood vessel and a DA (digital angiography) image.

  The X-ray image diagnostic apparatus is an image apparatus that displays the intensity of X-rays transmitted through the body of a patient as a grayscale image, and there are various types depending on purposes such as diagnosis and treatment. The method of visualizing the transmitted X-ray image is roughly divided into two methods: fluoroscopy and radiography.

  As a technique for angiographic examination of the lower limbs, a fluoroscopic image and a DA image (DA image) of the contrast blood vessel while moving the top plate on which the patient is placed in the body axis direction according to the flow of the contrast medium injected into the patient There is a technique for displaying a captured image. The blood vessels in the lower limbs are thin in the peripheral part, and the above-described technique in which the subtraction process is not performed may cause a problem in visibility. However, contrast blood vessel images can be collected in real time while the top plate is arbitrarily moved according to the operator's intention.

  In an angiographic examination of the lower limbs, X-rays are directly incident on the flat detector from the gap between the legs during the collection cut. Further, a portion where direct X-rays are incident often occurs in a portion where an ROI (region of interest) is arranged in the image. Under the ABC (auto brightness control), both leg portions are affected by the direct X-rays in the ROI. The X-ray condition irradiated to the operator's ROI is lower than the appropriate amount. As a result, since the image level of the entire image is lowered, the entire image is visually darkened, and it becomes difficult to visually recognize the contrasted blood vessel.

  In order to compensate for a decrease in the image level of the entire image due to direct X-ray incidence, a shield is generally disposed between the legs of the patient to prevent direct X-ray incidence on the detector. In recent years, visual recognition of contrasted blood vessels in a dark background has been improved by a background homogenization process using image processing.

  In addition, the following patent documents are mentioned as technical documents relevant to the present invention.

JP 2008-148866 A

  However, it is troublesome for the operator to place a shield between both legs of the patient. Further, in the background homogenization processing by image processing, the image level is maintained and the blood vessel visibility is improved. However, since the original incident X-rays are small, the influence of a low signal-to-noise (S / N) ratio. As a result, there is a case where a satisfactory image cannot be obtained, for example, the visibility of a blood vessel having a thin peripheral portion is not improved.

  The present invention has been made in consideration of the above-described circumstances, and can provide an image suitable for diagnosis when fluoroscopy or DA imaging is performed on a part that directly detects X-rays such as the lower limbs. An object is to provide an image diagnostic apparatus.

  In order to solve the above-described problem, an X-ray diagnostic imaging apparatus according to the present invention includes an X-ray irradiation unit that irradiates an X-ray toward a predetermined part of a subject, an image receiving unit that receives the X-ray, An image is generated based on data obtained by the image receiving means while moving the table top in the major axis direction without changing the positions of the top plate on which the subject is placed and the X-ray irradiation means and the image receiving means. An X-ray condition of the next image acquisition timing is obtained so that an image level in the region of interest on the image substantially matches a preset image level, and the X-ray irradiation is performed according to the X-ray condition. X-ray condition control means for controlling the means, and X-ray condition fixing means for fixing the X-ray condition at a required time.

  The X-ray image diagnostic apparatus according to the present invention can provide an image suitable for diagnosis when fluoroscopic or DA imaging is performed on a part that directly detects X-rays, such as the lower limbs.

Schematic which shows the hardware constitutions of the X-ray image diagnostic apparatus of this embodiment. Schematic which shows the external appearance structure of the C arm holding | maintenance apparatus in the X-ray image diagnostic apparatus of this embodiment. The block diagram which shows the function of the X-ray image diagnostic apparatus of this embodiment. (A) thru | or (d) is a figure which shows the DA image obtained with the conventional X-ray image diagnostic apparatus. (A) thru | or (d) is a figure which shows the DA image obtained with the X-ray image diagnostic apparatus of this embodiment. (A) thru | or (d) is a figure which shows the DA image obtained with the X-ray image diagnostic apparatus of this embodiment.

  An embodiment of an X-ray image diagnostic apparatus according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram illustrating a hardware configuration of the X-ray image diagnostic apparatus according to the present embodiment. FIG. 2 is a schematic diagram showing an external configuration of the C-arm holding device in the X-ray image diagnostic apparatus of the present embodiment.

  1 and 2 show an X-ray image diagnostic apparatus 10 of the present embodiment. The X-ray diagnostic imaging apparatus 10 mainly includes a C-arm holding device 11 and a DF (digital fluorography) device 12.

  The C arm holding device 11 having a C arm structure includes a holding device main body 21, a body frame 22, a top plate holding mechanism 23, a top plate (catheter table) 24, a C arm holding mechanism 25, a C arm 26, an X-ray irradiation device 27, An image receiving device 28, a controller 30, a high voltage supply device 31, a drive mechanism 32, and an operation unit 33 are provided. The C-arm holding device 11 will be described as an under tube type in which the X-ray irradiation device 27 is positioned below the top plate 24, but the overtube in which the X-ray irradiation device 27 is positioned above the top plate 24. It may be a type.

  The holding device body 21 is fixed to the floor.

  The body frame 22 is supported by the holding device main body 21. The body frame 22 supports the top plate holding mechanism 23 and the C arm holding mechanism 25 that supports the C arm 26. The body frame 22 moves up and down with respect to the holding device main body 21 by integrating the top plate 24, the top plate holding mechanism 23, the C arm 26 and the C arm holding mechanism 25 via the drive mechanism 32 of the body frame 22 (FIG. 2). (A direction in the middle A) and tilting motion (the B direction in FIG. 2).

  The top plate holding mechanism 23 is cantilevered by the body frame 22. The top plate holding mechanism 23 moves the top plate 24 left and right (C-LAT: direction C in FIG. 2) and up and down (C-VERT: direction D in FIG. 2) via the drive mechanism 32 of the top plate holding mechanism 23. And rolling (ROLL) is provided.

  The top plate 24 is supported by the top plate holding mechanism 23. The top plate 24 places the patient P thereon.

  The C arm holding mechanism 25 is supported by the body frame 22. The C-arm holding mechanism 25 is formed by integrating the C-arm holding mechanism 25 and the C-arm 26 via the drive mechanism 32 of the C-arm holding mechanism 25, and the long axis direction of the body frame 22 (C-LONG: direction E in FIG. 2). To be slidable.

  The C arm 26 pivots (CRA / CAU: direction F in FIG. 2) and circular motion (LAO / RAO: FIG. 2) around the attachment position with the C arm holding mechanism 25 via the drive mechanism 32 of the C arm 26. (In the middle G direction). The C arm 26 makes the X-ray irradiation device 27 and the image receiving device 28 face each other with the patient P as the center.

  The X-ray irradiation device 27 is provided at one end of the C arm 26. The X-ray irradiation device 27 is provided so as to be able to move back and forth (H direction in FIG. 2) via the drive mechanism 32 of the X-ray irradiation device 27.

  The X-ray irradiation device 27 receives supply of high voltage power from the high voltage supply device 31, and emits X-rays from the X-ray tube toward a predetermined part of the subject (patient) P according to the conditions of the high voltage power. Irradiate. The X-ray irradiation device 27 emits a predetermined amount of irradiated X-rays on the emission side of the X-ray tube in order to prevent halation formed by an X-ray irradiation field stop composed of a plurality of lead feathers, silicon rubber, or the like. A compensation filter for attenuation is provided. The X-ray irradiation device 27 can irradiate imaging X-rays for imaging a predetermined part or fluoroscopic X-rays for seeing through a predetermined part. For example, radiographic X-rays are irradiated by controlling the X-ray irradiation device 27 to a tube voltage of 120 [kV] and a tube current of 300 [mA], while fluoroscopic X-rays are applied to the X-ray irradiation device 27 at a tube voltage of 120. Irradiation is performed by controlling to [kV] and tube current 100 [mA].

  The image receiving device 28 is provided at the other end of the C arm 26 and on the emission side of the X-ray irradiation device 27. The image receiving device 28 is provided so as to be able to move back and forth (I direction in FIG. 2) via the drive mechanism 32 of the image receiving device 28.

  The image receiving device 28 is connected to the I.I. I. (Image intensifier) -TV system. I. 28a, a TV camera 28b, and an A / D (analog to digital) conversion circuit 28c. I. I. 28a converts X-rays transmitted through the patient P and X-rays that are directly incident into visible light, and further doubles the luminance in the process of light-electron-light conversion to form sensitive projection data. The TV camera 28b converts optical projection data into an electrical signal using a CCD (charge coupled device) image sensor. The A / D conversion circuit 28c converts a time-series analog signal (video signal) output from the TV camera 28b into a digital signal.

  Note that the image receiving device 28 may include a flat panel detector (FPD). When the image receiving device 28 has an FPD, the image receiving device 28 detects X-rays by detection elements arranged in a 2D shape and converts them into electric signals.

  The controller 30 includes a CPU and a memory (not shown). The controller 30 controls operations of the high voltage supply device 31 and the drive mechanism 32 in accordance with instructions from the DF device 12.

  The high voltage supply device 31 supplies high voltage power to the X-ray tube of the X-ray irradiation device 27 under the control of the controller 30.

  The drive mechanism 32 drives the X-ray irradiation device 27, the image receiving device 28, the C arm 26, the holding device main body 21, the body frame 22, the top plate holding mechanism 23, and the C arm holding mechanism 25 according to the control of the controller 30.

  The operation unit 33 is configured by a switch or the like that an operator such as an X-ray technician gives various instructions to the controller 30.

  The DF device 12 is configured based on a computer, and can communicate with a network N such as a hospital-based LAN (local area network). The DF device 12 generally includes a CPU (central processing unit) 41 as a processor, a memory 42, an HD (hard disc) 43, an input device 44, a communication control device 45, a projection data storage unit 51, an image processing unit 52, an image. It comprises hardware such as a data storage unit 53 and a display device 54. The CPU 41 is interconnected to each hardware component constituting the DF device 12 via a bus as a common signal transmission path. Note that the DF device 12 may include a recording medium drive (not shown).

  The CPU 41 executes a program stored in the memory 42 when a command is input by operating the input device 44 by an examination practitioner such as a doctor or a technician. Alternatively, the CPU 41 uses a program stored in the HD 43, a program transferred from the network N and received by the communication control device 45 and installed in the HD 43, or a recording medium mounted on a recording medium drive (not shown). The program read and installed in the HD 43 is loaded into the memory 42 and executed.

  The memory 42 is a storage device having a configuration that combines elements such as a ROM (read only memory) and a RAM (random access memory). The memory 42 stores IPL (initial program loading) and BIOS (basic input / output system) data, and is used for temporary storage of the work memory of the CPU 41 and data.

  The HD 43 is a storage device having a configuration in which a metal disk coated or vapor-deposited with a magnetic material is incorporated in a reading device (not shown) in a non-detachable manner. The HD 43 stores programs installed in the DF device 12 (including application programs as well as OS (operating system) and the like) and data. It is also possible to cause the OS to provide a GUI (Graphical User Interface) that can use the graphics for displaying information to the examiner and perform basic operations using the input device 37a.

  Examples of the input device 44 include a keyboard and a mouse that can be operated by an operator, and an input signal according to the operation is sent to the CPU 41. The input device 44 is mainly composed of a main console and a system console.

  The communication control device 45 performs communication control according to each standard. The communication control device 45 has a function capable of connecting to the network N through a telephone line. The DF device 12 can be connected to the network N via the communication control device 45.

  The projection data storage unit 51 stores the projection data output from the A / D conversion circuit 28 c of the C arm holding device 11 under the control of the CPU 41.

  Under the control of the CPU 41, the image processing unit 52 performs logarithmic conversion processing (LOG processing) on the projection data stored in the projection data storage unit 51, and performs addition processing as necessary to obtain data of a fluoroscopic image or DA image. Is generated. The image processing unit 52 performs image processing on the image data stored in the image data storage unit 53. Examples of the image processing include enlargement / gradation / space filter processing for image data, minimum / maximum value tracing processing for image data accumulated in time series, and addition processing for removing noise. The image data after the image processing by the image processing unit 52 is output to the display device 54 and stored in a storage device such as the image data storage unit 53.

  The image data storage unit 53 stores the image data output from the image processing unit 52 under the control of the CPU 41.

  Under the control of the CPU 41, the display device 54 includes image information generated by the image processing unit 52, examination information such as a patient name (parameter character information and scales, etc.), a filming concept image and a film elapsed number image, which will be described later. And the synthesized signal is displayed as a video signal after D / A (digital to analog) conversion.

  FIG. 3 is a block diagram illustrating functions of the X-ray image diagnostic apparatus according to the present embodiment.

  When the CPU 41 shown in FIG. 2 executes the program, as shown in FIG. 3, the X-ray image diagnostic apparatus 10 includes an image acquisition control unit 61, an image level calculation unit 62, an X-ray condition control unit 63, and an X-ray condition. It functions as the fixing unit 64 and the image compensation unit 65. In addition, although each part 61 thru | or 65 is demonstrated as what is provided as a function of the X-ray image diagnostic apparatus 10, all or one part of each part 61 thru | or 65 is provided in the X-ray image diagnostic apparatus 10 as hardware. There may be. Further, all or a part of each of the units 61 to 65 may be provided in the controller 30.

  The image acquisition controller 61 controls the high voltage supply device 31, the drive mechanism 32, and the like via the controller 30 without changing the positions of the X-ray irradiation device 27 and the image receiving device 28 (without moving the C arm 26). ) It has a function of causing the image processing unit 52 to collect fluoroscopic image data or DA image data by causing the top plate 24 to move in the long axis direction and executing fluoroscopy or DA imaging. The image data collected by the control of the image collection control unit 61 is stored in the image data storage unit 53.

  The image level calculation unit 62 performs image processing based on each luminance value (pixel value) in the measurement ROI on the image generated by the image processing unit 52 while the image collection control unit 61 performs fluoroscopy or DA shooting. A function of appropriately calculating the image level in the measurement ROI. The image level in the measurement ROI is luminance information in the ROI obtained from the luminance value of each pixel in the ROI (a representative index value, for example, an average value of luminance values of each pixel in the ROI).

  The X-ray condition control unit 63 has a function of causing the image acquisition control unit 61 to perform image acquisition in accordance with a changing X-ray condition based on ABC as feedback control while the image acquisition control unit 61 performs fluoroscopy or DA imaging. . In the ABC, the timing of the next image collection (the part of the next image collection) so that the image level in the measurement ROI on the image appropriately calculated by the image level calculation unit 62 substantially matches the preset image level. X-ray conditions (tube voltage and tube current) are appropriately determined. Note that the size and position of the measurement ROI set by the operator via the operation unit 11 can be changed in real time so that the measurement ROI is located in the region of interest.

  The X-ray condition control unit 63 has a function of causing the image acquisition control unit 61 to perform image acquisition according to the fixed X-ray condition after the X-ray condition is fixed by the X-ray condition fixing unit 64.

  The X-ray condition fixing unit 64 has a function of fixing an X-ray condition appropriately determined by the X-ray condition control unit 63 when an input signal input by the operator via the operation unit 33 is input. The fixing of the X-ray condition by the operation unit 33 can be set at an arbitrary timing, and the operator can set the X-ray condition at an arbitrary timing while viewing the image of the contrast blood vessel displayed on the display device 54 in real time. Each time a series of acquisition cuts (sequences) is completed, the X-ray condition fixed by the X-ray condition fixing unit 64 is canceled and reset to the ABC state.

  FIG. 4A to FIG. 4D are diagrams showing DA images collected by a conventional X-ray image diagnostic apparatus. FIGS. 5A to 5D are diagrams showing DA images generated by fixing the X-ray conditions by the X-ray condition fixing unit 64 during a series of collection cuts.

In the conventional X-ray diagnostic imaging apparatus, the first part (first frame) R1, the second part (second frame) R2, the third part (third frame) R3, and the fourth part of the lower limbs of the patient P (Fourth frame) By imaging all of R4 under the changing X-ray condition by ABC, the image i _R1 of the first part R1 shown in FIG. 4A and the second part R2 shown in FIG. image _{i R2,} are continuously collected in order of image _{i R3,} and the image _{i R4} of the fourth region R4 shown in FIG. 4 (d) of the third part R3 shown in FIG. 4 (c) from the upper side. On the other hand, in the X-ray diagnostic imaging apparatus 10 according to the present embodiment, the X-ray condition is fixed by the X-ray condition fixing unit 64 in the middle of a series of collection cuts. Each of the images is taken under a fixed X-ray condition according to FIG. 5A. The image I _R1 of the first part R1 shown in FIG. 5A, the image I _R2 of the second part R2 shown in FIG. 5B, and FIG. image _{I R3} of the third portion R3 shown in), and is continuously collected from the top side in the order of the image _{I R4} of the fourth region R4 shown in FIG. 5 (d).

According to the conventional X-ray diagnostic imaging apparatus, in the image i _R2 shown in FIG. 4B, the direct X-ray part is included in the measurement ROI. X-ray condition of the X-ray irradiation is small, including the image i _R3 entire image level direct X-ray portion is reduced. In the conventional X-ray diagnostic imaging apparatus, when an image such that X-rays are directly incident on the measurement ROI is collected, it is controlled to irradiate a small X-ray condition to the next image collection site. It is.

On the other hand, according to the X-ray image diagnostic apparatus 10 of the present embodiment, after collection of the image I _R1 about the first portion immediately before the direct X-rays are generated between the legs, the X-ray condition fixing unit 64, the X-ray condition fixing Let Therefore, after the X-ray condition is fixed by the X-ray condition fixing unit 64, the entire image level including the direct X-ray portion is increased as compared with the conventional X-ray image diagnostic apparatus. Since the X-ray condition fixing unit 64 fixes the X-ray condition, the X-ray condition is smaller than that of the first part R1 even in the second part R2 where the direct X-rays between both legs are remarkably incident. This is because, as shown in FIGS. 5 (b) to 5 (d), the X-ray condition for both legs that are the region of interest of the operator is maintained.

  The image compensation unit 65 illustrated in FIG. 3 includes at least one of a gain adjustment unit 651 and an X-ray condition adjustment unit 652. When the image compensation unit 65 includes both the gain adjustment unit 651 and the X-ray condition adjustment unit 652, the operator can select either one when the X-ray condition is fixed by the X-ray condition fixing unit 64.

  When the X-ray condition is fixed by the X-ray condition fixing unit 64, the gain adjustment unit 651 is approximately the image level in which the image level in the measurement ROI on the image that is appropriately calculated by the image level calculation unit 62 is set in advance. It has a function of adjusting the gain of the TV camera 28b (or FPD when the image receiving device 28 includes FPD) at the next image collection site so as to match. Alternatively, when the X-ray condition is fixed by the X-ray condition fixing unit 64, the gain adjustment unit 651 has an image level in which the image level in the measurement ROI on the image appropriately calculated by the image level calculation unit 62 is set in advance. The image processing unit 52 has a function of adjusting the gain of an image generated at the next image collection site so as to substantially match. The gain adjusting unit 651 compares the image level set in advance for performing ABC with the image level in the measurement ROI on the image appropriately calculated by the image level calculating unit 62, and compares the compared image levels. The reciprocal of the difference ratio is the gain value.

Generally, there is a difference in body thickness between parts included in the lower limbs. For example, there is a difference between the body thickness of the patient P in the second region R2 and the body thickness of the patient P in the third region R3. Therefore, when fixing the X-ray condition after acquisition of the image _{I R1} by the X-ray condition fixing portion 64, but as the image _{I R2} of the second portion R2 is a proper X-ray condition as the image _{I R3} of the third region R3 May be a somewhat excessive X-ray condition. That case, the image level is large image I _R3 of the entire image I _R3 is too bright visually. Therefore, the gain adjustment unit 651 is configured to adjust the gain of the TV camera 28b via the controller 30 according to the image level in the measurement ROI on the image that is appropriately calculated by the image level calculation unit 62 after being fixed by the X-ray condition fixing unit 64. Adjust as appropriate. By adjusting the gain by the gain adjusting unit 651, the image level of the entire image can be kept constant even after the X-ray condition is fixed by the X-ray condition fixing unit 64.

  When the X-ray condition is fixed by the X-ray condition fixing unit 64, when the image level calculation unit 62 appropriately calculates the image level in the measurement ROI on the image, the measurement on the image after fixing the X-ray condition. If the X-ray is directly included in the ROI, it is difficult to obtain an appropriate image level for the image of the next part. Therefore, the image level calculation unit 62 may exclude pixel values in the measurement ROI that exceed a preset upper limit image level threshold from the image level calculation targets.

  When the X-ray condition is fixed by the X-ray condition fixing unit 64, the X-ray condition adjusting unit 652 is fixed by the X-ray condition fixing unit 64 according to the X-ray condition input by the operator via the operation unit 33. It has a function of adjusting X-ray conditions.

  Here, in the X-ray image diagnostic apparatus 10, the X-ray condition is fixed by the X-ray condition fixing unit 64, so that the image level of the entire image becomes higher than that of the conventional X-ray image diagnostic apparatus. Therefore, since the image value of the direct X-ray portion is very high, it is assumed that the visual contrast in the measurement ROI is affected. Therefore, the image compensation unit 65 is configured to compensate for a visual contrast reduction on the image by replacing pixel values exceeding the upper limit image threshold level of the image generated by the image processing unit 52 with, for example, 0 count values. Also good.

  6A to 6D are diagrams showing DA images generated by replacing pixel values exceeding the upper limit image threshold level with 0 count values by the image compensation unit 65 during a series of collection cuts. .

  Each image in FIGS. 6A and 6B is the same image as each image in FIGS. 5A and 5B. 6C and 6D are images in which the pixel values exceeding the upper limit image threshold level in each of the images in FIGS. 5C and 5D are replaced with, for example, 0 count values. Respectively. According to the images shown in FIGS. 6C and 6D, the visibility is improved.

  In the X-ray diagnostic imaging apparatus 10, I.D. I. The visual field size of 28a (FPD) may be changed. When changing the visual field size, the number of photons incident on one pixel changes, so it is necessary to change the X-ray condition, and the X-ray condition control unit 63 controls the X-ray condition. Therefore, when the visual field size is changed, the X-ray condition control unit 63 determines the visual field size for the X-ray condition fixed by the X-ray condition fixing unit 64 and the X-ray condition adjusted by the image compensation unit 65. Multiply by the sensitivity coefficient to change the X-ray condition for each.

  According to the X-ray image diagnostic apparatus 10 of the present embodiment, when fluoroscopy or DA imaging is performed on a part that directly detects X-rays, such as the lower limbs, the X-ray condition fixing unit 64 appropriately cancels ABC and X-rays. An image suitable for diagnosis can be provided by fixing the conditions.

DESCRIPTION OF SYMBOLS 10 X-ray image diagnostic apparatus 11 C arm holding apparatus 12 DF apparatus 24 Top plate 27 X-ray irradiation apparatus 28 Image receiving apparatus 30 Controller 33 Operation part 52 Image processing part 61 Image generation control part 62 Image level calculation part 63 X-ray condition control part 64 X-ray condition fixing unit 65 Image compensation unit 651 Gain adjusting unit 652 X-ray condition adjusting unit

Claims (8)

X-ray irradiation means for irradiating X-rays toward a predetermined part of the subject;
An image receiving means for receiving the X-ray;
A top plate on which the subject is placed;
Image generating means for generating an image based on data obtained by the image receiving means while moving the top plate in the major axis direction without changing the positions of the X-ray irradiation means and the image receiving means;
X-ray conditions for the next image acquisition timing are determined so that the image level in the region of interest on the image substantially matches a preset image level, and the X-ray irradiation means is controlled according to the X-ray conditions. Line condition control means;
X-ray condition fixing means for fixing the X-ray condition at a required time;
An X-ray diagnostic imaging apparatus comprising: The X-ray diagnostic imaging apparatus according to claim 1, wherein the X-ray condition fixed by the X-ray condition fixing unit is canceled every time a series of collection cuts are completed. The X-ray condition control unit is configured to multiply a sensitivity coefficient for changing the X-ray condition for each visual field size with respect to the X-ray condition fixed by the X-ray condition fixing unit when the visual field size is changed. The X-ray image diagnostic apparatus according to claim 1 or 2, wherein When the X-ray condition is fixed by the X-ray condition fixing means, the TV camera included in the image receiving apparatus is arranged so that the image level in the region of interest on the image substantially matches the preset image level. The gain adjustment means for adjusting a gain, a gain of a flat panel detector included in the image receiving device, or a gain of the image generated by the image generation means is further provided. X-ray image diagnostic apparatus. 5. The configuration according to claim 4, wherein the gain adjusting unit is configured to exclude a pixel value exceeding a preset upper limit threshold from a calculation target when calculating an image level in a region of interest on the image. X-ray diagnostic imaging equipment. The X-ray diagnostic imaging apparatus according to claim 1, further comprising an operation unit that adjusts the X-ray condition when the X-ray condition is fixed by the X-ray condition fixing unit. When the visual field size is changed, the X-ray condition control unit is configured to change the X-ray condition for each visual field size with respect to the X-ray condition adjusted by the gain adjusting unit or the operation unit. The X-ray diagnostic imaging apparatus according to claim 4, wherein the X-ray diagnostic imaging apparatus is configured to multiply by a sensitivity coefficient. The X-ray image diagnosis apparatus according to claim 1, wherein the image generation unit is configured to replace a pixel value exceeding an upper limit threshold on the image with a zero value. .