JP2006255216A - X-ray diagnostic imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray diagnostic imaging apparatus which can automatically setting an X-ray irradiation field with the use of an X-ray mobile diaphragm device in any arrangement states of an X-ray generation source and of an examination table regardless of the arrangement state, consequently has improved operability. <P>SOLUTION: An X-ray diagnostic imaging apparatus comprises: a movable X-ray diaphragm device 3 for restricting the irradiation area of an X-ray from an X-ray generator 2, the X-ray with which a subject 1 is irradiated; an X-ray plane detector 4 which is arranged to face the X-ray generator 2 and detects the transmission X-ray of the subject 1; a light irradiating device 5 which is arranged close to the X-ray generator and emits light to an area being the same as the X-ray irradiation area; a light detecting device 6 which is arranged on the front surface of the X-ray plane detector 4 and detects the emitted light; an X-ray diaphragm range calculating device 7 for calculating the photographing area of the subject in the X-ray plane detector 4, based on the detected signal; and a movable X-ray diaphragm controller 8 for controlling the movable X-ray diaphragm device 3 within the calculated X-ray diaphragm range. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an X-ray image diagnostic apparatus using a flat detector as an X-ray detector, and more particularly to an X-ray image diagnostic apparatus capable of automatically limiting an X-ray irradiation field on a subject.

In recent years, in order to directly capture an X-ray image as a digital image, an X-ray image diagnostic apparatus using a semiconductor digital X-ray detector capable of obtaining a digital image in real time has been put into practical use.
There are various types of semiconductor digital X-ray detectors. One example is a scintillator that converts X-rays that have passed through a subject into light, and a photodiode that converts light output from the scintillator into electric charge. (E.g., amorphous silicon type), and an X-ray image is obtained by reading the charge of a photodiode via a switching element (e.g., TFT (Thin Film Transistor)). It is called (Flat Panel Detector).
This flat detector has a large number of detectors arranged in a planar matrix that converts electrical signals corresponding to the X-ray dose that has passed through the subject, and the X-ray dose is converted into an electrical signal by each of the detectors. It becomes an image signal.
This electrical image signal is further converted into a digital image signal by an analog / digital converter and output from a flat panel detector. After being input to an image processing device, various image processing is performed and displayed as an X-ray image on a monitor or the like. And used for diagnosis.

  The X-ray flat panel detector configured as described above is capable of detecting X-ray images in real time as described above, and using conventional screen / film detection systems, photostimulable phosphor detectors and image intensifiers. Because it is thinner and lighter than a vessel and is advantageous for miniaturization of the system, it is suitable for X-ray equipment dedicated to radiography including the chest, X-ray fluoroscopy table, cardiovascular X-ray inspection system, mammography machine, etc. Since it has been put into practical use and has the advantage of lower exposure in the future, it is expected to replace the X-ray film system, digital image system using stimulable phosphor, image intensifier and TV camera system.

Even if it replaces the X-ray flat panel detector with such features, the X-ray diaphragm range is optimized by the movable X-ray diaphragm device in order to limit the X-ray field to an appropriate range from the viewpoint of reducing invalid exposure. It is very important to do.
Especially for X-ray flat panel detectors with a large rectangular field of view, it is possible to shoot at a lower dose than the above image intensifiers and films, so an X-ray irradiation field with an X-ray aperture that is highly effective in reducing exposure. This limitation becomes more and more important.

Therefore, conventionally, as disclosed in Patent Document 1, the distance between the focal point of the X-ray tube as the X-ray generation source and the X-ray flat panel detector is detected, and the X-ray is based on the detected distance. The X-ray irradiation area corresponding to the X-ray image detected by the flat detector is projected onto the examination table on which the subject is placed or the subject, and means for adjusting the X-ray irradiation field to the projection area is provided. It was.
JP 2001-340332 A

However, the X-ray diagnostic imaging apparatus disclosed in the above-mentioned Patent Document 1 is an X-ray diagnostic imaging apparatus of the undertable tube type, without irradiating X-rays (without fluoroscopy), the operator irradiates X-rays. This is done to make the region easily visible.
That is, immediately before imaging, the light from the projector attached to the X-ray flat panel detector is projected onto the subject or examination table, and the operator manually confirms the projection area and manually operates the plurality of X-ray diaphragm devices. The position of the aperture lead blade was adjusted to match the X-ray irradiation field with the projection area.
For this reason, it takes a lot of time to adjust the aperture lead blade, which hinders improvement in operability, and further, the range of the X-ray aperture varies depending on the shape of the subject and the imaging region. It has been desired that the aperture of the X-ray diaphragm can be automatically set even under difficult conditions.

  Further, in the X-ray diagnostic imaging apparatus disclosed in Patent Document 1, the X-ray tube is under the examination table on which the subject is placed, and the X-ray flat panel detector is under the examination table. Since it is limited to the table tube type, an X-ray tube on the examination table and an X-ray detector below the examination table that can be used for an overtable tube type have been desired.

  Therefore, the object of the present invention has been made in view of the above circumstances, and the object of the present invention is not limited to the arrangement form of the X-ray generation source and the examination table, and any arrangement form is based on the X-ray movable diaphragm device. An object of the present invention is to provide an X-ray diagnostic imaging apparatus capable of automatically setting an X-ray irradiation field and improving operability.

The X-ray diagnostic imaging apparatus of the present invention for the above object is achieved by the following.
(1) X-ray generation means for irradiating the subject with X-rays, X-ray movable diaphragm means for determining the X-ray irradiation area, and X-ray generation means for transmitting X-rays transmitted through the subject. An X-ray diagnostic imaging apparatus comprising: an X-ray flat panel detector for detecting; and a light irradiation unit that is provided in the vicinity of the X-ray generation unit and irradiates light to the same region as the X-ray irradiation region. A light detecting means for detecting a light signal emitted from the light irradiating means and disposed in front of the line flat detector, and an imaging region of the subject in the X-ray flat detector from the signal detected by the light detecting means; X-ray aperture range calculation means for calculating the X-ray aperture range by the X-ray movable aperture means in the imaging region, and the X-ray aperture range calculated by the X-ray aperture range calculation means in the X-ray aperture range calculation means X-ray movable aperture control means for controlling the means.
A signal input unit configured to perform light detection by the light detection unit and calculation of an X-ray aperture range by the X-ray aperture range calculation unit at an arbitrary timing before starting imaging, and further, the light detection The means is configured by arranging a plurality of visible light detectors on the outer periphery of the visual field of the X-ray flat panel detector.

  Since the X-ray diagnostic imaging apparatus according to the present invention configured as described above can automatically set the X-ray irradiation field by the X-ray movable diaphragm device, the X-ray diaphragm lead blade of the X-ray movable diaphragm device is adjusted. Time is shortened and operability is improved.

(2) The light detection means is formed by arranging the visible light detector at a part of the outer periphery of the field of view of the X-ray flat detector, and the detection surface of the X-ray flat detector is irradiated from the light irradiation means. The light detector moving means for moving the light detecting means while detecting the light is provided.
For example, in the case of an X-ray flat panel detector having four sides, one part of the outer periphery of the field of view of the X-ray flat panel detector is at least one of the four sides. It is the structure which arrange | positions a detector.
As a result, it is not necessary to provide visible light detectors on the entire outer periphery of the field of view of the X-ray flat panel detector, so the number of visible light detectors in the light detection device can be greatly reduced, and the device can be made small and inexpensive. It becomes possible to make things.

(3) The light detection means is configured to provide a groove having a predetermined angle with respect to a light input surface to the X-ray flat panel detector, and to arrange the visible light detector in the groove.
By configuring in this way, it is possible to prevent erroneous detection due to leakage of light from the outside such as room illumination light, so that reliability is improved.

(4) The X-ray diaphragm range calculation means further receives examination part information, and based on the inputted examination part information and the detection signal of the light detection means, the X-ray diaphragm range of the X-ray movable diaphragm device Is calculated.
Accordingly, since the examination site is also considered in setting the X-ray irradiation area, the setting accuracy of the imaging area is further improved, and the exposure reduction is more effective.

(5) The X-ray aperture range calculation means calculates the X-ray aperture range only when light is emitted from the light irradiation means.
Thereby, there is no opportunity to detect light other than light from the light irradiation means, and the accuracy of the X-ray aperture range calculation is improved.

(6) An X-ray diagnostic imaging apparatus according to (1) to (5) above is provided with a screening table on which the subject is placed, and an X-ray diagnostic material such as an acrylic material is used for the screening table. The X-ray plane detector is located above the examination table, the X-ray plane detector is located below the examination table, and the X-ray plane detector is located above the examination table. It can be applied to any type of X-ray diagnostic imaging apparatus of the under-table tube type above.

According to the present invention, the light from the light irradiation means provided in the vicinity of the X-ray generation means is detected by the light detection means arranged on the front surface of the X-ray flat detector to obtain the X-ray irradiation field to the subject. Since the X-ray movable diaphragm means is controlled so as to be in this irradiation field, the X-ray irradiation field can be automatically set, thereby improving the operability.
In addition, by using a light-transmitting material such as an acrylic material for the examination table on which the subject is placed, it can be applied to any type of X-ray diagnostic imaging device of the overtable tube type or the undertable tube type. Become.

Embodiments of the X-ray image diagnostic apparatus of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of the first embodiment in the X-ray diagnostic imaging apparatus of the present invention.
The X-ray diagnostic imaging apparatus according to the first embodiment of the present invention determines an X-ray generation apparatus 2 that generates X-rays to be irradiated on the subject 1, and an X-ray irradiation region that is irradiated to the subject 1 An X-ray movable diaphragm device 3, an X-ray plane detector 4 that is disposed opposite to the X-ray generator 2 and detects transmitted X-rays of the subject 1, and the X-ray generator 2 installed near the X-ray generator 2 A light irradiation device 5 which is a light source for projecting the same region as the X-ray irradiation region on the X-ray flat detector 4, and the light irradiation device 5 which is disposed in front of the X-ray flat detector 4 and irradiated A photodetection device 6 that detects an optical signal and converts it into an electrical signal, and estimates the position of the subject 1 on the X-ray flat panel detector 4 from the electrical signal detected by the photodetection device 6. An X-ray aperture range calculation device 7 for calculating an X-ray aperture range by the movable aperture device 3, and an X-ray aperture range calculated by the X-ray aperture range calculation device 7 It constituted by an X-ray diaphragm control unit 8 for controlling the serial X-ray movable aperture device 3.

The X-ray generation device 2 is an X-ray tube device that emits X-rays irradiated to the subject 1, and the X-ray movable diaphragm device 3 includes an irradiation range (irradiation of the X-rays irradiated to the subject 1). An X-ray apertured lead blade 31 that is movable to the left and right to limit the field) is provided.
For the light irradiation device 5, for example, a light projection standard using a halogen lamp is used. The X-ray generation device 2, the X-ray movable diaphragm device 3, and the light irradiation device 5 are provided in one housing. It is stored in the body and supported by a ceiling suspension support device or a floor support device (not shown).

  The X-ray flat panel detector 4 and the light detection device 6 are arranged as described later and supported by a support device (not shown), and the X-ray aperture range calculation device 7 and the X-ray aperture control device 8 are not shown. It is built in a control device that controls the entire X-ray image diagnostic apparatus, and the components are controlled by control signals from the control device.

  The X-ray image diagnostic apparatus of the present invention shown in FIG. 1 is required to image the subject 1 and the X-ray flat panel detector 4 that do not require an examination table on which the subject 1 is placed. In an example applied to imaging, for example, chest imaging, a standing imaging platform for positioning the subject 1 in a standing posture is omitted.

Next, the operation of the X-ray image diagnostic apparatus according to the first embodiment of the present invention shown in FIG. 1 will be described.
Prior to imaging, the operator irradiates light having a predetermined light beam from the light irradiation device 5 toward the subject 1.
The irradiated light does not pass through the region of the subject 1, but the light in the region other than the subject 1 is detected by the light detection device 6 disposed in front of the X-ray flat panel detector 4, and further the electric signal And is input to the X-ray aperture range calculation device 7.

FIG. 2 is a schematic diagram showing a light detection device 6 configured by arranging a visible light detector 61 disposed in front of the X-ray flat panel detector 4. As shown in FIG.
The hatched area in FIG. 2 represents the effective visual field area A of the X-ray flat panel detector 4, and a plurality of visible light detectors are detected as the light detection device 6 on the outer periphery of the effective visual field area A of the X-ray flat panel detector 4. A container 61 is arranged.
The visible light detector 61 is a semiconductor sensor using a photoconductive effect in which the resistance value decreases when irradiated with light, and is a small non-polar resistance element that approximates the wavelength characteristic (specific sensitivity) of the human eye. There are requirements for constituting the present photodetection device 6.

A plurality of visible light detectors 61 having such characteristics are used to form a light detection device 6, and shown in FIG. 3 in order to be able to efficiently detect light spreading radially from the light irradiation device 5. It has a structure.
In FIG. 3, the visible light detector 61 is disposed in a groove 62 provided in the light detection device 6 with an angle with respect to the input surface of the X-ray flat detector 4, thereby It prevents false detection due to leakage of light from outside such as illumination light.

FIG. 4 is a schematic diagram showing how the visible light detector 61 detects the light emitted from the light irradiation device 5 toward the subject 1.
The visible light detector 61 that detects the light emitted from the light irradiation device 5 is shown in white (marked with □), and the visible light detector 61 that is blocked by the subject 1 and did not detect light is black (marked with ■) Is shown.
The detection results of light by the plurality of visible light detectors 61 (position information of visible light detectors arranged on four sides of the horizontal axis of two sides and the vertical axis of two sides) from the light detection device 6 It is sent to the X-ray aperture range calculation device 7.
In the X-ray aperture range calculation device 7, the insertion position of the X-ray aperture lead blade 31 of the X-ray movable aperture device 3 (shown in black in FIG. 4) based on the detection result of the optical signal sent from the light detection device 6. The area excluding the visible light detector 61 is calculated.

FIG. 5 is a schematic diagram showing how the insertion position of the X-ray diaphragm lead blade 31 of the X-ray movable diaphragm device 3 calculated by the X-ray diaphragm range calculating means 7 is determined.
In FIG. 5, white (□ mark) indicates the position of the visible light detector 61 where light is detected by the light detection means 6, and black (■ mark) is a visible light detector where light cannot be detected by the light detection means 6. 61 positions are shown.
The X-ray aperture range calculation means 7 determines positions that cover all visible light detectors 61 that have detected light, that is, CR and CL in FIG. 5 as insertion positions of the X-ray aperture lead blades 31.
Here, it is assumed that which X-ray aperture lead blades of the X-ray aperture lead blades 31 are inserted with respect to the position where the light is detected is determined in advance according to the inspection target part. .

The X-ray aperture control means 8 controls the insertion of the X-ray aperture lead blade 31 at the position calculated by the X-ray aperture range calculation means 7.
Since these control operations are performed while light is irradiated from the light irradiation device 5 installed in the vicinity of the X-ray generation device 2 toward the X-ray flat detector 4, the operator must It is also possible to visually check whether the blade 31 is controlled to be inserted into the optimum position.

  Further, the X-ray aperture range calculating means 7 determines the insertion position of the X-ray aperture lead blade 31 using the examination site information set by the operator in advance with an operator not shown and the signal detected by the light detection means 6. By calculating, the X-ray irradiation field can be limited to a more appropriate one.

FIG. 6 is a schematic diagram showing how the insertion position of the X-ray aperture lead blade 31 is determined using the examination site information and the signal detected by the light detection means 6.
In FIG. 6, assuming the chest front imaging as the examination site, the position of the visible light detector 61 where light is detected by the light detection device 6 is shown in white (□), and the visible light detector where no light was detected The position 61 is shown in black (■).

The X-ray aperture range calculation means 7 is an exclusion target visible light detector corresponding to the arm of the subject 1 among the visible light detectors 61 that could not detect light when the examination target site is chest front imaging. The insertion positions CL and CR of the X-ray aperture lead blades 31 are calculated from the position of the visible light detector 61 where 63 is excluded from the calculation of the X-ray aperture range and no other light is detected.
It is assumed that the position of the visible light detector 63 to be excluded according to the examination target site is set in advance by an operator using an operating device (not shown).

  By configuring in this way, the X-ray irradiation field by the X-ray movable aperture device can be set automatically, and the operability is further improved.

FIG. 7 is a schematic diagram showing the configuration of the second embodiment in the X-ray image diagnostic apparatus of the present invention.
In FIG. 7, components having functions similar to those of the first embodiment of FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.
The X-ray image diagnostic apparatus of the second embodiment of the present invention shown in FIG. 7 combines four or more visible light detectors 61 in the X-ray image diagnostic apparatus of the first embodiment shown in FIG. The light detection device 6 is a light detection device 6 ′ having one side, and a light detector moving device 9 for moving the light detection device 6 ′ in a direction orthogonal to the X-ray flat panel detector 4 is added.

In the X-ray diagnostic imaging apparatus shown in FIG. 7 having such a configuration, the operator irradiates light toward the subject 1 from the light irradiation apparatus 5 installed in the vicinity of the X-ray generation apparatus 2 before imaging. .
When the detection of the light emitted from the light irradiation device 5 is started by the light detection device 6 ′, the light detector moving device 9 is changed to the X-ray flat detector 4. The light irradiated from the light irradiation device 5 is detected by moving on the incident surface of the X-ray flat panel detector 4 in the orthogonal direction.

FIG. 8 is a schematic diagram showing how the photodetector 6 ′ is moved by the photodetector moving device 9. As shown in FIG.
The light detector moving device 9 includes a mechanism (not shown) that moves the light detecting device 6 ′ in the direction shown in the figure by a driving force such as a motor, and detects the light by the light detecting device 6 ′. The light is detected by moving on the detector 4 from the upper part to the lower part of FIG. 8, and when the light detection is completed, the light detection device 6 ′ is retracted out of the field of view of the X-ray flat panel detector 4. .

FIG. 9 shows how the X-ray aperture range calculation means 7 calculates the insertion position of the X-ray aperture lead blade 31 from the light detection result after the movement control of the photodetector 6 ′ by the photodetector moving device 9. It is a schematic diagram shown.
The light detection device 6 ′ detects light at regular time intervals while moving by the light detector moving device 9, and the white visible light detector (□ mark) in FIG. 9 is the detection position where the light is detected, The black visible light detector (marked with ■) indicates the position where it was not detected.
The insertion positions CR, CL, and CT of the X-ray aperture lead blade 31 are determined based on these detection results and a preset inspection target site.
The X-ray diaphragm control device 8 controls the insertion of the X-ray diaphragm lead blade 31 at the position calculated by the X-ray diaphragm range calculation device 7.

  By configuring in this way, it is not necessary to provide the visible light detector 61 over the entire circumference of the X-ray plane detection 4, so the number of visible light detectors of the light detection device 6 ′ is greatly reduced and the size is reduced. Can be cheap, too.

FIG. 10 is a schematic diagram showing the configuration of the third embodiment in the X-ray image diagnostic apparatus of the present invention.
In FIG. 10, components having functions similar to those of the first embodiment of FIG. 1 and the second embodiment of FIG. 7 are denoted by the same reference numerals, and description thereof is omitted.
The X-ray image diagnostic apparatus according to the third embodiment of the present invention shown in FIG. 10 is the same as the X-ray image diagnostic apparatus according to the second embodiment shown in FIG. An X-ray aperture range calculation start signal input device 10 for starting the light detection and starting the calculation of the insertion position of the X-ray aperture lead blade 31 by the X-ray aperture range calculation device 7 is added.

The X-ray diagnostic imaging apparatus according to the third embodiment of the present invention shown in FIG. 10 operates as follows.
In FIG. 10, during the control of the X-ray movable diaphragm device 3 by the X-ray diaphragm controller 8, the operator does not control the insertion of each lead blade of the X-ray movable diaphragm device 3 to the optimum position due to the movement of the subject 1 or the like. Is determined, the operator inputs a light detection start signal from the X-ray aperture calculation range start signal input device 10 to the light detection device 6 ′ and an X-ray aperture range calculation start signal to the X-ray aperture range calculation device 7.

When the light detection start signal is input, the light detection means 6 ′ detects again the light emitted from the light irradiation means 5, and the detection result is sent to the X-ray aperture range calculation device 7.
The X-ray aperture range calculation device 7 calculates again the insertion position of the X-ray aperture lead blade 31 of the X-ray movable aperture device 3 from the optical signal detection result, and sends this calculation result to the X-ray aperture control device 8.
When the X-ray diaphragm control device 8 detects that the insertion position of the X-ray diaphragm lead blade 31 has been sent again from the X-ray diaphragm range calculation device 7, the insertion control operation of the currently controlled X-ray diaphragm lead blade 31 is performed. And the insertion control of each lead blade 31 of the X-ray diaphragm of the X-ray movable diaphragm device 3 is performed at the insertion position of the X-ray diaphragm lead blade 31 sent again from the X-ray diaphragm range calculation device 7.
As a result, it is possible to always insert the X-ray aperture lead blade 31 into the optimum position according to the judgment of the operator with respect to the movement of the subject 1 during the control of the X-ray aperture lead blade 31.

  The X-ray image diagnostic apparatus of the present invention shown in FIG. 1, FIG. 7 and FIG. 10 does not require an examination table on which the subject 1 is placed. For example, the X-ray diagnostic imaging apparatus is applied to chest imaging. The X-ray generator is located on the examination table on which the subject is placed and the X-ray flat panel detector is not limited to this. X-ray images of either the over-table tube type under the examination table and the under-table tube type where the X-ray generator is under the examination table and the X-ray flat panel detector is above the examination table It can also be applied to a diagnostic device.

1 is a schematic diagram showing the configuration of a first embodiment in an X-ray image diagnostic apparatus of the present invention. The schematic diagram which shows the optical detection apparatus which has arrange | positioned and comprised the visible light detector arrange | positioned at the front surface of a X-ray flat detector. The schematic diagram which shows the mode of arrangement | positioning of the visible light detector which comprises a photon detection apparatus. The schematic diagram which shows a mode that the light irradiated toward the subject from the light irradiation apparatus is detected with a visible light detector. The schematic diagram which shows a mode that the insertion position of the X-ray aperture lead blade of the X-ray movable aperture device calculated by the X-ray aperture range calculation means is determined. The schematic diagram which shows a mode that the insertion position of a X-ray aperture lead blade | wing is determined using test | inspection site | part information and the signal detected with the optical detection apparatus. FIG. 4 is a schematic diagram showing the configuration of a second embodiment in the X-ray image diagnostic apparatus of the present invention. The schematic diagram which shows the mode of a movement of the photon detection apparatus by the photon detector movement apparatus. The schematic diagram which shows a mode that the insertion position of an X-ray aperture lead blade | wing is calculated by the X-ray aperture range calculation means in 2nd Embodiment. FIG. 5 is a schematic diagram showing a configuration of a third embodiment in the X-ray image diagnostic apparatus of the present invention.

Explanation of symbols

  1 subject, 2 X-ray generator, 3 X-ray movable aperture device, 4 X-ray flat panel detector, 5 light irradiation device, 6, 6 'light detection device, 7 X-ray aperture range calculation device, 8 X-ray aperture control Device, 9 light detector moving device, 10 X-ray aperture range calculation start signal input device, 31 lead blade, 61 visible light detector, 62 groove, 63 exclusion target visible light detector

Claims (4)

X-ray generation means for irradiating the subject with X-rays;
X-ray movable aperture means for determining the X-ray irradiation area;
An X-ray flat panel detector disposed opposite to the X-ray generation means for detecting transmitted X-rays of the subject; and light that irradiates light in the same area as the X-ray irradiation area provided in the vicinity of the X-ray generation means An X-ray diagnostic imaging apparatus comprising an irradiating unit, wherein the optical detecting unit is disposed in front of the X-ray flat panel detector and detects an optical signal irradiated from the light irradiating unit;
X-ray aperture range calculation for obtaining an imaging region of the subject in the X-ray flat panel detector from the signal detected by the light detection means and calculating an X-ray aperture range by the X-ray movable aperture means in the imaging region Means,
X-ray movable diaphragm control means for controlling the X-ray movable diaphragm means within the X-ray diaphragm range calculated by the X-ray diaphragm range calculating means;
An X-ray diagnostic imaging apparatus comprising:   2. The X-ray image diagnostic apparatus according to claim 1, further comprising a signal input unit for performing light detection by the light detection unit and calculation of an X-ray aperture range by the X-ray aperture range calculation unit at an arbitrary timing. .   2. The X-ray diagnostic imaging apparatus according to claim 1, wherein the light detection means includes a visible light detector arranged on the outer periphery of the visual field of the X-ray flat panel detector.   3. The light detection means according to claim 1, wherein the light detection means is configured by arranging the visible light detector on a part of the outer periphery of the field of view of the X-ray flat detector, and further on the detection surface of the X-ray flat detector. An X-ray diagnostic imaging apparatus comprising: a photodetector moving means for moving the light detection means while detecting light emitted from the light irradiation means.

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