JP4423854B2 - Radiation imaging equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radiographic image capturing apparatus, and more particularly to a radiographic image capturing apparatus that enables phase contrast imaging.
[0002]
[Prior art]
In general, a radiographic imaging apparatus that uses an action of radiation passing through a substance is widely used for medical image diagnosis, non-destructive inspection, and the like. In particular, for a radiographic image apparatus for mammography used for imaging a specific part, a method has been performed in which an object is fixed and imaged on a subject table integrated with a radiographic image detection member. However, according to this method, the subject is photographed at an actual size, but the contrast of the image does not sufficiently increase, and an image is suitable as a medical photographing apparatus used for reading the fine structure of a specific part of the human body. There was a problem that the vividness was insufficient.
[0003]
Therefore, conventionally, a method of obtaining a phase contrast image using a radiation tube (small focus radiation source with a focal size of 30 to 300 μm) used in a general medical institution is known (for example, see Patent Document 1). . According to this, it is possible to depict a high contrast of the boundary of the subject as compared with a normal image with only absorption contrast, and it is possible to obtain a clearer and higher-definition radiographic image. However, in order to obtain such a phase contrast image, it is necessary to provide a certain distance between the subject and the radiation image information detection member. In addition, taking into consideration the viewpoint of reducing the burden on the subject and the cost of equipment at the medical site, not only the “phase image capture mode” that captures phase contrast images but also images of only normal absorption contrast It is desirable that both the “normal imaging mode” can be performed by the same radiographic image capturing apparatus.
[0004]
Therefore, in the prior art, for example, a radiation image information detection member for absorption contrast is detachably disposed immediately below or directly above a subject table that supports the subject, and the radiation image information detection member is disposed below the subject table. By providing a detection member support that detachably supports the radiation image information detection member for phase contrast is arranged in a state where a certain distance from the subject is provided. Thereby, by switching the installation location of the radiation image information detection member between the detection member support base and the vicinity of the subject base, it is possible to perform imaging in the phase image capturing mode and the normal capturing mode with the same radiation image capturing apparatus. .
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-238871
[0006]
[Problems to be solved by the invention]
However, when imaging in the normal imaging mode, the radiographic image information detection member for phase contrast is not necessary, but the detection member support base stands by at a predetermined position below the subject table. There was a risk of hitting the detection member support when shooting in mode. In particular, when the subject takes a picture while sitting on a chair or a wheelchair, the detection member support base becomes an obstacle, and the picture must be taken in an upright state, which is a burden on the subject.
[0007]
An object of the present invention is to reduce the burden on the subject by preventing the detection member support that supports the radiographic image information detection member for phase contrast from interfering with the subject when photographing in the normal photographing mode. It is.
[0008]
[Means for Solving the Problems]
The radiographic imaging device of the invention according to claim 1 is:
A radiation source;
A subject table that supports the subject so as to face the radiation source;
An absorption image that supports a radiation image information detection member that detects radiation transmitted through a subject so as to be positioned in the vicinity of the subject table and on the opposite side of the radiation source side of the subject when capturing an absorption contrast image. A support base,
A phase image support that supports a radiation image information detection member that detects radiation transmitted through a subject at a position spaced apart from the subject table from the absorption image support when taking a phase contrast image. With a stand,
The phase image support base has a first position for holding a radiation image information detection member so as to face the radiation source; From the irradiation field of the radiation source It is possible to displace to the retracted second position.
[0009]
According to invention of Claim 1, the 1st position where the support stand for phase images hold | maintains a radiographic image information detection member so as to oppose a radiation source, Irradiation field of the radiation source Therefore, when an absorption contrast image is taken, that is, when the phase image support base is not used, the phase image support base can be retracted if the phase image support base is retracted. The support table can be prevented from interfering with the subject, and the burden on the subject can be reduced.
Further, when the absorption contrast image is taken, if the phase image support base is retracted from the radiation field of the radiation source, even if the phase image support base remains supporting the radiation image information detection member, The radiation image information detecting member is not irradiated with radiation. For example, when a radiation image information detecting member having a silver halide photographic film is used, it is possible to prevent the silver halide photographic film from being wasted.
[0010]
The invention described in claim 2 is the radiographic imaging apparatus according to claim 1,
The phase image support base detachably supports the radiation image information detection member.
[0011]
According to the second aspect of the present invention, since the radiation image information detection member is detachably supported on the phase image support base, when the absorption image is taken, the radiation image information detection member is removed. Even if the phase image support is not retracted from the radiation field of the radiation source, for example, when a radiation image information detecting member having a silver halide photographic film is used, the silver halide photographic film is wasted. Can be prevented.
[0012]
The invention according to claim 3 is the radiographic imaging device according to claim 1 or 2,
Said Phase image support A support member for supporting
The phase image support is detachably attached to the support member.
[0013]
According to the invention described in claim 3, the same effect as that of the invention described in claim 1 or 2 can be obtained.
[0014]
Invention of Claim 4 is a radiographic imaging apparatus as described in any one of Claims 1-3,
The phase image support is tiltable.
[0015]
According to the fourth aspect of the present invention, since the phase image support table is tiltable, the phase image support table can be moved to a position that does not interfere with the subject without removing the phase image support table. Can be moved. That is, the phase image support can be retracted to a position that does not interfere with the subject without performing the detachment work, and the burden on the operator can be reduced. Further, since it is not necessary to remove the phase image support base, it is not necessary to secure a storage place for the phase image support base.
[0016]
Invention of Claim 5 is a radiographic imaging apparatus as described in any one of Claims 1-4,
The phase image support base is provided to be extendable and contractible. When in the first position, it is in an expanded state, and when in the second position, it is in a contracted state. It is characterized by that.
[0017]
According to the fifth aspect of the present invention, the phase image support base is provided to be extendable and contractible. When in the first position, it is in an expanded state, and when in the second position, it is in a contracted state. Therefore, when the phase image support is extended Is If a phase contrast image can be taken and contracted, the subject can be kept out of the way. Thus, since it is not necessary to remove the phase image support, the same effect as that of the invention of claim 4 can be obtained.
[0018]
Invention of Claim 6 is a radiographic imaging device as described in any one of Claims 1-5,
The phase image support is movable along the irradiation direction of the radiation source.
[0019]
According to the sixth aspect of the present invention, the phase image support base moves along the irradiation direction of the radiation source. Therefore, if the phase image support base is moved away from the subject base, not only the phase contrast image is photographed but also the absorption contrast image. In the case of photographing the radiation, the radiation can be detected by the radiation image information detecting member supported by the phase image support.
Further, when the absorption contrast image is taken, that is, when the phase image support base is not used, the phase image support base can be retracted to prevent the phase image support base from interfering with the subject. .
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view of a radiographic image capturing apparatus 1 according to the present invention.
[0021]
In the present embodiment, the photographing unit 2 is supported by a support shaft 4 provided on the support base 3 and vertically moved within a certain range along a guide rail (not shown) provided on the support member 5 by a drive device (not shown). It is attached to the support member 5 so as to be movable. A radiation operation panel 37 having a key for selecting an imaging mode is connected to the support base 3, and a power source 36 that is a power source of the apparatus is connected to the support base 3.
[0022]
A radiation source 6 for irradiating radiation is provided on the upper part of the imaging unit 2, and an X-ray tube having a focal point of 30 to 3000 μm used in a general medical institution is used as the radiation source 6. Specifically, a radiation tube that emits radiation having a radiation wavelength of about 1 mm is used. This radiation tube is irradiated with radiation by accelerating electrons generated by thermal excitation with a high voltage and colliding with the cathode, thereby converting the kinetic energy into radiation energy. When a radiographic image is taken, the acceleration voltage is set as a tube voltage, the amount of electrons generated as a tube current, and the radiation irradiation time is set as an exposure time. By changing the type of the anode (counter cathode) with which electrons collide, such as copper, molybdenum, rhodium, and tungsten, the radiation energy spectrum to be irradiated can be changed. When copper, molybdenum, rhodium, etc. are used as the anode, a relatively low-energy line spectrum with a narrow radiation energy distribution can be obtained, and this characteristic can be used for mammography to interpret radiation diffraction crystal analysis and fine structures. It is done. When tungsten is used as an anode, it is a broad spectrum of relatively high-energy radiation, which is used for non-destructive inspection of the human chest, abdomen, head, and general industries. The medical or industrial use is characterized by a large radiation dose. In this case, the anode generates heat to collide a large amount of electrons with the anode at a high speed, and the anode may melt at a high temperature. Avoidance is done. That is, it is common to use a rotating anode. Since the imaging apparatus of this embodiment is an apparatus used for the purpose of medical use or nondestructive inspection, a radiation tube having a rotating anode of molybdenum, rhodium, or tungsten is desirable.
[0023]
Here, the focal point of the radiation is, for example, a window viewed from the direction of the subject from which radiation generated by electrons colliding with the rotating anode of the radiation tube is extracted. In general, this is a square, and the length of one side is the focal size. If the shape of the focal point is a circle, its diameter is indicated, and if it is a rectangle, its short side is indicated. As a method for measuring the focal size, a method using a pinhole camera and a method using a micro test chart are described in JIS Z 4704. Normally, the focal spot size is a value based on the measurement of the radiation tube manufacturer and is indicated in the product specification.
[0024]
In order to obtain a clear image with no blur, it is necessary to irradiate a certain amount of radiation. Therefore, the lower limit value of the focal point size of the radiation is determined, and the boundary of the subject 8 caused by the refraction of the radiation is determined. In order to obtain a sharp image by realizing edge enhancement (phase contrast enhancement) that is a part in an optimum state, the distance between the subject 8 and the radiation image information detecting member, the distance from the focus to the subject 8, or radiation physical characteristics From this, the upper limit of the focal spot size is determined. Therefore, in order to perform phase contrast imaging in a normal medical facility, the focus size needs to be 30 μm or more and 300 μm or less, and the focus size is preferably 30 μm or more and 200 μm or less.
[0025]
Next, on both side surfaces of the imaging unit 2, grip rods 9 are provided for the subject to support the body, and the subject extends below the radiation source 6 and extends vertically from the radiation source 6. A subject table 10 that supports 8 from below and a compression plate 11 that compresses and fixes the subject 8 from above are arranged to be movable up and down. The subject table 10 is preferably a rectangular frame or a transparent thin plastic plate attached to the frame.
[0026]
In the present embodiment, the detection member support base 13 is attached to the support member 5 at a plurality of positions at positions that extend below the subject base 10 and extend substantially perpendicularly from the radiation source 6 so as to face the radiation source 6. ing. Each detection member support 13 is detachably mounted with a radiation image information detection member (not shown) as means for detecting radiation image information based on the radiation transmitted through the subject 8. . The radiation image information detection member has an area necessary for detecting the radiation that passes through the subject 8, and the radiation irradiated from the radiation source 6 passes through the subject 8 and the radiation energy ( Radiation image information).
[0027]
Among the plurality of detection member support bases 13, an absorption image support base 13 a that supports the radiographic image information detection member so as to be in close contact with the lower surface of the subject base 10 when capturing an absorption contrast image, and a phase contrast image When imaging a phase image support, the phase image support member supports the radiation image information detection member at a predetermined interval from the subject table 10 so that at least a part of the radiation image information detection member is disposed in the irradiation field of the radiation source 6. 13b and 13c.
[0028]
The absorption image support base 13a and the phase image support bases 13b and 13c are opposed to the subject base 10 during use by driving means (not shown), and rotate around the base end portion during standby to support the distal end portion as a support member. It is retractable so that it is close to 5 and retracted outside the radiation field.
[0029]
Thus, since the phase image support bases 13b and 13c are retractable, the phase image support bases 13b and 13c can be retracted from the photographing position without removing the phase image support bases 13b and 13c. Can do. That is, the phase image support bases 13b and 13c can be retreated to a position that does not interfere with the subject without performing the attaching / detaching operation, and the burden on the operator can be reduced. Further, since it is not necessary to remove the phase image support bases 13b and 13c, it is not necessary to secure a storage place for the phase image support bases 13b and 13c.
[0030]
In the present embodiment, the absorption image support base 13a and the phase image support bases 13b and 13c are configured to be automatically retracted by the driving means. However, the absorption image support base 13a and the phase image support bases 13b and 13c are configured to be retracted manually without providing the driving means. May be.
[0031]
In the present embodiment, for example, the absorption image support base 13a is disposed on the lower surface of the subject table 10 disposed at a position (R1) separated from the radiation source 6 by 55 to 70 cm. The phase image support 13b is disposed at a position (R2) separated by a distance of 0.5 to 1.5 times, and further below it, and separated to a distance of 0.3 to 1.0 times R1. The phase image support 13c is disposed at the position (R3).
[0032]
In the present embodiment, the absorption image support 13a supports the radiation image information detection member so as to be in close contact with the lower surface of the subject table 10, but the absorption contrast on the opposite side of the subject 8 to the radiation source side. The radiation image information detection member may be supported at any location near the subject table 10 as long as it can capture an image. For example, it may be supported on the upper surface of the subject table 10 or inside the subject table 10. It is done. Even if the object table 10 and the absorption image support table 13a are not provided separately, the object table 10 can function as the absorption image support table 13a by supporting the radiation image information detection member by the object table 10. Good.
[0033]
The radiation image information detection member is provided with a grid (not shown) that blocks scattered light from the radiation source 6 in order to prevent the scattered light from affecting the imaging. As the distance increases, the amount of scattered light decreases and the influence on imaging is reduced. Therefore, the radiation image information detection member attached to the phase image support bases 13b and 13c may not have a grid.
[0034]
Radiation image information detection members include: (1) a combination of a radiation fluorescent intensifying screen and a silver halide photographic film, (2) a fluorescent plate that emits photostimulable light, and (3) converts radiation energy into light. Radiation image information reading device in which a scintillator and an optical semiconductor element for reading the light are two-dimensionally arranged. (4) A photoconductor for directly converting radiation energy into an electric signal and a semiconductor element for reading the electric signal are two-dimensionally arranged. Radiation image information reading device, (5) Radiation image information reading in which a combination of a scintillator for converting radiation into light and a lens for condensing the light on a CCD or CMOS is arranged in one or more sets Equipment or (6) scintillator that converts radiation into light and the light is guided to CCD or CMOS by optical fiber and replaced with electrical signal It can be used a radiation image information reading apparatus.
[0035]
When the radiation image information detection member is as described in (1) or (2) above, a radiation dose detector as a radiation ray detection means may be provided on the back surface of the radiation image information detection member. In addition, when the radiation image information detection member is a so-called flat panel detector as in the above (3) to (6) and the radiation energy can be directly taken out directly, without placing the radiation dose detector, The radiation image information detection member itself may have the same function as the radiation dose detector.
[0036]
In the present embodiment, the radiation image information detecting member as an assembly of a radiation fluorescent intensifying screen and a silver halide photographic film as shown in (1) is also called an SF system (screen film system). The radiation fluorescent intensifying screen has a rare earth phosphor such as calcium tungstate or gadolinium oxysulfide, and replaces the radiation energy with blue or green light emission. In particular, for an intensifying screen using a rare earth phosphor, the technique disclosed in Japanese Patent Laid-Open No. 6-67365 may be used. In addition, it is preferable to use a silver halide photographic film in which a photosensitive emulsion is coated only on one side of the support or a photosensitive emulsion coated on both sides of the support. In particular, in the case of a double-sided film, it is a preferred embodiment to use a photographic light-sensitive material in which the photographic characteristics of the respective emulsion layers sandwiching the film support are different. It is also preferable to use a photographic film having a layer that absorbs crossover light between the respective emulsion surfaces of the double-sided film. The size of the single-sided and double-sided film used in the present embodiment can be any size film from six-cut size to half-cut size. These silver halide photographic light-sensitive materials are outlined in Japanese Patent Application Laid-Open No. 6-67365, for example, “Revised Basics of Photographic Engineering—Silver Salt Photo Edition” (Japan Photographic Society Corona, 1998). For photographic film development processing, the average gradation can be increased by raising the development temperature or extending the processing time, but in principle when developing automatically, the development conditions specified by the film manufacturer It is preferable to treat with.
[0037]
The fluorescent plate that emits stimulating light as described in (2) above is one in which visible light emission corresponding to the radiation intensity already irradiated is induced by irradiation with infrared light or visible light after irradiation. That is, a stimulable phosphor plate is placed as a radiation image information detection member, and after irradiation, this phosphor plate is transferred to a laser reader to read the stimulated emission, and the read emission is replaced with an electrical signal by a photomultiplier tube. The electrical signal is obtained. This electrical signal is subjected to appropriate image processing and then displayed on an image display means such as a monitor, or a hard copy of a radiation image is obtained using an image output means such as a laser imager. At this time, if the image has been enlarged, it can be automatically restored to the actual size by inputting the enlargement ratio in advance and displayed on a monitor or output to a hard copy. Regarding the radiation image information detecting member using the photostimulable phosphor, the phosphor disclosed in Japanese Patent Application No. 11-49080 and image visualization technology such as photostimulated luminescence reading can be used in this embodiment. it can.
[0038]
The radiation image information detecting member of the type that converts the radiation described in (3) to (6) above into an electrical signal is disclosed in Japanese Patent Application No. 11-49080 or “Handbook of Medical Imaging” Vol. The technology disclosed in Chapter 1, “Flat panel images for digital radiography” (ed. R. V. Matter et al., SPIE Press, Bellingham, 2000) can be used in this embodiment. In these cases, the radiation image information detection member may also serve as a radiation dose detector, and appropriately processes the electrical signal of the radiation image obtained by the radiation image information detection member and displays it on a monitor or hard copy. An image is drawn on the image and used for diagnostic imaging.
[0039]
In addition, when performing magnified shooting in the “phase image shooting mode” for obtaining a phase contrast image, when outputting the obtained radiation image on a hard copy such as a monitor or photographic film, the actual size of the subject ( It is also possible to display the image automatically returned to the same size.
[0040]
Hard copies include those in which an image can be obtained by developing with an automatic processor using a silver halide photographic light-sensitive material, or a silver halide photographic light-sensitive material that is heated after being exposed to laser light in accordance with radiation image information. Those in which development is performed by the method described above, and those in which an image is drawn by heating in accordance with radiation image information are also preferred embodiments. Also, a solid ink jet recording method that draws an image by ejecting liquid ink heated from solid ink at room temperature, an ink jet recording method that draws an image by ejecting a dye or pigment that is liquid at room temperature from a nozzle, an ink ribbon Hard copy by sublimation by heating and drawing on an image by adhering to a recording medium, ablation image forming method by overheating evaporation of a sheet coated with carbon etc. with laser light etc. based on image information can do.
[0041]
Moreover, the radiographic imaging device 1 in this embodiment is provided with a control device that controls each unit. The control device is connected to a radiation source 6, a compression plate 11, driving means for the detection member support base 13, and a radiation operation panel 37 as an input device for inputting an imaging mode. In the radiation operation panel 37, a “normal imaging mode” is performed by mounting the radiation image information detection member on the absorption image support base 13a, and “first” is performed by mounting the radiation image information detection member on the phase image support base 13b. A key for selecting a “phase imaging mode” and a “second phase imaging mode” that is performed by mounting the radiation image information detection member on the phase image support base 13c is provided. A plurality of phase image shooting modes having different shooting modes and magnification rates can be selectively input. An input device using a keyboard, a magnetic card, a barcode, an HIS (hospital information system), or the like may be provided separately from the radiation operation panel 37 as an input device.
[0042]
The control device is connected to an image output device that outputs an image obtained by shooting with a printer or the like, and an image display device that displays the image on a display.
[0043]
Next, a specific procedure for imaging by the radiation image capturing apparatus 1 in the present embodiment will be described.
[0044]
First, the operator attaches the radiation image information detection member to the detection member support base 13 corresponding to the imaging mode of imaging to be performed in the future, and selects the imaging mode from the radiation operation panel 37 using a key.
[0045]
Based on this selection, the control device controls the driving means so that the detection member support base 13 to which the radiation image information detection member is attached faces the subject base 10, and controls the other detection member support bases 13 as radiation sources. Evacuate outside the 6 irradiation field. Specifically, when the “normal photographing mode” is selected, the absorption image support base 13 a is brought into contact with the lower surface of the subject base 10 so as to face the subject base 10, and the phase image support bases 13 b and 13 c. The distal end of the first member is brought close to the support member 5 and retracted from the irradiation field. When the “first phase imaging mode” is selected, the phase image support base 13b is opposed to the subject base 10, and the distal ends of the absorption image support base 13a and the phase image support base 13c are supported by the support member. Close to 5 and retract from the irradiation field. When the “second phase imaging mode” is selected, the phase image support base 13 c is opposed to the subject base 10, and the distal ends of the absorption image support base 13 a and the phase image support base 13 b are attached to the support member 5. Approach and evacuate from the field. The phase image support 13c is slid and contracted when the tip is brought close to the support member 5, and is slid and extended when the radiation image information detection unit is attached.
[0046]
Thereafter, when the subject places the subject 8 on the subject table 10, the control device lowers the compression plate 11 to compress the subject 8 and irradiates radiation from the radiation source 6 to perform radiographic imaging.
[0047]
As described above, according to the radiographic image capturing apparatus of the present embodiment, when the “normal imaging mode”, that is, when the absorption contrast image is captured, the tip portions of the phase image support bases 13 b and 13 c are attached to the support member 5. Approach and retreat so that a space on the opposite side of the subject table 10 from the radiation source side is secured. Thereby, it can prevent that the support stands 13b and 13c for phase images obstruct a test subject. Therefore, an absorption contrast image can be taken even when the subject is sitting on a chair such as a wheelchair, and the burden on the subject can be reduced.
[0048]
Furthermore, if the phase image support bases 13b and 13c are retracted from the irradiation field of the radiation source 6 when an absorption contrast image is taken, the radiation image information detection member is attached to the phase image support bases 13b and 13c. The radiation image information detecting member is not irradiated with radiation even if left untouched. For example, when a radiation image information detecting member having a silver halide photographic film is used, the silver halide photographic film is wasted. Can be prevented. It is possible to prevent the radiation image information detection member from being wasted. In addition, when an absorption contrast image is taken, if the radiation image information detection member is removed, the radiation image information detection member is irradiated with radiation even if the phase image support base is not retracted from the irradiation field of the radiation source. For example, when a radiation image information detecting member having a silver halide photographic film is used, it is possible to prevent the silver halide photographic film from being wasted.
[0049]
It is needless to say that the present invention is not limited to the above embodiment and can be modified as appropriate.
For example, in the present embodiment, although the phase image support bases 13 b and 13 c are relatively moved up and down along the irradiation direction of the radiation source 6 by the support member 5, the phase image support base 13 b does not approach the subject base 10. Although the configuration is such that the phase image support 13b can be brought close to and close to the vicinity of the subject table 10, not only the phase contrast image but also the absorption contrast image can be captured. Radiation can be detected by the radiation image information detection member supported by the support 13b. In the normal photographing mode, the phase image support bases 13b and 13c may be tilted along the support member 5 to raise the support member 5 so as to be housed in the photographing unit 2.
[0050]
In the present embodiment, the phase image support bases 13b and 13c are retractable. However, the phase image support bases 13b and 13c can be attached to and detached from the support member 5 and / or can be extended and retracted. The phase image support bases 13b and 13c may be movable. In the case where the phase image support bases 13b and 13c are provided to be extendable and retractable, when the detection member support base 13 is extended, the radiation image information detection member is disposed in the irradiation field of the radiation source 6 and contracted. It can be in a state that does not interfere with the subject. Further, the phase image support base may be of a retractable type and may be detachably and / or telescopically installed on the support member 5.
[0051]
Further, the support member 5 itself may be detachable from the radiographic image capturing apparatus 1 so that the phase image support bases 13b and 13c are retracted so as not to obstruct the subject.
[0052]
【The invention's effect】
According to the first aspect of the present invention, when capturing an absorption contrast image, that is, when the phase image support is not used, if the phase image support is moved to a position that does not interfere with the subject, A space is secured on the side opposite to the radiation source side of the subject table, the phase image support table can be prevented from interfering with the subject, and the burden on the subject can be reduced.
Further, when the absorption contrast image is taken, if the phase image support base is retracted from the radiation field of the radiation source, even if the phase image support base remains supporting the radiation image information detection member, The radiation image information detecting member is not irradiated with radiation. For example, when a radiation image information detecting member having a silver halide photographic film is used, it is possible to prevent the silver halide photographic film from being wasted.
[0053]
According to the second aspect of the present invention, when an absorption contrast image is taken, the radiation image information can be obtained by removing the radiation image information detection member even if the phase image support base is not retracted from the radiation field of the radiation source. The detection member is not irradiated with radiation. For example, when a radiation image information detection member having a silver halide photographic film is used, it is possible to prevent the silver halide photographic film from being wasted.
[0054]
According to the invention described in claim 3, the same effect as that of the invention described in claim 1 or 2 can be obtained.
According to the fourth aspect of the present invention, since the phase image support table is tiltable, the phase image support table can be moved to a position that does not interfere with the subject without removing the phase image support table. Can be moved. That is, the phase image support can be retracted to a position that does not interfere with the subject without performing the detachment work, and the burden on the operator can be reduced. Further, since it is not necessary to remove the phase image support base, it is not necessary to secure a storage place for the phase image support base.
According to the fifth aspect of the present invention, since the phase image support base is provided to be extendable, the radiation image information detecting member is disposed in the irradiation field of the radiation source when the phase image support base is extended. In this case, a phase contrast image can be taken, and if it is contracted, the subject can be kept out of the way. Thus, since it is not necessary to remove the phase image support, the same effect as that of the invention of claim 4 can be obtained.
According to the sixth aspect of the present invention, not only the phase contrast image but also the absorption contrast image is captured, the radiation is detected by the radiation image information detecting member supported by the phase image support base. Can do.
Further, when the absorption contrast image is taken, that is, when the phase image support base is not used, the phase image support base can be retracted to prevent the phase image support base from interfering with the subject. .
[Brief description of the drawings]
FIG. 1 is a side view of a radiographic image capturing apparatus according to the present invention.
[Explanation of symbols]
1 Radiation imaging equipment
6 Radiation sources
10 Subject table
13a Support stand for absorption image
13b, 13c Phase image support base

Claims (6)

A radiation source;
A subject table that supports the subject so as to face the radiation source;
An absorption image that supports a radiation image information detection member that detects radiation transmitted through a subject so as to be positioned in the vicinity of the subject table and on the opposite side of the radiation source side of the subject when capturing an absorption contrast image. A support base,
A phase image support that supports a radiation image information detection member that detects radiation transmitted through a subject at a position spaced apart from the subject table from the absorption image support when taking a phase contrast image. With a stand,
The phase image support is displaceable between a first position for holding a radiation image information detection member so as to face the radiation source and a second position retracted from an irradiation field of the radiation source. A radiographic imaging device characterized by the above. The radiographic imaging apparatus according to claim 1,
The radiographic image capturing apparatus, wherein the phase image support base detachably supports the radiographic image information detection member. In the radiographic imaging device according to claim 1 or 2,
A support member for supporting the phase image support ;
The radiographic imaging apparatus, wherein the phase image support is detachably attached to the support member. In the radiographic imaging device according to any one of claims 1 to 3,
The radiation image capturing apparatus according to claim 1, wherein the phase image support base is a tiltable type. In the radiographic imaging apparatus as described in any one of Claims 1-4,
The phase image support base is provided to be extendable and contracted, and is in an expanded state when in the first position, and in a contracted state when in the second position. A radiographic imaging device. In the radiographic imaging device according to any one of claims 1 to 5,
The radiographic imaging apparatus according to claim 1, wherein the phase image support is movable along an irradiation direction of the radiation source.

Images