JPS6041557Y2 - X-ray photography device - Google Patents

Description

[Detailed description of the invention] This invention provides an irradiation field regulating means for regulating the divided imaging range in an oblique incidence imaging device or a cross-sectional imaging device that takes photographs by changing the direction of X-ray incidence on the film surface. This is intended to effectively remove overlapping portions of adjacent screens (photographs) that occur during split shooting by arranging them as close as possible to the film surface.

In this kind of oblique-incidence imaging device or cross-sectional imaging device that enables divisional imaging, a divisional imaging mask that regulates the divisional imaging range is disposed in front of the film, and a grid for removing scattered radiation is arranged between the mask and the film. Due to the distance between the film surface and the mask surface for segmented imaging, the distance between the film surface and the mask surface for segmented imaging becomes long, and when performing segmented imaging for tomography or oblique incidence angle imaging, the adjacent images on the film may overlap. This has the disadvantage of wasting film surface.

This invention solves the above problem, and consists of two pairs of variable diaphragm pieces arranged perpendicularly to each other as an irradiation field regulating means for regulating the divided shooting range. A pair of variable aperture pieces are placed close to the film to regulate the irradiation field on the side perpendicular to the direction of movement of the X-ray source, which is a problem in regulating the divided imaging range, and the irradiation field on the side parallel to the direction of movement of the X-ray source. The distance between the irradiation field regulating means and the film can be shortened by arranging another pair of variable diaphragm pieces above the variable diaphragm pieces on the X-ray source side, and by arranging a grid for removing scattered radiation between both variable diaphragms. The present invention is designed to have a small magnification, to enable small divided photography of overlapping parts, and to make the irradiation field regulating means and the grid for removing scattered radiation compact.

The drawings will be explained below.

Figure 1 is a top view of the main parts of the X-ray photography device of this invention.
and I-I' sectional view in Figure a, where 1 is a lower variable diaphragm piece regulating the irradiation field on the side perpendicular to the moving direction of the X-ray source, and 2 is parallel to the moving direction of the X-ray source. An upper variable diaphragm piece for regulating the side irradiation field; 3 is an X-ray imaging window formed in the base; 4 is a grid positioned within the window 3 for removing scattered X-rays; 5 is the variable diaphragm piece 1; A base 2 is movably held, and 6 is an X-ray film.

FIG. 2 is an external view of a cassette telefilm changing device to which this invention is applied.

7 is a mask cover, which is used to block external light.

8 is a housing of the film exchange device.

Inside this housing, there are magazines for storing unphotographed film and photographed film, a pickup mechanism for taking out the film in the unphotographed film magazine, and a film for transporting the taken out film through the photographing position into the photographed film storage magazine. Contains a transport mechanism.

As shown in the cross-sectional view of Figure 1, what is on the top is a pair of variable diaphragm pieces 2 that regulate the irradiation field on the side parallel to the moving direction of the X-ray source, and are movably mounted on the base 5. A grid 4 is swingably attached within the X-ray imaging window 3 (notch).

A pair of variable diaphragm pieces 1 are movably disposed below the base 5 at a position closest to the X-ray film 6 for regulating the irradiation field on the side perpendicular to the moving direction of the X-ray source.

FIG. 3 is a schematic diagram showing the configuration of a conventional device of this type, and 9 is an X
It is the focal point of the source.

As is clear from the figure, on the front side of the film 6 on the X-ray source side, the grid 4 for removing scattered radiation and the mask 1' for regulating the divided imaging range are sequentially arranged as described above, so that the mask 1' and the film 6 The distance between them will inevitably become larger.

Therefore, when moving the X-ray source 9 from X to X' to perform divided imaging by oblique-incidence imaging or by moving the X-ray source 9 continuously from X to X' to perform divided imaging by tomography,
As shown in 3, there were overlapping parts in the adjacent photographs, especially on the side perpendicular to the moving direction of the X-ray source, and the amount of information decreased accordingly, making it impossible to use the film effectively.

In the above, during tomography, the X-ray source 9 and mask 1 are
, the grid 4, and the film 6 are moved relative to each other in opposite directions.

Furthermore, during oblique-incidence imaging, the X-ray source and the imaging mechanism may be moved in opposite directions relative to each other, as in the case of tomography, but it is also possible to fix the imaging mechanism and move only the X-ray source. You can also do this.

As explained above, according to this invention, the irradiation field regulating means for regulating the divided photographing range is composed of two pairs of variable diaphragm pieces arranged perpendicularly to each other, and when photographing on the inner side thereof, the overlapping photographic images are A pair of aperture pieces that regulate the irradiation field on the side perpendicular to the direction of movement of the X-ray source that affects the film are placed close to the film.
Since it is possible to place it in close contact with the film surface, it is possible to obtain photographs that provide clear and accurate information with a small magnification, and there is no overlapping of photographic images during split shooting, and a large amount of useful information can be obtained. This has a practically useful effect for improving the diagnostic effect such as being able to record information.

Furthermore, since the grid for removing scattered radiation is located between the two pairs of variable apertures, it is possible to particularly downsize the imaging unit.

[Brief explanation of the drawing]

Figure 1 shows the configuration of the main parts of the present invention, where a is a top view and b is a top view.
2 is an external view of a cassette-less film changing device to which this invention is applied, and FIG. 3 is a schematic explanatory diagram showing the structure of a conventional device of this type. 1.2... Variable aperture piece, 3... X-ray imaging window, 4... Grid, 5... Variable aperture piece holding base, 6... ...X-ray film, 8...
...Cassette telefilm changing device, 9...
・X-ray source.

Claims (1)

[Scope of utility model registration request] An irradiation field regulating means for regulating the divided imaging range is provided on the front of the film, and the X-ray source is arranged so that it can be moved parallel to the film surface, making it possible to change the direction of X-ray incidence on the film surface. In the X-ray photographing apparatus, the irradiation field regulating means is composed of two pairs of variable diaphragm pieces arranged orthogonally to each other, and the pair of variable diaphragms regulate the irradiation field on the side perpendicular to the moving direction of the X-ray source. pieces are arranged close to the film, and another pair of variable diaphragm pieces for regulating the irradiation field on the side parallel to the moving direction of the X-ray source are arranged on the X-ray source side above the pair of variable diaphragm pieces. An X-ray photographing apparatus further comprising: a grid for removing scattered rays arranged between the variable diaphragm pieces of the two radiators.