JP3114018B1 - Radiation cassette - Google Patents

Abstract

An object of the present invention is to minimize the occurrence of an image loss even in a manufacturing error of a component of a radiation cassette, a degree of insertion of a recording plate, and imaging in a state where the radiation cassette is tilted. SOLUTION: A pair of elastic members 10, 10 are fixed to an inner surface of a holder 4 arranged in a housing space portion 5. The base end of the recording plate 6 in the accommodation space 5 is resiliently elastically struck by the elastic members 10, 10, and the front end of the recording plate 6 is always in contact with the bottom plate 2 d of the cassette body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation cassette used for recording a radiation image on a stimulable phosphor sheet at a medical site such as a hospital, and more particularly, to a breast of a subject called a mammoth cassette. The present invention relates to a radiation cassette suitable for imaging.

[0002]

2. Description of the Related Art As an image recording medium for radiography, a part of radiation energy is stored as an image in a stimulable phosphor layer laminated on a sheet surface, and this is scanned with excitation light to emit light from the radiation image. There is a stimulable phosphor sheet that photoelectrically detects the emitted light and reads the radiation image information by an electric signal. As a radiation cassette for imaging the breast of a subject using the stimulable phosphor sheet. For example, Japanese Patent Application Laid-Open No. 11-
There are those disclosed in JP-A-160820 and JP-A-11-265034.

[0003] These radiation cassettes include a cassette body in which a three-sided peripheral surface of a rectangular front plate and a back plate that are opposed to each other is surrounded by a pair of side plates and a bottom plate, and a housing space portion is formed inside the cassette body. A holder attached to an attachment / detachment hole opened to the other side of the cassette body facing the other side; and a recording plate having a stimulable phosphor sheet adhered to a tray, wherein the recording plate and the holder are detachably attached. In connection with accommodating the recording plate in the accommodation space from the attachment / detachment hole, the holder is attached to the attachment / detachment hole to hermetically cover the accommodation space. With the front plate of the cassette body facing the breast side, apply the bottom plate of the cassette body under the breast, and make the cassette body perpendicular to the subject, or in some cases, slightly inclined, and examine from the opposite side of the cassette body. Radiation to the breast.

In such radiation imaging, the tip of the stimulable phosphor sheet of the recording plate and the tray are set to be flush with each other, and these are brought into contact with the bottom plate of the cassette body, so that the chest wall is included as much as possible. The chest wall side has a thickness of the bottom plate of the cassette body that is unnecessary for shooting, and the breast that is not so thick as a subject straddles this bottom plate so that the cassette body can be photographed. At present, there is a considerable lack of image on the chest wall side of the breast because it is projected on the top plate, and medical X is standardized as an international standard by the International Electrotechnical Commission (IEC).
The X-ray diagnostic cassette “Mammary [X-ray] imaging cassette” stipulates that the distance between the film and the chest wall must not exceed 2 mm.

[0005]

In such a radiation cassette, there is a manufacturing error in a component part, or a holder is fitted into a detachable hole of the cassette body, and the recording plate is pushed into the accommodation space. Depending on the situation, the leading edge of the recording plate may not reach the bottom plate of the cassette body, creating a gap between the leading edge of the stimulable phosphor sheet and the bottom plate of the cassette body, and unnecessarily increasing missing images. was there.

Further, in some radiation cassettes, the holder and the recording plate are connected by a long connecting hole in the insertion / removal direction and a pin fitted therein, so that the connected holder and the recording plate have a movement. However, when the radiation cassette is tilted and photographed with such a connection structure, the gap between the stimulable phosphor sheet and the bottom plate of the cassette body is further expanded, which may cause a large missing image. There is.

The present invention has been made in view of such circumstances, and has as its object to produce a component with a manufacturing error, a recording plate insertion condition, and a photographing method in which a radiation cassette is tilted. An object of the present invention is to provide a radiation cassette capable of always minimizing occurrence of a missing image.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the above-described object, a three-sided peripheral surface of an opposing rectangular front plate and a back plate surrounded by a pair of side plates and a bottom plate to form a housing space therein. A cassette body, a holder attached to an attachment / detachment hole opened on the other side of the cassette body facing the bottom plate, and a recording plate having a stimulable phosphor sheet adhered to a tray. And the holder are detachably connected to each other to accommodate the recording plate in the accommodation space through the attachment / detachment hole, and to mount the holder in the attachment / detachment hole to hermetically cover the accommodation space. In the cassette, on the inner surface of the holder disposed in the accommodation space,
An elastic material is provided for resiliently projecting a base end of the recording plate in the housing space portion and abutting a leading end of the recording plate on a bottom plate of the cassette body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In the drawing, FIG. 1 is a sectional view taken along the line II of FIG.
FIG. 2 is an exploded perspective view of the radiation cassette, FIG. 3 is a partial cross-sectional plan view of the radiation cassette, and FIG.
FIG. 5 is a sectional view taken along a line IV-IV in FIG. 1, and FIG. 6 is a sectional view showing a state where the recording plate is housed in a housing space of a cassette body.

The radiation cassette 1 is provided with a box-shaped cassette body 2, a holder 4 to be mounted in a detachable hole 3 of the cassette body 2, and a detachable engagement with the holder 4, and a housing space for the cassette body 2. And a recording plate 6 housed in the section 5.

The cassette body 2 has a rectangular front plate 2 opposed thereto.
a and the back plate 2b are surrounded by a pair of side plates 2c, 2c and a bottom plate 2d, and the above-mentioned accommodation space 5 is formed therein, and a horizontally long opening facing the bottom plate 2d is formed as described above. And a detachable hole 3. A carbon fiber reinforced resin plate having a thickness of, for example, about 1.2 mm is used for the top plate 2a on the radiation irradiation side over the bottom plate 2d, and the radiation irradiated from the radiation imaging apparatus is recorded without attenuating. Plate 6
To obtain a radiation image as good as possible.

A gap wider than the thickness of the recording plate 6 is set between the front plate 2a and the back plate 2b of the housing space 5, and guide ribs 2e are formed in a lattice pattern on the inner bottom plate side of the back plate 2b. The recording plate 6 accommodated in the accommodation space 5 is linearly held at a substantially intermediate height. Guide grooves 2f are provided inside the side plates 2c, 2c, respectively.
Are recessed so as to keep the recording plate 6 inserted and removed and the storage state in the storage space 5.

The holder 4 includes a frame 7 having a U-shaped cross section, which is mounted in the attachment / detachment hole 3 of the cassette body 2 such that the front plate 2a and the back plate 2b are sandwiched between the rims 7a, 7a. The base 8a is fixed to the inner surface of the web 7b, and the rims 7a, 7
a.
A pair of elastic members 10, 10 are provided on the inner surface of the base 8a of the connecting plate 8.
However, a pair of connecting holes 11, 11 are formed in the connecting plate 8.

The elastic member 10 is made of a synthetic resin foam material formed in a rod shape having a rectangular cross section and adhered to the inner surface of the base 8a. The recording plate 6 housed in the housing space 5 is attached to the bottom plate of the cassette body 2. Used to bias in the 2d direction. The connecting hole 11 is formed as a large-diameter attaching / detaching hole 11a on the protruding piece 8b side and a daruma hole formed on the base 8a side as a narrow elongated hole 11b. The engagement pin 14 is attached and detached, and the engagement pin 14 is prevented from coming off by the narrow elongated hole 11b.

The recording plate 6 has a stimulable phosphor sheet 13 adhered to one side surface of a tray 12 made of a hard synthetic resin, and a pair of engaging pins 1 near a base end of the other side surface of the tray 12.
4, 14 are protruded. When the stimulable phosphor sheet 13 is accommodated in the accommodating space 5, the tip of the chest wall side of the subject is aligned with the tip of the tray 12, thereby minimizing the area where a missing image occurs. Try to keep it low. In addition, the engagement pin 14 of the recording plate 6
Is composed of a small-diameter shaft portion 14a and a large-diameter flange 14b provided around the tip of the shaft portion 14a.

The holder 4 and the recording plate 6 are connected to the connecting hole 1.
The insertion pin 14 is inserted into the attachment / detachment hole 11a of the
And the recording plate 6 are pulled in the separating direction, and the engaging pin 1
4 can be relatively moved within the length range of the connection hole 11 by sliding the shaft portion 14a into the long hole 11b of the connection hole 11 and moving the flange 14b of the engagement pin 14 to the opposite side of the long hole 11b. Linked to By this connection, the elastic members 10, 10, the tray 12, and the stimulable phosphor sheet 13 are located on the same plane.

The recording plate 6 connected to the holder 4 as described above is housed in the housing space 5 of the cassette body 2, the holder 4 is mounted in the mounting hole 3, and the holder 4 is locked (not shown). The housing space 5 is hermetically covered by being locked to the cassette body 2 by means. The recording plate 6 in the accommodation space 5 has a base end provided with the elastic members 10 and 1 of the holder 4.
0, the housing space 5 is urged toward the bottom plate 2d,
The distal end is kept in contact with the bottom plate 2d at all times as shown in FIG.

In this embodiment, the elastic members 10 are adhered to the inner surface of the holder 4 provided in the accommodation space 5 and the recording material 6 is fixed to the elastic members 10 by the elastic members 10. The end of the recording plate 6 is abutted against the bottom plate 2d of the cassette body 2 without any backlash, so that there is a manufacturing error in the components of the radiation cassette 1 or the recording plate 6 is 5 or the radiation cassette 1 is inclined, so that an unnecessary gap is not generated between the stimulable phosphor sheet 13 on the tray 12 and the bottom plate 2d. .

Therefore, when the breast of the subject is imaged with the radiation cassette 1 of the present embodiment, the occurrence of the missing image is caused by the bottom plate 2d.
In the case of the present embodiment, the thickness of the carbon fiber reinforced resin plate can be suppressed to a minimum of 1.2 mm.

As the resilient material of the present invention, a soft synthetic resin or rubber other than the foam material shown in the embodiment, or a spring material such as a helical spring or a leaf spring can be used. Further, the connection between the recording plate and the holder may be performed by a structure other than the above-described embodiment.

[0021]

As described above, according to the radiation cassette of the present invention, the tip of the recording plate can be constantly brought into contact with the bottom plate of the cassette body by the elastic material fixed to the inner surface of the holder. Even if there is a manufacturing error in the components of the radiation cassette, the recording plate is inserted into the receiving space with an inclination, or the radiation cassette is inclined, the tip of the stimulable phosphor sheet may be used. Unnecessary space is not generated between the base plate and the bottom plate.
As a result, the occurrence of a missing image can be minimized mainly in photographing a breast or the like using the leading end side of the stimulable phosphor sheet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along a line II of FIG. 3 showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view of a radiation cassette showing one embodiment of the present invention.

FIG. 3 is a partial cross-sectional plan view of a radiation cassette showing one embodiment of the present invention.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, illustrating one embodiment of the present invention.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 1 showing one embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a state in which a recording plate according to an embodiment of the present invention is housed in a housing space of a cassette main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Radiation cassette, 2 ... Cassette main body, 2a ... Front plate, 2b ... Back plate, 2c ... Side plate, 2d ... Bottom plate, 3 ... Removable hole, 4 ... Holder, 5 ... Housing space part, 6 ... Recording plate,
7 ... frame piece, 8 ... connecting plate, 10 ... elastic material, 11 ... connecting hole,
12: tray, 13: stimulable phosphor sheet, 14: engaging pin

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G03B 42/00-42/04 A61B 6/00

Claims (1)

(57) [Claims] 1. A cassette body in which a three-sided peripheral surface of a rectangular front plate and a back plate facing each other is surrounded by a pair of side plates and a bottom plate to form a housing space therein, and a cassette body facing the bottom plate. And a recording plate having a stimulable phosphor sheet adhered to a tray.The recording plate and the holder are detachably connected to each other. A holder disposed in the accommodation space in a radiation cassette for accommodating a recording plate in the accommodation space through the attachment / detachment hole and mounting the holder in the attachment / detachment hole to hermetically cover the accommodation space; A radiation cassette, wherein an elastic material is provided on an inner side surface of the recording medium so as to repel a base end of a recording plate in the housing space portion and abut a leading end of the recording plate with a bottom plate of the cassette body.