JPH02100042A - X-ray tomographing device - Google Patents

Abstract

PURPOSE:To obtain an X-ray film image of excellent picture quality by arranging a sheet type X-ray absorbing member between a rear intensifying screen and a rear pressure plate so that the member is freely inserted and extracted. CONSTITUTION:When a photograph is taken, an unexposed film F is set between a front intensifying screen 3 and a rear intensifying screen 4 by a supply roll 12 from a supply magazine 13 while the front intensifying screen 3, the rear intensifying screen 4, and a thin lead plate 5 are on an optical axis. Then the rear pressure plate 6 moves toward a front pressure plate 2 to bring the film F between the intensifying screens 3 and 4 in contact, and X rays from an X-ray tube 1 are projected to photograph a transmission image of a subject P on the film F. The X-ray exposure in the photography is performed in a short time, but the dosage is large, so some of the X rays are absorbed by the rear thin lead plate 5, but the remaining transmitted X rays are scattered by the rear pressure plate 6. The scattered light which returns to the film F is absorbed by the thin lead plate 5. Consequently, the X-ray image of good picture quality is obtained.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、Ｘ線フィルム撮影部とＸ線蛍光増倍管が一体
化され、撮影部とＸ線蛍光増倍管の位置関係を変えずに
、Ｘ線フィルム撮影とＸ線透視とを行えるようにしたＸ
線撮影透視装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is characterized in that an X-ray film imaging section and an X-ray fluorescence intensifier are integrated, and the positional relationship between the imaging section and the X-ray fluorescence intensifier remains unchanged. In addition, an X-ray machine capable of performing X-ray film photography and X-ray fluoroscopy
The present invention relates to radiographic fluoroscopic equipment.

［従来の技術］ ２枚の増感紙に挟まれたフィルムに被写体を透過したＸ
線を照射して撮影するＸ線直接撮影装置と、被写体を透
過したＸ線をＸ線蛍光増倍管の入力面に照射し、可視化
された出力像を観察するＸ線透視装置とを、被写体、撮
影装置、透視装置の順に一体的に配置したＸ線撮影透視
装置が最近提案されている。[Conventional technology] X that passes through a subject through a film sandwiched between two intensifying screens
A direct X-ray imaging device that irradiates and takes pictures with X-rays, and an X-ray fluoroscopy device that irradiates the input surface of an X-ray fluorescence intensifier tube with the X-rays that have passed through the subject and observes the visualized output image. Recently, an X-ray imaging and fluoroscopic apparatus has been proposed in which a radiographing apparatus, an imaging apparatus, and a fluoroscopy apparatus are integrally arranged in this order.

このような一体止を行うことにより、Ｘ線撮影装置とＸ
線透視装置を別々に移動し切り換えて使用することによ
る時間の損失や、再装置の重量が大きいために生ずる切
換機構の大型化や、また装置全体のバランスが不安定に
なる等の問題を解消することができる。By performing such integral fixing, the X-ray imaging device and
Eliminates problems such as the loss of time caused by moving and switching the fluoroscopy equipment separately, the increase in the size of the switching mechanism caused by the heavy weight of the equipment, and the instability of the overall balance of the equipment. can do.

また、Ｘ線撮影時に被写体を透過したＸ線は、２枚の増
感紙とこれらの増感紙を前後から挟み込んでいる２枚の
圧板を透過し、後方のＸ線蛍光増倍管に入射する。この
出力像はテレビモニタ上に表示されるので、検者は撮影
部位を確認することができるという利点がある。In addition, the X-rays that pass through the subject during X-ray photography pass through two intensifying screens and two pressure plates that sandwich these intensifying screens from the front and back, and enter the X-ray fluorescence intensifier tube at the rear. do. Since this output image is displayed on a television monitor, there is an advantage that the examiner can confirm the imaged region.

しかしながら、Ｘ線フィルム撮影がＸ線の短時間照射で
あるのに比較して、Ｘ線透視は弱いＸ線を１１！統して
照射する検査法である。従って、透視時においては理想
的には被写体とＸ線蛍光増倍管との間には、Ｘ線を吸収
する物体が存在し無いことが望ましい、そこで、透視時
にはＸ線吸収の多い増感紙をＸ線の光軸上から抜き取る
透視装置が、例えば米国特許公報第４７１２２２７号に
記載されている。However, compared to X-ray film photography, which irradiates X-rays for a short time, X-ray fluoroscopy emits weak X-rays for 11 times! This is an inspection method that uses irradiation in a unified manner. Therefore, during fluoroscopy, it is ideal that there be no object that absorbs X-rays between the subject and the X-ray fluorescence intensifier tube. A fluoroscopic device that extracts X-rays from the optical axis is described in, for example, US Pat. No. 4,712,227.

［発明が解決しようとする問題点］ また、従来装置における他の問題点は、Ｘ線フィルム撮
影時の後方圧板における散乱Ｘ線の処理である。特に、
Ｘ線の管電圧が１２０ｋＶ以上の高圧撮影時に、後方圧
板からの散乱Ｘ線の影響が多く、フィルム上にフレア等
を発させることがある。[Problems to be Solved by the Invention] Another problem with the conventional apparatus is the processing of scattered X-rays at the rear pressure plate during X-ray film photography. especially,
During high-voltage imaging where the X-ray tube voltage is 120 kV or more, there is a large influence of scattered X-rays from the rear pressure plate, which may cause flare or the like on the film.

圧板は増感紙とフィルムを平担に保持し、全面的に密着
させる必要があるために剛性が必要であり、更に透視観
察時には圧板はＸ線を最大限透過させる必要がある。そ
のため、後方圧板の中心部と周辺部で部材を変えて中心
部にＸ線の透過の良好な材料を用いたり、剛性を保つた
めに後方圧板にリブ等を入れたりしており、後方からの
散乱光の生じ方にもむらがあり、フィルムにもむらが生
ずることになる。The pressure plate must be rigid because it must hold the intensifying screen and film flat and in close contact with each other over the entire surface, and furthermore, during fluoroscopic observation, the pressure plate must allow maximum X-rays to pass through. For this reason, we change the materials at the center and periphery of the rear pressure plate, using a material with good X-ray transmission in the center, and insert ribs, etc. into the rear pressure plate to maintain rigidity. There is also unevenness in the way the scattered light is generated, resulting in unevenness in the film.

［発明の目的］ 本発明の目的は、撮影時にはＸ線吸収部材を挿入して後
方圧板からの散乱Ｘ線の影響を少なくし、良好な画質の
Ｘ線フィルム像を得ることができ、透視観察時には後方
圧板前のＸ線吸収部材を抜いて、十分な線量のＸ線をＸ
線蛍光増倍管に入射させることを可能にしたＸ線撮影透
視装置を提供することにある。[Objective of the Invention] The object of the present invention is to insert an X-ray absorbing member during imaging to reduce the influence of scattered X-rays from the rear pressure plate, to obtain an X-ray film image of good image quality, and to facilitate fluoroscopic observation. Sometimes, the X-ray absorbing member in front of the rear pressure plate is removed and a sufficient amount of X-rays are delivered.
An object of the present invention is to provide an X-ray imaging fluoroscopy device that allows radiation to enter a fluorescent intensifier tube.

［発明の概要］ 上述の目的を達成するための本発明の要旨は、前方正板
と後方圧板の間に前方増感紙、後方増感紙を挟んで成る
撮影部の後方にＸ線蛍光増倍管を配置したＸ線撮影透視
装置において、前記後方増感紙と後方圧板の間にシート
状のＸ線吸収部材を抜き挿し自在に配置したことを特徴
とするＸ線撮影透視装置である。[Summary of the Invention] The gist of the present invention to achieve the above-mentioned object is to provide an X-ray fluorescence intensifier at the rear of the imaging section, which is formed by sandwiching a front intensifying screen and a rear intensifying screen between the front front plate and the rear pressure plate. The X-ray fluoroscopy apparatus is characterized in that a sheet-shaped X-ray absorbing member is freely inserted and removed between the rear intensifying screen and the rear pressure plate in the X-ray fluoroscopy apparatus in which a tube is arranged.

［発明の実施例］ 本発明を図示の実施例に基づいて詳細に説明する。[Embodiments of the invention] The present invention will be explained in detail based on illustrated embodiments.

第１図はＸ線撮影透視装置の構成図であり、Ｘ線管法ｌ
のＸ線照射方向に前方圧板２、前方増感紙３、後方増感
紙４、薄鉛板５、後方圧板６、Ｘ線蛍光増倍管７が順次
に配置されている。ここで、薄鉛板５は柔軟性を有する
板厚０．２ｍｍ程度の鉛板であり、後方増感紙４の裏面
に貼り付けられている。また、前方増感紙３及び後方増
感紙４はそれぞれ搬送シート８，９に貼り付けられ、こ
れらの搬送シート８，９は巻取ローラ１０．１１の回転
により前方増感紙３、後方増感紙４をそれぞれＸ線の光
軸上に抜き挿し自在に設置されおり、後方増感紙４の移
動に伴って薄鉛板５も移動する。なお、後方圧板６は図
示しない圧着機構により前後に移動可能に設置され前方
圧板２と密着するようになっている。増感紙３．４の一
側方には未撮影のフィルムＦの供給ローラ１２及び供給
マガジン１３が設けられており、反対側には撮影済のフ
ィルムＦを導くガイド板１４、排出ローラ１５及びフィ
ルムＦの収納マガジン１６が設置されている。また、Ｘ
線蛍光増倍管７の後方の出力面側には、結像レンズ１７
．テレビカメラ１８が設置され、テレビカメラ１８の出
力端子はテレビモニタ１９の入力端子に接続されている
。Figure 1 is a block diagram of the X-ray imaging fluoroscopy system.
A front pressure plate 2, a front intensifying screen 3, a rear intensifying screen 4, a thin lead plate 5, a rear pressure plate 6, and an X-ray fluorescence intensifier tube 7 are sequentially arranged in the X-ray irradiation direction. Here, the thin lead plate 5 is a flexible lead plate having a thickness of about 0.2 mm, and is attached to the back surface of the rear intensifying screen 4. Further, the front intensifying screen 3 and the rear intensifying screen 4 are attached to conveying sheets 8 and 9, respectively, and these conveying sheets 8 and 9 are attached to the front intensifying screen 3 and the rear intensifying screen 4 by rotation of the winding rollers 10 and 11. The photosensitive screens 4 are installed on the X-ray optical axis so that they can be inserted and removed freely, and as the rear intensifying screen 4 moves, the thin lead plate 5 also moves. Note that the rear pressure plate 6 is installed so as to be movable back and forth by a pressure bonding mechanism (not shown), and is brought into close contact with the front pressure plate 2. On one side of the intensifying screen 3.4, there are provided a supply roller 12 and a supply magazine 13 for the unexposed film F, and on the opposite side there are provided a guide plate 14 for guiding the exposed film F, a discharge roller 15, and A storage magazine 16 for film F is installed. Also, X
An imaging lens 17 is disposed on the rear output surface side of the linear fluorescence multiplier tube 7.
．． A television camera 18 is installed, and an output terminal of the television camera 18 is connected to an input terminal of a television monitor 19.

このような構成において、撮影時には先ず前方増感紙３
と後方増感紙４及び薄鉛板５が光軸上に存在する状態で
、未撮影のフィルムＦが供給マガジン１３から供給ロー
ラ１２により増感紙３．４の間にセットされる。そして
、後方圧板６が前方圧板２側に移動し、増感紙３．４間
にフィルムＦを密着させる。この状態で、Ｘ線管球１か
らＸ線が曝射され、被写体Ｐの透過像がフィルムＦに撮
影される。撮影の際のＸ線曝射は短時間であるが、線量
が多いために後方の薄鉛板５で一部が吸収されるものの
、残りの透過したＸ線が後方正板６で散乱を生ずる。し
かし、この散乱光のフィルムＦ側に戻る分は撮影時には
Ｘ線吸収部材を挿入して後方圧板６からの散乱Ｘ線は薄
鉛板５により吸収され、フィルムＦにフレア等の影響を
与えることは殆どない。In such a configuration, when photographing, the front intensifying screen 3 is first
With the rear intensifying screen 4 and thin lead plate 5 located on the optical axis, an unphotographed film F is set between the intensifying screens 3 and 4 from the supply magazine 13 by the supply roller 12. Then, the rear pressure plate 6 moves toward the front pressure plate 2, and the film F is brought into close contact between the intensifying screens 3 and 4. In this state, X-rays are emitted from the X-ray tube 1, and a transmitted image of the subject P is photographed on the film F. Although the X-ray exposure during imaging is short-term, the amount of radiation is large, and although some of it is absorbed by the rear thin lead plate 5, the remaining transmitted X-rays are scattered by the rear front plate 6. . However, an X-ray absorbing member is inserted during imaging to absorb the scattered light that returns to the film F side, and the scattered X-rays from the rear pressure plate 6 are absorbed by the thin lead plate 5, causing effects such as flare on the film F. There are almost no

更に、このＸ線撮影時には後方圧板６を透過したｘ１！
像は、Ｘ線蛍光増倍管７に入射し可視光として増倍され
、出力像はテレビカメラ１８を介してテレビモニタ１９
に写し出され、撮影部位等を確認することができる。撮
影が終了すると、フィルムＦは排出ローラ１５により収
納イガジン１６内に収納される。Furthermore, x1 transmitted through the rear pressure plate 6 during this X-ray photography!
The image enters an X-ray fluorescence intensifier tube 7 and is multiplied as visible light, and the output image is sent to a television monitor 19 via a television camera 18.
The image will be displayed on the screen, allowing you to confirm the area being photographed. When the photographing is completed, the film F is stored in the storage magazine 16 by the ejection roller 15.

透視観察時には、前後の増感紙３．４がそれぞれ搬送シ
ート８．９と共に巻取ローラ１０．１１に巻き取られ、
Ｘ線の光軸上から引き出される。During transparent observation, the front and rear intensifying screens 3.4 are respectively wound up by the winding roller 10.11 together with the conveying sheet 8.9,
Extracted from the optical axis of the X-ray.

このとき、薄鉛板５も後方増感紙４と共に巻き取られ光
軸から外れるために、被写体ＰとＸ線蛍光増倍管７の間
には、前後の圧板２．６だけしか残らず、この状態でＸ
線管球１から撮影に比べて弱いＸ線が連続して照射され
、被写体Ｐの透過像がＸ線蛍光増倍管７、テレビカメラ
１８を介してテレビモニタ１９に写し出されることにな
る。At this time, since the thin lead plate 5 is also wound up together with the rear intensifying screen 4 and removed from the optical axis, only the front and rear pressure plates 2.6 remain between the subject P and the X-ray fluorescence intensifier tube 7. In this state
X-rays that are weaker than those used in imaging are continuously irradiated from the ray tube 1, and a transmitted image of the subject P is displayed on the television monitor 19 via the X-ray fluorescence intensifier 7 and the television camera 18.

第２図は第２の実施例の構成図であり、Ｘ線吸収部材で
ある薄鉛板５を後方増感紙４に貼り付けずに、別個に搬
送シート２０を介して第３の巻取ローラ２１に巻き取る
ことにより光軸上に出し入れする。これにより、増感紙
３．４とは別のタイミングで薄鉛板５を抜き挿ししたり
、第２図において紙面と垂直方向に薄鉛板５を出し入れ
することも可能である。FIG. 2 is a configuration diagram of a second embodiment, in which the thin lead plate 5, which is an By winding it up on the roller 21, it is moved in and out onto the optical axis. This makes it possible to insert and remove the thin lead plate 5 at a timing different from that of the intensifying screen 3.4, or to insert and remove the thin lead plate 5 in a direction perpendicular to the plane of the paper in FIG.

［発明の効果］ 以上説明したように本発明に係るＸ線撮影透視？ｔＥｋ
は、Ｘ線フィルム撮影時にＸ線吸収部材を挿入し、観察
時には光軸上から外すようにしたため、撮影時には後方
圧板の散乱による画質の劣化を防止し、透視観察時にお
けるｘ！！の曝射量を少量化することが可能になる。[Effects of the Invention] As explained above, the X-ray imaging fluoroscopy according to the present invention? tEk
By inserting an X-ray absorbing member during X-ray film imaging and removing it from the optical axis during observation, it is possible to prevent deterioration of image quality due to scattering from the rear pressure plate during imaging, and x! during fluoroscopic observation. ! It becomes possible to reduce the amount of radiation.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明に係るＸ線撮影透視装置の実施例を示し、
第１図は第１の実施例の構成図、第２図は第２の実施例
の構成図である。 符号１はＸ線管球、２は前方圧板、３は前方増感紙、４
は後方増感紙、５は薄鉛板、６は後方圧板、７はＸ線蛍
光増倍管、８．９．２０は搬送シート、１０．１１．２
１は巻取ローラ、１８はテレビカメラ、 １９はテレビモニタ、Ｆはフィル ムである。The drawings show an embodiment of the X-ray imaging fluoroscopy device according to the present invention,
FIG. 1 is a block diagram of the first embodiment, and FIG. 2 is a block diagram of the second embodiment. 1 is an X-ray tube, 2 is a front pressure plate, 3 is a front intensifying screen, 4
is a rear intensifying screen, 5 is a thin lead plate, 6 is a rear pressure plate, 7 is an X-ray fluorescence intensifier tube, 8.9.20 is a conveyance sheet, 10.11.2
1 is a take-up roller, 18 is a television camera, 19 is a television monitor, and F is a film.

Claims (1)

【特許請求の範囲】[Claims] １、前方圧板と後方圧板の間に前方増感紙、後方増感紙
を挟んで成る撮影部の後方にＸ線蛍光増倍管を配置した
Ｘ線撮影透視装置において、前記後方増感紙と後方圧板
の間にシート状のＸ線吸収部材を抜き挿し自在に配置し
たことを特徴とするＸ線撮影透視装置。1. In an X-ray imaging fluoroscopic device in which an X-ray fluorescence intensifier tube is arranged at the rear of an imaging section consisting of a front intensifying screen and a rear intensifying screen sandwiched between a front pressure plate and a rear pressure plate, the rear intensifying screen and the rear An X-ray imaging fluoroscopy device characterized in that a sheet-like X-ray absorbing member is freely inserted and removed between pressure plates.