JPH06119989A - X-ray device - Google Patents

X-ray device

Info

Publication number
JPH06119989A
JPH06119989A JP4286799A JP28679992A JPH06119989A JP H06119989 A JPH06119989 A JP H06119989A JP 4286799 A JP4286799 A JP 4286799A JP 28679992 A JP28679992 A JP 28679992A JP H06119989 A JPH06119989 A JP H06119989A
Authority
JP
Japan
Prior art keywords
ray
thickness
tube voltage
filter
cone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP4286799A
Other languages
Japanese (ja)
Other versions
JP2674443B2 (en
Inventor
Masumi Kawai
益実 河合
Shuji Tanaka
修二 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shimadzu Corp
Original Assignee
Shimadzu Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Priority to JP4286799A priority Critical patent/JP2674443B2/en
Publication of JPH06119989A publication Critical patent/JPH06119989A/en
Application granted granted Critical
Publication of JP2674443B2 publication Critical patent/JP2674443B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • X-Ray Techniques (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

PURPOSE:To lessen the X-ray dosage to the skin of a human body to be irradiated by controlling the effective filter thickness according to the information about the tube voltage, by increasing the filter thickness when the tube voltage is low, and thereby reducing soft X-ray. CONSTITUTION:The scope of irradiation is restricted by furnishing a lead cone 2 at the X-ray irradiation aperture of an X-ray tube 1, and in the neighborhood of the cone 2, a collimator 3 for X-ray is installed which has a movable filter device 4 confronting the cone 2, and is operated in conformity to the tube voltage signal given by an X-ray control device, not illustrated, i.e., a kV signal. The device 4 is formed from two aluminum plates 41, 42, for example in the form of varying thickness in wedge shape, and these are moved in opposite directions simultaneously as indicated by arrows and intruded into and retreated from the scope of X-ray irradiation so that the effective thickness varies. Because the device 4 is only required to have a varying effective thickness for the X-ray penetrating the device, its may also be accepted that aluminum plate of a certain thickness is rotated round the axis to adjust the X-ray amount passing. In this manner, soft X-ray are lessened which do not contribute to photo-sensing of an image intensifier.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、医療の診断あるいは
非破壊材料検査などの分野においてX線を発生するのに
用いられるX線装置に関し、とくにX線イメージインテ
ンシファイア及びテレビジョン撮像管とを組み合わせた
X線テレビジョンシステムにおいて用いられるのに好適
なX線装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray apparatus used for generating X-rays in the fields of medical diagnosis or non-destructive material inspection, and more particularly to an X-ray image intensifier and a television image pickup tube. The present invention relates to an X-ray device suitable for use in an X-ray television system in which the above are combined.

【0002】[0002]

【従来の技術】従来の医療診断用X線テレビジョンシス
テムでは、被写体(人体)の皮膚線量を低減するため
に、X線管及びX線コリメータ内に一定の厚さのアルミ
ニウム板よりなるフィルタを挿入している。
2. Description of the Related Art In a conventional medical diagnostic X-ray television system, in order to reduce the skin dose to a subject (human body), an X-ray tube and an X-ray collimator are provided with a filter made of an aluminum plate having a certain thickness. Inserting.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、このよ
うなフィルタを用いる従来のX線装置では管電圧が低下
したときに被写体の皮膚線量が増加するという問題があ
る。
However, the conventional X-ray apparatus using such a filter has a problem that the skin dose to the subject increases when the tube voltage decreases.

【0004】すなわち、通常のX線テレビジョンシステ
ムでは、自動輝度調整回路により、表示画像の輝度が一
定になるようにX線強度を制御するのが一般的であり、
これによると、大視野のイメージインテンシファイアを
用いた場合や、体厚の小さい被写体に対しては安定した
管電圧が低下する。すると軟X線が増加することとなる
が、この軟X線はイメージインテンシファイアの発光効
率の線質依存性により、イメージインテンシファイアの
発光に寄与しないものである。そのため、低管電圧領域
ではイメージインテンシファイアの入射X線のうち発光
に寄与しない軟X線の割合が増えることにより、その全
体の入射X線量つまり被検者の皮膚線量が増加すること
になる。
That is, in a normal X-ray television system, the X-ray intensity is generally controlled by an automatic brightness adjusting circuit so that the brightness of the display image becomes constant.
According to this, when using an image intensifier with a large field of view, or for a subject with a small body thickness, the stable tube voltage drops. Then, the soft X-rays increase, but the soft X-rays do not contribute to the light emission of the image intensifier due to the quality dependence of the light emission efficiency of the image intensifier. Therefore, in the low tube voltage region, the proportion of soft X-rays that do not contribute to light emission in the incident X-rays of the image intensifier increases, so that the entire incident X-ray dose, that is, the skin dose of the subject increases. .

【0005】この発明は、上記に鑑み、低管電圧領域で
軟X線を除去することができるように改善した、X線装
置を提供することを目的とする。
In view of the above, an object of the present invention is to provide an X-ray apparatus improved so as to remove soft X-rays in a low tube voltage region.

【0006】[0006]

【課題を解決するための手段】上記の目的を達成するた
め、この発明によるX線装置では、X線管と、該X線管
のX線出射口付近に取り付けられ、管電圧に関する情報
に応じて実効フィルタ厚が制御される可動フィルタ装置
とを備えることが特徴となっている。
In order to achieve the above object, in an X-ray device according to the present invention, an X-ray tube and an X-ray emitting port of the X-ray tube are mounted in the vicinity of the X-ray tube, and the X-ray tube is provided with information on the tube voltage. And a movable filter device whose effective filter thickness is controlled.

【0007】[0007]

【作用】管電圧が低くなると、軟X線の割合が増大す
る。そのため、イメージインテンシファイアの発光に寄
与するX線の割合が少なくなることなどにより、低管電
圧領域ではイメージインテンシファイアなどに入射する
X線量が増大する。そこで、この管電圧に関する情報に
応じて実効フィルタ厚を制御することにより、低管電圧
時にフィルタ厚を増大して軟X線を低減すると、イメー
ジインテンシファイアなどの入射X線量つまり被写体
(人体)の皮膚線量を少なくすることができる。
When the tube voltage decreases, the proportion of soft X-rays increases. Therefore, the proportion of X-rays contributing to the light emission of the image intensifier decreases, and the X-ray dose incident on the image intensifier increases in the low tube voltage region. Therefore, if the effective filter thickness is controlled according to the information on the tube voltage to increase the filter thickness and reduce the soft X-rays at a low tube voltage, the incident X-ray dose of the image intensifier or the like, that is, the subject (human body) The skin dose can be reduced.

【0008】[0008]

【実施例】以下、この発明の好ましい一実施例について
図面を参照しながら詳細に説明する。図1に示すよう
に、X線管1のX線照射口には鉛コーン2が設けられて
いて照射野が制限されるようになっている。そして、こ
の鉛コーン2近傍にX線用のコリメータ3が取り付けら
れる。このコリメータ3には可動フィルタ装置4が設け
られ、図示しないX線制御装置からの管電圧信号(kV
信号)に応じて動作するようになっている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 1, a lead cone 2 is provided at the X-ray irradiation port of the X-ray tube 1 to limit the irradiation field. Then, a collimator 3 for X-rays is attached near the lead cone 2. The collimator 3 is provided with a movable filter device 4, and a tube voltage signal (kV) from an X-ray controller (not shown) is provided.
It operates according to the signal).

【0009】すなわち、可動フィルタ装置4は、たとえ
ば図2に示すように、くさび形に厚さが変化している2
つのアルミニウム板41、42を有する。これらを適当
な機構(図示しない)により矢印に示すように反対方向
に同時に動かすことにより、X線照射野に対して侵入・
後退させてその実効的な厚さを変化させる。駆動装置4
3はkV信号に応じてこのアルミニウム板41、42を
移動させる。
That is, the movable filter device 4 has a wedge-shaped thickness change 2 as shown in FIG. 2, for example.
It has two aluminum plates 41 and 42. By simultaneously moving these in the opposite directions as shown by the arrow by an appropriate mechanism (not shown), the entry into the X-ray irradiation field
It is retracted to change its effective thickness. Drive unit 4
3 moves the aluminum plates 41 and 42 according to the kV signal.

【0010】なお、この可動フィルタ装置4はそれを透
過するX線にとって実効的な厚さが変化すればよいの
で、他の構成も可能であり、たとえば図3に示すように
X線照射野に対して一定の厚さのアルミニウム板44を
回転させるようにしてもよい。
Since the movable filter device 4 only needs to have a change in the effective thickness for the X-rays that pass therethrough, other configurations are possible, for example, in the X-ray irradiation field as shown in FIG. Alternatively, the aluminum plate 44 having a constant thickness may be rotated.

【0011】そして、このように構成された可動フィル
タ装置4によって、管電圧が低くなったときに図4に示
すように実効的なフィルタ厚が大きくなるような制御が
行なわれる。管電圧が高くなったときはフィルタ厚が減
少するよう制御されるが、放射線防護に関するJIS規
格を下回らないようある一定値以下にはならないような
制御が行なわれる。
The movable filter device 4 thus constructed controls the effective filter thickness to increase as shown in FIG. 4 when the tube voltage decreases. When the tube voltage becomes high, the filter thickness is controlled so as to decrease, but the control is performed so that it does not fall below a certain value so as not to fall below the JIS standard for radiation protection.

【0012】これにより、低管電圧領域でフィルタ厚が
増加し、イメージインテンシファイアの発光に寄与しな
い軟X線を低減することができ、皮膚線量を低減させる
ことができる。
As a result, the filter thickness increases in the low tube voltage region, soft X-rays that do not contribute to the light emission of the image intensifier can be reduced, and the skin dose can be reduced.

【0013】すなわち、自動輝度調整回路を有するX線
テレビジョンシステムでは、イメージインテンシファイ
アとテレビジョンカメラとの組み合わせによって画像信
号を得て、これをテレビジョンモニター装置に送り、X
線画像を表示するとき、その表示画像の輝度が一定にな
るよう管電圧を変化させてX線強度を制御する。そのた
め、このような自動輝度調整回路を有するX線テレビジ
ョンシステムで、被写体厚が変化するとイメージインテ
ンシファイア入射線量がどのように変化するかを実験し
てみると、図5に示すような実験データが得られる。こ
れに示すように、被写体として用いられたアクリル板の
厚さに応じて管電圧が下がり、それに応じて入射X線量
が増大していることが分かる。これはイメージインテン
シファイアの発光に寄与しない軟X線の割合が、低管電
圧領域で増すからである。
That is, in an X-ray television system having an automatic brightness adjusting circuit, an image signal is obtained by a combination of an image intensifier and a television camera, and this image signal is sent to a television monitor device for X-ray
When a line image is displayed, the X-ray intensity is controlled by changing the tube voltage so that the brightness of the displayed image is constant. Therefore, in an X-ray television system having such an automatic brightness adjustment circuit, an experiment as to how the image intensifier incident dose changes when the subject thickness changes is as shown in FIG. Data is obtained. As shown in this figure, it can be seen that the tube voltage decreases according to the thickness of the acrylic plate used as the subject, and the incident X-ray dose increases accordingly. This is because the proportion of soft X-rays that do not contribute to the light emission of the image intensifier increases in the low tube voltage region.

【0014】また、この図5は、フィルタとして用いる
アルミニウム板の厚さを変え、あるいは材質も変えたと
きのデータも示している。すなわち、曲線51はアルミ
ニウム板の厚さを2.5mmとしたとき、曲線52はア
ルミニウム板の厚さを4.0mmとしたときをそれぞれ
示し、曲線53は2.5mmのアルミニウム板に金を厚
さ20μmに付着したものを用いたときを示している。
これによると、フィルタ厚を増加することによりイメー
ジインテンシファイアの入射X線量を減少させることが
分かる。これはフィルタ厚を増加することによって軟X
線を減少させたためである。
Further, FIG. 5 also shows data when the thickness of the aluminum plate used as the filter is changed or the material is changed. That is, the curve 51 shows the case where the thickness of the aluminum plate is 2.5 mm, the curve 52 shows the case where the thickness of the aluminum plate is 4.0 mm, and the curve 53 shows the case where the thickness of the aluminum plate is 2.5 mm. It shows the case where the one having a thickness of 20 μm is used.
It can be seen that the incident X-ray dose of the image intensifier is reduced by increasing the filter thickness. This is a soft X due to increasing the filter thickness.
This is because the line has been reduced.

【0015】そこで、これらより、低管電圧領域でフィ
ルタ厚を増加させるよう制御することによって、イメー
ジインテンシファイアの発光に寄与しない軟X線を低減
させ、皮膚線量を低減させることができるのである。
Therefore, by controlling the filter thickness so as to increase in the low tube voltage region, the soft X-rays that do not contribute to the light emission of the image intensifier can be reduced and the skin dose can be reduced. .

【0016】なお、ここでは自動輝度調整回路を有する
X線テレビジョンシステムでの使用を前提として説明し
たが、このような自動輝度調整回路を持たず手動で管電
圧を調整する場合であっても、X線制御装置から管電圧
に関する何らかの情報を入力し、それに応じて実効的に
フィルタ厚を制御する構成であってもよい。
Although the description has been given here on the premise of use in an X-ray television system having an automatic brightness adjusting circuit, even when the tube voltage is manually adjusted without such an automatic brightness adjusting circuit. Alternatively, the X-ray controller may input some information about the tube voltage, and the filter thickness may be effectively controlled according to the information.

【0017】また、上記では可動フィルタ装置4はコリ
メータ3内に組み込まれているが、可動フィルタ装置4
をコリメータ3から切り離し、単体として鉛コーン2上
に設置することも考えられる。
Further, although the movable filter device 4 is incorporated in the collimator 3 in the above, the movable filter device 4 is used.
It is also conceivable to separate from the collimator 3 and install it on the lead cone 2 as a single body.

【0018】[0018]

【発明の効果】以上説明したように、この発明のX線装
置によれば、管電圧が低くなったときに実効フィルタ厚
を増大して軟X線を低減することにより、被写体(人
体)の皮膚線量を少なくすることができる。
As described above, according to the X-ray apparatus of the present invention, when the tube voltage becomes low, the effective filter thickness is increased to reduce the soft X-rays, so that the subject (human body) Skin dose can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の一実施例のブロック図。FIG. 1 is a block diagram of an embodiment of the present invention.

【図2】同実施例の可動フィルタ装置部分を示す模式
図。
FIG. 2 is a schematic view showing a movable filter device portion of the same embodiment.

【図3】可動フィルタ装置の他の例を示す模式図。FIG. 3 is a schematic view showing another example of the movable filter device.

【図4】管電圧に対する実効フィルタ厚を示すグラフ。FIG. 4 is a graph showing the effective filter thickness with respect to the tube voltage.

【図5】被写体厚に対するイメージインテンシファイア
入射線量についての実験データを示すグラフ。
FIG. 5 is a graph showing experimental data on image intensifier incident dose with respect to subject thickness.

【符号の説明】[Explanation of symbols]

1 X線管 2 鉛コーン 3 コリメータ 4 可動フィルタ装置 41、42、44 アルミニウム板 43 駆動装置 1 X-ray tube 2 Lead cone 3 Collimator 4 Movable filter device 41, 42, 44 Aluminum plate 43 Drive device

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 X線管と、該X線管のX線出射口付近に
取り付けられ、管電圧に関する情報に応じて実効フィル
タ厚が制御される可動フィルタ装置とを備えることを特
徴とするX線装置。
1. An X-ray tube, comprising: an X-ray tube; and a movable filter device which is mounted near the X-ray emission port of the X-ray tube and whose effective filter thickness is controlled according to information about the tube voltage. Line device.
JP4286799A 1992-09-30 1992-09-30 X-ray equipment Expired - Fee Related JP2674443B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4286799A JP2674443B2 (en) 1992-09-30 1992-09-30 X-ray equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4286799A JP2674443B2 (en) 1992-09-30 1992-09-30 X-ray equipment

Publications (2)

Publication Number Publication Date
JPH06119989A true JPH06119989A (en) 1994-04-28
JP2674443B2 JP2674443B2 (en) 1997-11-12

Family

ID=17709199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4286799A Expired - Fee Related JP2674443B2 (en) 1992-09-30 1992-09-30 X-ray equipment

Country Status (1)

Country Link
JP (1) JP2674443B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020025744A (en) * 2000-09-28 2002-04-04 추후제출 X-ray ct system, gantry apparatus, console terminal, method of controlling them, and storage medium
WO2003012414A1 (en) * 2001-07-30 2003-02-13 American Science And Engineering, Inc. X-ray inspection using spatially and spectrally tailored beams
JP2010240028A (en) * 2009-04-01 2010-10-28 Shimadzu Corp X-ray imaging apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110786A (en) * 1974-07-16 1976-01-28 Kaoru Ninomya Shinsatsuyoetsukususentoshisochiniokeru hibakusenryokeigenho
JPH04141156A (en) * 1990-09-30 1992-05-14 Shimadzu Corp Computerized tomograph

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5110786A (en) * 1974-07-16 1976-01-28 Kaoru Ninomya Shinsatsuyoetsukususentoshisochiniokeru hibakusenryokeigenho
JPH04141156A (en) * 1990-09-30 1992-05-14 Shimadzu Corp Computerized tomograph

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020025744A (en) * 2000-09-28 2002-04-04 추후제출 X-ray ct system, gantry apparatus, console terminal, method of controlling them, and storage medium
WO2003012414A1 (en) * 2001-07-30 2003-02-13 American Science And Engineering, Inc. X-ray inspection using spatially and spectrally tailored beams
JP2010240028A (en) * 2009-04-01 2010-10-28 Shimadzu Corp X-ray imaging apparatus

Also Published As

Publication number Publication date
JP2674443B2 (en) 1997-11-12

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