JPH07204196A - X-ray ct system - Google Patents
X-ray ct systemInfo
- Publication number
- JPH07204196A JPH07204196A JP6021867A JP2186794A JPH07204196A JP H07204196 A JPH07204196 A JP H07204196A JP 6021867 A JP6021867 A JP 6021867A JP 2186794 A JP2186794 A JP 2186794A JP H07204196 A JPH07204196 A JP H07204196A
- Authority
- JP
- Japan
- Prior art keywords
- ray
- irradiation
- dose
- value
- radiation
- 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
Links
- 230000010354 integration Effects 0.000 claims description 6
- 230000005855 radiation Effects 0.000 abstract description 8
- 238000005259 measurement Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002591 computed tomography Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、被検体に対する過剰な
X線照射を防止可能としたX線CT装置に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT apparatus capable of preventing excessive X-ray irradiation of a subject.
【0002】[0002]
【従来の技術】X線CT装置は、一般に、X線管とX線
検出器とが対向配置されてなるガントリと、前記X線管
とX線検出器との間に被検体を移動させる被検体テーブ
ルと、前記ガントリ及び被検体テーブルの動作を制御す
るスキャナ制御装置と、X線の発生を制御するX線制御
装置と、前記X線検出器より得られたデータを処理し画
像を再構成する演算装置と、演算された画像を表示する
表示装置と、前記X線検出器より得られたデータや演算
された画像を記憶しておく記憶装置と、装置各部を統括
して制御する計測制御装置と、各種撮影条件を入力する
入力装置とを備えてなる。2. Description of the Related Art Generally, an X-ray CT apparatus generally includes a gantry in which an X-ray tube and an X-ray detector are arranged to face each other, and an object for moving an object between the X-ray tube and the X-ray detector. A sample table, a scanner controller for controlling the operations of the gantry and the subject table, an X-ray controller for controlling the generation of X-rays, and data reconstructed by processing the data obtained from the X-ray detector. And a display device for displaying the calculated image, a storage device for storing the data obtained by the X-ray detector and the calculated image, and measurement control for integrally controlling each part of the device. It is provided with a device and an input device for inputting various photographing conditions.
【0003】ところで従来のX線CT装置は、被検体の
各照射部位に対してどの位の量のX線が照射されたか、
そして、これから行おうとする計測において更にどの位
X線照射されるかにつき、操作者が一々メモを取って計
算しながらでなければ正確には分からなかった。しか
も、忙しい病院などでのルーチン検査においてそのよう
なメモを取って計算する時間は実際上、取れなかった。By the way, in the conventional X-ray CT apparatus, how much X-ray is irradiated to each irradiation site of the subject,
Then, it was impossible to know exactly how much more X-rays would be irradiated in the measurement to be performed, until the operator made a note and calculated one by one. Moreover, in the routine examinations at busy hospitals, it was practically impossible to take time to take such notes and calculate them.
【0004】[0004]
【発明が解決しようとする課題】このため従来装置で
は、同一部位に対して過剰にX線が照射されることがあ
った。また、操作者の不注意で被検体の寝載されている
寝台のスキャン毎の送り量を0に設定してしまい、同一
部位を何度もスキャンして、被検者に無用な照射を与え
てしまうという問題点があった。For this reason, in the conventional apparatus, the X-ray may be excessively irradiated to the same site. In addition, the operator carelessly sets the feeding amount for each scan of the bed on which the subject is lying down to 0, scans the same site many times, and gives unnecessary radiation to the subject. There was a problem that it would end up.
【0005】本発明の目的は、操作者の無配慮や不注意
による過剰なX線照射を防止することのできるX線CT
装置を提供することにある。An object of the present invention is to provide an X-ray CT capable of preventing excessive X-ray irradiation due to carelessness or carelessness of an operator.
To provide a device.
【0006】[0006]
【課題を解決するための手段】上記目的は、照射された
X線量を各々の照射部位において積算して記憶すると共
に、これから行われようとするX線照射において各々の
照射部位における照射線量予想値を計算してそれまでの
積算値に加算し、その加算値を表示する照射状況表示手
段と、各々の照射部位における前記加算値が予め決めら
れた最大照射限度量を超えた場合にその旨を報知する報
知手段を設けることにより達成される。The above-mentioned object is to integrate and store the irradiated X-ray dose at each irradiation site, and to predict the irradiation dose at each irradiation site in the X-ray irradiation to be performed from now on. Is calculated and added to the integrated value up to that time, and irradiation status display means for displaying the added value, and when the added value at each irradiation site exceeds a predetermined maximum irradiation limit, that effect is indicated. This is achieved by providing an informing means for informing.
【0007】[0007]
【作用】照射状況表示手段は、照射されたX線量を各々
の照射部位において積算して記憶すると共に、これから
行われようとするX線照射において各々の照射部位にお
ける照射線量予想値を計算してそれまでの積算値に加算
し、その加算値を表示する。これによれば、それまでの
被検体の照射状況を把握でき、また引き続きスキャンを
行う場合、これから行おうとする計測において、どの位
照射されるかを今までの積算値に加えて把握される。ま
た報知手段は、各々の照射部位における加算値が予め決
められた最大照射限度量を超えた場合にその旨を報知す
る。これによれば、以後計測(X線照射スタート)を続
け得るかを明確に把握できる。以上によれば、操作者の
無配慮や不注意による過剰なX線照射が防止されること
になる。The irradiation status display means accumulates and stores the irradiated X-ray dose at each irradiation site, and calculates the expected irradiation dose value at each irradiation site in the X-ray irradiation to be performed from now on. It is added to the accumulated value up to that point and the added value is displayed. According to this, the irradiation state of the subject up to that point can be grasped, and in the case of subsequent scanning, how much irradiation is to be conducted is grasped in addition to the accumulated value so far in the measurement to be performed. Further, the notification means notifies that when the added value at each irradiation site exceeds a predetermined maximum irradiation limit amount. According to this, it is possible to clearly understand whether or not measurement (X-ray irradiation start) can be continued thereafter. According to the above, excessive X-ray irradiation due to carelessness or carelessness of the operator can be prevented.
【0008】[0008]
【実施例】以下、図面を参照して本発明の実施例を説明
する。図1は、本発明によるX線CT装置の一実施例の
要部を示すブロック図である。ここでは、X線管とし
て、現在のX線CT装置において大半が使用している扇
状X線2を発生するX線管1を例に採って述べる。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a main part of an embodiment of an X-ray CT apparatus according to the present invention. Here, as the X-ray tube, the X-ray tube 1 that generates the fan-shaped X-rays 2 that is mostly used in the current X-ray CT apparatus will be described as an example.
【0009】図1において、CTスキャンを行う場合、
その計測部位により、また計測目的により、扇状X線2
の厚さが異なる。また、被検体を寝載した寝台3は、診
断に必要な範囲を計測するため、被検体を寝載したまま
移動する。In FIG. 1, when performing a CT scan,
Depending on the measurement site and the measurement purpose, the fan-shaped X-ray 2
Of different thickness. In addition, the bed 3 on which the subject lies down moves in the lying state of the subject in order to measure the range necessary for diagnosis.
【0010】この2つの要素がX線照射の位置,範囲的
な要件となる。次に、X線2の強度も、部位,目的によ
り異なる。X線の強度は、主にX線管電流、管電圧、照
射時間により決まり、これらの計測条件は、操作者によ
って入力装置(計測条件入力装置)8を用いて設定され
る。These two factors are the requirements for the position and range of X-ray irradiation. Next, the intensity of the X-ray 2 also differs depending on the site and the purpose. The intensity of X-rays is mainly determined by the X-ray tube current, tube voltage, and irradiation time, and these measurement conditions are set by the operator using the input device (measurement condition input device) 8.
【0011】これらの入力設定された計測条件により計
測が行われる。計測されたときのこれらの設定条件は、
X線照射量積算装置4へ送られる。X線照射量積算装置
4では、寝台3の位置毎に照射されたX線強度を積算し
ていく。Measurement is performed under these input and set measurement conditions. These setting conditions when measured are
It is sent to the X-ray dose integration device 4. The X-ray dose integration device 4 integrates the X-ray intensities emitted for each position of the bed 3.
【0012】積算方法の例を、図2を併用して説明す
る。図2において、寝台3の位置nでX線幅wのX線2
が管電流cミリアンペア、照射時間t秒で照射されたと
する。図2(a)のグラフ21に、この1回のスキャン
分の照射状態を示す。An example of the integrating method will be described with reference to FIG. In FIG. 2, the X-ray 2 having the X-ray width w at the position n of the bed 3
Is irradiated with a tube current of c milliamps and an irradiation time of t seconds. A graph 21 in FIG. 2A shows the irradiation state for one scan.
【0013】X線照射量積算装置4は、図2(b)に示
すような、寝台3の位置に対応したアドレス(例えば寝
台3の1mmピッチにつき1アドレス)を持つメモリ2
2を持ち、X線2が照射された位置に対応するアドレス
に照射されたX線強度(ここではc×t)を加算してい
く(初期値は0)。1検査内での他のスキャンについて
も同様のことが行われ、X線照射量(照射線量)を積算
していく。The X-ray dose integrating device 4 has a memory 2 having an address (for example, one address per 1 mm pitch of the bed 3) corresponding to the position of the bed 3 as shown in FIG. 2B.
2 is added and the X-ray intensity (here, c × t) applied to the address corresponding to the position where the X-ray 2 is applied is added (the initial value is 0). The same is done for other scans within one examination, and the X-ray irradiation dose (irradiation dose) is integrated.
【0014】積算結果は、記憶装置5に送られて記憶さ
れ、同時に表示装置6に送られ、例えば図3に示すよう
なグラフ表示31で操作者に示される。この時、グラフ
表示31を被検体のスキャノグラム像と重ね合わせて表
示すると、実際に被検体のどの部位にどれだけ照射され
たか(照射状況)がより明確に捕らえることができる。
また、X線照射量積算装置4に、ある位置においてそこ
での照射線量がある限度量を超えた場合に警告音が鳴る
警告音発生装置(図示せず)等を付加して、過剰照射を
抑止できるようにすることもできる。The integrated result is sent to and stored in the storage device 5, simultaneously sent to the display device 6, and shown to the operator in a graph display 31 as shown in FIG. 3, for example. At this time, when the graph display 31 is displayed so as to be superimposed on the scanogram image of the subject, it is possible to more clearly grasp which part of the subject is actually irradiated and how much is irradiated (irradiation status).
Further, to the X-ray irradiation dose integration device 4, a warning sound generation device (not shown) that sounds a warning sound when the irradiation dose at a certain position exceeds a certain limit amount is added to suppress excessive irradiation. You can also allow it.
【0015】次に、これから行うスキャンに関して、照
射線量を予想する動作について述べる。先に述べたよう
に、計測条件は操作者が入力装置8から入力するが、こ
のとき入力設定された条件(主にX線管電流、管電圧、
照射時間)を照射線量の予想・警告装置7に送る。Next, the operation of predicting the irradiation dose will be described with respect to the scan to be performed. As described above, the operator inputs the measurement conditions from the input device 8. At this time, the conditions (mainly X-ray tube current, tube voltage,
(Irradiation time) is sent to the irradiation dose prediction / warning device 7.
【0016】予想・警告装置7では、以前の計測によっ
て照射されたX線の線量を記憶装置5から読み出し、そ
のデータと入力装置8から入力された、これから行われ
る計測でのX線照射データ(各照射部位毎の予想照射線
量)とを各位置毎に加算し、照射状況として図4に示す
ように表示装置6へグラフ表示31する。図4におい
て、斜線を付したグラフ部分が、これから行われる計測
でのX線照射データ分を示す。この時、上記加算値が予
め決められた最大照射限度量MAXを超えた場合に、そ
の旨を報知、例えば表示装置6へ警告文を表示したり、
警告音を鳴らしたり、更には、計測条件入力装置8へ信
号を送ってそれ以上操作が先へ進まないように、特に計
測(X線照射スタート)ができないように、することも
可能である。The prediction / warning device 7 reads the dose of X-rays irradiated by the previous measurement from the storage device 5, and the data and the X-ray irradiation data (from the input device 8 in the measurement to be performed from now on) ( (Estimated irradiation dose for each irradiation site) is added for each position, and the irradiation state is displayed as a graph 31 on the display device 6 as shown in FIG. In FIG. 4, the shaded graph portion shows the X-ray irradiation data in the measurement to be performed. At this time, when the added value exceeds a predetermined maximum irradiation limit amount MAX, a notification to that effect is given, for example, a warning text is displayed on the display device 6,
It is also possible to emit a warning sound, or send a signal to the measurement condition input device 8 so that the operation does not proceed further, and in particular, measurement (X-ray irradiation start) cannot be performed.
【0017】なお、線量積算の単位は、一般的にはX線
CT装置による1回の検査であり、記憶装置5の記憶値
のクリアは、一般的にはX線CT装置による1回の検査
終了毎となる。The unit of dose integration is generally one inspection by the X-ray CT apparatus, and clearing the stored value of the storage device 5 is generally one inspection by the X-ray CT apparatus. Every time it ends.
【0018】[0018]
【発明の効果】以上説明したように本発明によれば、被
検体へのX線の現在までの照射線量(積算値)と、これ
から行われようとするX線照射における照射線量予想値
との加算値を表示装置や警告音発生装置等の報知装置を
通して操作者に報知するようにしたので、操作者の無配
慮や不注意による被検体に対する過剰なX線照射を防止
することができるという効果がある。As described above, according to the present invention, the irradiation dose (integrated value) of the X-ray to the subject up to the present time and the irradiation dose predicted value in the X-ray irradiation to be performed from now are calculated. Since the added value is notified to the operator through a notification device such as a display device or a warning sound generator, it is possible to prevent excessive X-ray irradiation of the subject due to carelessness or carelessness of the operator. There is.
【図1】本発明装置の一実施例の要部を示すブロック図
である。FIG. 1 is a block diagram showing a main part of an embodiment of a device of the present invention.
【図2】同上装置におけるX線照射量積算方法の一例を
説明するための図である。FIG. 2 is a diagram for explaining an example of an X-ray irradiation amount integrating method in the same apparatus.
【図3】同上装置におけるX線照射量のグラフ表示例を
示す図である。FIG. 3 is a diagram showing an example of a graph display of an X-ray irradiation dose in the same apparatus.
【図4】同上装置における予想X線照射量を含めたX線
照射量のグラフ表示例を示す図である。FIG. 4 is a diagram showing an example of a graph display of an X-ray irradiation dose including an expected X-ray irradiation dose in the same apparatus.
1 X線管 2 扇状X線 3 寝台 4 X線照射量積算装置 5 記憶装置 6 表示装置 7 照射線量の予想・警告装置 8 計測条件入力装置 31 グラフ表示 1 X-ray tube 2 Fan-shaped X-ray 3 Bed 4 X-ray dose integration device 5 Storage device 6 Display device 7 Irradiation dose prediction / warning device 8 Measurement condition input device 31 Graph display
Claims (1)
て積算して記憶すると共に、これから行われようとする
X線照射において各々の照射部位における照射線量予想
値を計算してそれまでの積算値に加算し、その加算値を
表示する照射状況表示手段と、各々の照射部位における
前記加算値が予め決められた最大照射限度量を超えた場
合にその旨を報知する報知手段を具備することを特徴と
するX線CT装置。1. An X-ray dose irradiated is integrated and stored in each irradiation site, and an expected dose of each irradiation site is calculated in X-ray irradiation which is about to be performed, and integration is performed up to that time. An irradiation condition display means for adding the value to the value and displaying the added value, and a notification means for notifying that the added value at each irradiation site exceeds a predetermined maximum irradiation limit amount. X-ray CT device characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02186794A JP3483157B2 (en) | 1994-01-24 | 1994-01-24 | X-ray CT system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP02186794A JP3483157B2 (en) | 1994-01-24 | 1994-01-24 | X-ray CT system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07204196A true JPH07204196A (en) | 1995-08-08 |
JP3483157B2 JP3483157B2 (en) | 2004-01-06 |
Family
ID=12067083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP02186794A Expired - Lifetime JP3483157B2 (en) | 1994-01-24 | 1994-01-24 | X-ray CT system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3483157B2 (en) |
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