JP2000300549A - X-ray ct apparatus - Google Patents
X-ray ct apparatusInfo
- Publication number
- JP2000300549A JP2000300549A JP11114396A JP11439699A JP2000300549A JP 2000300549 A JP2000300549 A JP 2000300549A JP 11114396 A JP11114396 A JP 11114396A JP 11439699 A JP11439699 A JP 11439699A JP 2000300549 A JP2000300549 A JP 2000300549A
- Authority
- JP
- Japan
- Prior art keywords
- ray
- image
- speed
- images
- same time
- 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
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 10
- 230000000747 cardiac effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000003384 imaging method Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
- A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/027—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis characterised by the use of a particular data acquisition trajectory, e.g. helical or spiral
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
- Image Processing (AREA)
- Closed-Circuit Television Systems (AREA)
- Image Analysis (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、Ｘ線ＣＴ（Comput
er Tomography）装置に関し、更に詳しくは、被検体の
心拍数に影響されることなく、同一位相の心臓画像を所
望の画像間隔で得ることが出来るＸ線ＣＴ装置に関す
る。The present invention relates to an X-ray CT (Computing
More specifically, the present invention relates to an X-ray CT apparatus capable of obtaining cardiac images of the same phase at desired image intervals without being affected by the heart rate of the subject.
【０００２】[0002]
【従来の技術】従来、Ｘ線管およびＸ線検出器を被検体
の周りに回転させ且つその回転中心軸方向に直線的に被
検体を乗せたテーブルを移動させながらデータを収集
し、被検体の心電波形と関連させて記録し、前記データ
から心電波形の同一時相の各位置での画像をそれぞれ再
構成し、同一位相で位置の異なる複数の心臓画像を得る
ことが行われている。2. Description of the Related Art Conventionally, data is collected by rotating an X-ray tube and an X-ray detector around a subject and moving a table on which the subject is linearly moved in the direction of the rotation center axis. Recorded in association with the electrocardiographic waveform of the electrocardiographic waveform, the images at the same time phase of each position of the electrocardiographic waveform are reconstructed from the data to obtain a plurality of cardiac images at the same phase but at different positions. I have.
【０００３】[0003]
【発明が解決しようとする課題】上記のように同一位相
で位置の異なる複数の心臓画像を得る場合に、テーブル
の移動速度をＶｃとし、心拍周期をＴとするとき、心臓
が同一位相に戻るまでの間にテーブルがＶｃ・Ｔだけ移
動する。従って、同一位相の画像間隔Ｄは、Ｄ＝Ｖｃ・
Ｔとなる。ここで、テーブル速度Ｖｃは一定であるが、
心拍周期Ｔ（すなわち、心拍数）は、被検体の状態によ
り異なり、また、被検体により異なる。このため、心拍
数の変化によって画像間隔Ｄが変動し、所望の画像間隔
にならない問題点があった。When a plurality of heart images at the same phase but different positions are obtained as described above, the heart returns to the same phase when the moving speed of the table is Vc and the cardiac cycle is T. The table moves by Vc · T during the period. Therefore, the image interval D of the same phase is D = Vc ·
It becomes T. Here, although the table speed Vc is constant,
The cardiac cycle T (that is, the heart rate) varies depending on the state of the subject, and varies depending on the subject. For this reason, there has been a problem that the image interval D fluctuates due to a change in the heart rate, and the desired image interval cannot be obtained.
【０００４】図６〜図８は、上記問題点を具体的に示し
た説明図である。図６に示すように、短い心拍周期Ｔｆ
の場合は短いテーブル移動距離Ｄｆとなり、長い心拍周
期Ｔｓの場合は長いテーブル移動距離Ｄｓとなる。この
ため、図７に示すように、短い心拍周期Ｔｆの場合は、
狭い画像間隔Ｄｆとなる。また、図８に示すように、長
い心拍周期Ｔｓの場合は、広い画像間隔Ｄｓとなる。FIGS. 6 to 8 are explanatory diagrams specifically showing the above problems. As shown in FIG. 6, the short cardiac cycle Tf
In the case of, the table movement distance Df is short, and in the case of the long heartbeat period Ts, the table movement distance Ds is long. For this reason, as shown in FIG. 7, in the case of a short cardiac cycle Tf,
This results in a narrow image interval Df. Further, as shown in FIG. 8, in the case of a long heartbeat period Ts, the image interval Ds is wide.
【０００５】そこで、本発明の目的は、被検体の心拍数
に影響されることなく、同一位相の心臓画像を所望の画
像間隔で得ることが出来るＸ線ＣＴ装置を提供すること
にある。SUMMARY OF THE INVENTION It is an object of the present invention to provide an X-ray CT apparatus capable of obtaining cardiac images having the same phase at desired image intervals without being affected by the heart rate of the subject.
【０００６】[0006]
【課題を解決するための手段】第１の観点では、本発明
は、Ｘ線管またはＸ線検出器の少なくとも一方を撮影対
象の周りに相対回転させ且つその回転中心軸方向に直線
的に相対移動させながらデータを収集するヘリカルスキ
ャン手段と、撮像対象の周期的運動の同一時相の各位置
での画像をそれぞれ再構成する同一時相画像再構成手段
と、前記同一時相の画像が一定間隔になるように前記直
線的に相対移動させる速度を制御する直線移動速度制御
手段とを具備したことを特徴とするＸ線ＣＴ装置を提供
する。上記第１の観点によるＸ線ＣＴ装置では、ヘリカ
ルスキャン時の直線的相対移動速度を撮影対象の周期的
運動の周期に合わせて可変とした。これにより、周期の
変化に影響されることなく、同一時相の画像を一定間隔
で得られるようになる。According to a first aspect, the present invention provides a method of rotating at least one of an X-ray tube and an X-ray detector relatively around an object to be imaged and linearly rotating the X-ray tube or X-ray detector in a direction of a rotation center axis thereof. Helical scanning means for collecting data while moving, same time phase image reconstructing means for reconstructing images at respective positions in the same time phase of the periodic motion of the imaging target, and images of the same time phase being constant An X-ray CT apparatus comprising: a linear movement speed control unit that controls the speed of the linear relative movement so as to provide an interval. In the X-ray CT apparatus according to the first aspect, the linear relative movement speed during the helical scan is made variable in accordance with the period of the periodic movement of the imaging target. As a result, images at the same time phase can be obtained at regular intervals without being affected by a change in the cycle.
【０００７】第２の観点では、本発明は、上記第１の観
点のＸ線ＣＴ装置において、操作者が所望の画像間隔Ｄ
を入力するための画像間隔入力手段と、前記周期的運動
の周期Ｔを測定する周期測定手段とを具備し、前記直線
移動速度制御手段は、直線的に相対移動させる速度Ｖを
Ｖ＝Ｄ／Ｔとすることを特徴とするＸ線ＣＴ装置を提供
する。上記第２の観点によるＸ線ＣＴ装置では、操作者
が所望の画像間隔Ｄを入力すれば、その画像間隔Ｄと測
定した周期Ｔとに合わせて自動的にヘリカルスキャン時
の直線的相対移動速度Ｖが設定されるため、周期の変化
に影響されることなく、同一時相の画像を所望の間隔で
得られるようになる。According to a second aspect, the present invention relates to the X-ray CT apparatus according to the first aspect, wherein an operator sets a desired image interval D.
And a period measuring unit for measuring the period T of the periodic movement, wherein the linear moving speed control unit sets the speed V of linear relative movement to V = D / An X-ray CT apparatus characterized by T is provided. In the X-ray CT apparatus according to the second aspect, when an operator inputs a desired image interval D, the linear relative movement speed during helical scan is automatically adjusted in accordance with the image interval D and the measured period T. Since V is set, images at the same time phase can be obtained at desired intervals without being affected by changes in the period.
【０００８】[0008]
【発明の実施の形態】以下、図に示す本発明の実施の形
態により本発明をさらに詳しく説明する。なお、これに
より本発明が限定されるものではない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments of the present invention shown in the drawings. Note that the present invention is not limited by this.
【０００９】−第１の実施形態− 図１は、本発明の第１の実施形態にかかるＸ線ＣＴ装置
を示すブロック図である。このＸ線ＣＴ装置１００は、
操作コンソール１と、テーブル装置１０と、走査ガント
リ２０と、心電計３０とを具備している。First Embodiment FIG. 1 is a block diagram showing an X-ray CT apparatus according to a first embodiment of the present invention. This X-ray CT apparatus 100
An operation console 1, a table device 10, a scanning gantry 20, and an electrocardiograph 30 are provided.
【００１０】前記操作コンソール１は、操作者の指示や
情報などを受け付ける入力装置２と、心拍同期テーブル
速度自動設定処理（図２）やヘリカルスキャン処理や画
像再構成処理などを実行する中央処理装置３と、制御信
号などの送受信をテーブル装置１０や走査ガントリ２０
との間で行う制御インタフェース４と、走査ガントリ２
０で取得したデータを収集するデータ収集バッファ５
と、Ｘ線画像などを表示するＣＲＴ６と、プログラムや
データを記憶する記憶装置７とを具備している。The operation console 1 includes an input device 2 for receiving instructions and information from an operator, and a central processing unit for executing a heartbeat synchronization table speed automatic setting process (FIG. 2), a helical scan process, an image reconstruction process, and the like. 3 and a table device 10 and a scanning gantry 20 for transmitting and receiving control signals and the like.
A control interface 4 between the scanning gantry 2
Data collection buffer 5 for collecting data acquired at 0
And a CRT 6 for displaying an X-ray image and the like, and a storage device 7 for storing programs and data.
【００１１】前記テーブル装置１０は、被検体を乗せて
前記走査ガントリ２０のボア（中空洞部）に入れ出しす
るクレードル１２を具備している。クレードル１２は、
テーブル装置１０に内蔵するモータで駆動される。この
クレードル１２の移動速度が、テーブル移動速度Ｖであ
る。The table apparatus 10 includes a cradle 12 for placing a subject on the gantry 20 and taking it into and out of a bore (middle cavity) of the scanning gantry 20. Cradle 12
It is driven by a motor built in the table device 10. The moving speed of the cradle 12 is the table moving speed V.
【００１２】前記走査ガントリ２０は、図示しないが、
Ｘ線管，コリメータ，Ｘ線コントローラ，検出器，デー
タ収集部，被検体の周りにＸ線管などを回転させる回転
コントローラなどを具備している。Although the scanning gantry 20 is not shown,
The apparatus includes an X-ray tube, a collimator, an X-ray controller, a detector, a data acquisition unit, a rotation controller for rotating the X-ray tube around the subject, and the like.
【００１３】前記心電計３０は、被検体からＥＣＧ信号
を検出して前記中央処理装置３に入力する。The electrocardiograph 30 detects an ECG signal from a subject and inputs it to the central processing unit 3.
【００１４】図２は、前記中央処理装置３が実行する心
拍同期テーブル速度自動設定処理のフロー図である。ス
テップＳ１では、前記入力装置２から所望の画像間隔Ｄ
を操作者が入力するのを受け付ける。ステップＳ２で
は、前記ＥＣＧ信号から心拍数を求め、その心拍数から
心拍周期Ｔを算出する。ステップＳ３では、Ｖ＝Ｄ／
（ｎ・Ｔ）より、テーブル速度Ｖを算出する。ここで、
ｎは、通常は“１”であるが、“１”以外の自然数とし
てもよい。ステップＳ４では、ヘリカルスキャン時のテ
ーブル速度Ｖを設定する。そして、ヘリカルスキャン中
に、前記ステップＳ２〜Ｓ４を繰り返すことで、テーブ
ル速度Ｖをリアルタイムに制御する。FIG. 2 is a flow chart of the heart rate synchronization table speed automatic setting process executed by the central processing unit 3. In step S1, a desired image interval D is input from the input device 2.
Is input by the operator. In step S2, a heart rate is obtained from the ECG signal, and a heart cycle T is calculated from the heart rate. In step S3, V = D /
The table speed V is calculated from (n · T). here,
n is normally “1”, but may be a natural number other than “1”. In step S4, the table speed V at the time of the helical scan is set. The table speed V is controlled in real time by repeating steps S2 to S4 during the helical scan.
【００１５】上記心拍同期テーブル速度自動設定処理の
結果、図３に示すように、短い心拍周期Ｔｆの場合は比
較的高速のテーブル速度Ｖｆとなり、長い心拍周期Ｔｓ
の場合は比較的低速のテーブル速度Ｖｓとなる。すなわ
ち、テーブル移動距離Ｄは、短い心拍周期Ｔｆでも長い
心拍周期Ｔｓでも一定になる。このため、図４に示すよ
うに、心拍周期Ｔの長短にかかわらず、同一位相の心臓
画像が、所望の画像間隔Ｄで得られることとなる。As a result of the above-described automatic heartbeat synchronization table speed setting processing, as shown in FIG. 3, in the case of a short heartbeat period Tf, the table speed Vf becomes relatively high and the long heartbeat period Ts
In this case, the table speed Vs is relatively low. That is, the table moving distance D is constant both in the short heartbeat cycle Tf and in the long heartbeat cycle Ts. Therefore, as shown in FIG. 4, a heart image having the same phase can be obtained at a desired image interval D regardless of the length of the cardiac cycle T.
【００１６】−第２の実施形態− 第２の実施形態では、図２の心拍同期テーブル速度自動
設定処理に代えて、図５の心拍同期テーブル速度手動設
定処理を実行する。図５のステップＳ１では、前記入力
装置２から所望の画像間隔Ｄを操作者が入力するのを受
け付ける。ステップＳ２’では、前記入力装置２から所
望の画像間隔Ｄを操作者が入力するのを受け付ける。前
記ＥＣＧ信号から心拍数を求め、その心拍数から心拍周
期Ｔを算出する。ステップＳ３では、Ｖ＝Ｄ／Ｔより、
テーブル速度Ｖを算出する。ステップＳ４では、操作者
が入力したスキャン時間τとスライス厚Ｗとから、スキ
ャンピッチＰを、Ｐ＝Ｖ・τ／Ｗで算出し、これを操作
者に示し、このスキャンピッチＰを操作者が入力するこ
とで、ヘリカルスキャン時のテーブル速度Ｖを設定す
る。Second Embodiment In the second embodiment, a heartbeat synchronization table speed manual setting process shown in FIG. 5 is executed instead of the heartbeat synchronization table speed automatic setting process shown in FIG. In step S1 of FIG. 5, the input of a desired image interval D from the input device 2 by the operator is accepted. In step S2 ', an input of a desired image interval D from the input device 2 by an operator is accepted. A heart rate is obtained from the ECG signal, and a heart cycle T is calculated from the heart rate. In step S3, from V = D / T,
The table speed V is calculated. In step S4, a scan pitch P is calculated by P = V · τ / W from the scan time τ and the slice thickness W input by the operator, and this is shown to the operator, and this scan pitch P is displayed by the operator. By inputting, the table speed V at the time of the helical scan is set.
【００１７】上記心拍同期テーブル速度手動設定処理の
結果、心拍周期Ｔの長短にかかわらず、同一位相の心臓
画像が、所望の画像間隔Ｄで得られることとなる。As a result of the heart rate synchronization table speed manual setting process, a heart image having the same phase can be obtained at a desired image interval D regardless of the length of the heartbeat period T.
【００１８】[0018]
【発明の効果】本発明のＸ線ＣＴ装置によれば、ヘリカ
ルスキャン時の直線的相対移動速度を撮影対象の周期的
運動の周期に合わせて可変としたため、周期の変化に影
響されることなく、同一時相の画像が一定間隔で得られ
るようになる。そして、同一時相の複数の画像の密度を
一定にできるため、リフォーメーション画像や３Ｄ画像
を作成する場合の画質を一定に維持できるようになる。According to the X-ray CT apparatus of the present invention, the linear relative movement speed during the helical scan is made variable in accordance with the period of the periodic movement of the object to be photographed. , Images of the same time phase can be obtained at regular intervals. Since the density of a plurality of images at the same time phase can be kept constant, the image quality when a reformed image or a 3D image is created can be kept constant.
【図１】本発明の一実施形態のＸ線ＣＴ装置のブロック
図である。FIG. 1 is a block diagram of an X-ray CT apparatus according to an embodiment of the present invention.
【図２】本発明の第１の実施形態にかかる心拍同期テー
ブル速度自動設定処理のフロー図である。FIG. 2 is a flowchart of a heartbeat synchronization table speed automatic setting process according to the first embodiment of the present invention.
【図３】本発明における心拍周期とテーブル速度とテー
ブル移動距離の説明図である。FIG. 3 is an explanatory diagram of a heartbeat cycle, a table speed, and a table moving distance in the present invention.
【図４】テーブル移動距離と画像間隔の説明図である。FIG. 4 is an explanatory diagram of a table moving distance and an image interval.
【図５】本発明の第２の実施形態にかかる心拍同期テー
ブル速度手動設定処理のフロー図である。FIG. 5 is a flowchart of a heartbeat synchronization table speed manual setting process according to the second embodiment of the present invention.
【図６】従来の心拍周期とテーブル速度とテーブル移動
距離の説明図である。FIG. 6 is an explanatory diagram of a conventional heartbeat cycle, table speed, and table moving distance.
【図７】心拍周期が短い場合の従来のテーブル移動距離
と画像間隔の説明図である。FIG. 7 is an explanatory diagram of a conventional table moving distance and an image interval when a heartbeat cycle is short.
【図８】心拍周期が長い場合の従来のテーブル移動距離
と画像間隔の説明図である。FIG. 8 is an explanatory diagram of a conventional table moving distance and an image interval when a heartbeat cycle is long.
１００ Ｘ線ＣＴ装置 １ 操作コンソール ２ 入力装置 ３ 中央処理装置 ４ 制御インタフェース １０ テーブル装置 ２０ 走査ガントリ ３０ 心電計 REFERENCE SIGNS LIST 100 X-ray CT apparatus 1 Operation console 2 Input device 3 Central processing unit 4 Control interface 10 Table device 20 Scanning gantry 30 Electrocardiograph
───────────────────────────────────────────────────── フロントページの続き (72)発明者 郷野 誠 東京都日野市旭ケ丘４丁目７番地の127ジ ーイー横河メディカルシステム株式会社内 Ｆターム(参考） 4C093 AA22 BA10 CA50 DA02 EE30 FA34 FA36 FA47 FA56 5B057 AA08 AA09 BA03 BA19 BA21 5C054 AA01 AA06 CA02 CC01 CF07 EA01 HA12 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Makoto Gono 127 JE Yokogawa Medical System Co., Ltd., 4-7 Asahigaoka, Hino-shi, Tokyo F-term (reference) 4C093 AA22 BA10 CA50 DA02 EE30 FA34 FA36 FA47 FA56 5B057 AA08 AA09 BA03 BA19 BA21 5C054 AA01 AA06 CA02 CC01 CF07 EA01 HA12
Claims (2)
方を撮影対象の周りに相対回転させ且つその回転中心軸
方向に直線的に相対移動させながらデータを収集するヘ
リカルスキャン手段と、撮像対象の周期的運動の同一時
相の各位置での画像をそれぞれ再構成する同一時相画像
再構成手段と、前記同一時相の画像が一定間隔になるよ
うに前記直線的に相対移動させる速度を制御する直線移
動速度制御手段とを具備したことを特徴とするＸ線ＣＴ
装置。1. A helical scanning means for collecting data while relatively rotating at least one of an X-ray tube and an X-ray detector around an object to be imaged and relatively linearly moving in a direction of a center axis of the rotation. The same time phase image reconstructing means for reconstructing images at respective positions of the same time phase of the periodic motion, and the speed of relative linear movement so that the images of the same time phase are at constant intervals. X-ray CT having linear movement speed control means for controlling
apparatus.
て、操作者が所望の画像間隔Ｄを入力するための画像間
隔入力手段と、前記周期的運動の周期Ｔを測定する周期
測定手段とを具備し、前記直線移動速度制御手段は、直
線的に相対移動させる速度ＶをＶ＝Ｄ／Ｔとすることを
特徴とするＸ線ＣＴ装置。2. An X-ray CT apparatus according to claim 1, further comprising: an image interval input unit for inputting a desired image interval D by an operator; and a period measuring unit for measuring a period T of the periodic motion. An X-ray CT apparatus, wherein the linear movement speed control means sets the speed V for linear relative movement to V = D / T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11439699A JP4336415B2 (en) | 1999-04-22 | 1999-04-22 | X-ray CT system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11439699A JP4336415B2 (en) | 1999-04-22 | 1999-04-22 | X-ray CT system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000300549A true JP2000300549A (en) | 2000-10-31 |
| JP4336415B2 JP4336415B2 (en) | 2009-09-30 |
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| JP11439699A Expired - Fee Related JP4336415B2 (en) | 1999-04-22 | 1999-04-22 | X-ray CT system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007144047A (en) * | 2005-11-30 | 2007-06-14 | Ge Medical Systems Global Technology Co Llc | X-ray ct apparatus and method for controlling the same |
| JP2009172397A (en) * | 2002-02-27 | 2009-08-06 | Toshiba Corp | X-ray computer tomography apparatus |
| JP2011251192A (en) * | 2011-09-16 | 2011-12-15 | Toshiba Corp | X-ray ct device |
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1999
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009172397A (en) * | 2002-02-27 | 2009-08-06 | Toshiba Corp | X-ray computer tomography apparatus |
| JP2007144047A (en) * | 2005-11-30 | 2007-06-14 | Ge Medical Systems Global Technology Co Llc | X-ray ct apparatus and method for controlling the same |
| NL1032967C2 (en) * | 2005-11-30 | 2007-11-23 | Ge Med Sys Global Tech Co Llc | X-ray CT equipment and method of controlling it. |
| JP4639143B2 (en) * | 2005-11-30 | 2011-02-23 | ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー | X-ray CT apparatus and control method thereof |
| JP2011251192A (en) * | 2011-09-16 | 2011-12-15 | Toshiba Corp | X-ray ct device |
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| JP4336415B2 (en) | 2009-09-30 |
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