JPH05130984A - X-ray ct device - Google Patents

X-ray ct device

Info

Publication number
JPH05130984A
JPH05130984A JP3299115A JP29911591A JPH05130984A JP H05130984 A JPH05130984 A JP H05130984A JP 3299115 A JP3299115 A JP 3299115A JP 29911591 A JP29911591 A JP 29911591A JP H05130984 A JPH05130984 A JP H05130984A
Authority
JP
Japan
Prior art keywords
slice direction
image
ray
testee
scan
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.)
Pending
Application number
JP3299115A
Other languages
Japanese (ja)
Inventor
Yasuo Shinoda
泰雄 信太
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP3299115A priority Critical patent/JPH05130984A/en
Publication of JPH05130984A publication Critical patent/JPH05130984A/en
Pending legal-status Critical Current

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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
    • A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
    • A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
    • A61B6/5229—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image
    • A61B6/5235—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image combining images from the same or different ionising radiation imaging techniques, e.g. PET and CT
    • A61B6/5241—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image combining images from the same or different ionising radiation imaging techniques, e.g. PET and CT combining overlapping images of the same imaging modality, e.g. by stitching

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Medical Informatics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Physics & Mathematics (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Optics & Photonics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Radiology & Medical Imaging (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)

Abstract

PURPOSE:To secure slice width even when applying a two-dimensional detector limited in the length in a slice direction and to prevent the configuration of the device from being complicated by providing this device with an X-ray generating source, the two-dimensional detector to detect X rays transmitted through a testee and bed to move the testee in the slice direction during scanning. CONSTITUTION:This device is equipped with an X-ray tube ball 1 to radiate X rays to the testee, image intensifier 2 to detect X rays transmitted through the testee, and bed to move the testee P in the slice direction during scanning. An image reconstituting device 4 reconstitutes plural tomographic images and reconstitutes the plural tomographic images as a continuous image by calculating the required number of times of scan from a designated photographic area in the slice direction and executing the calculated times of scanning. Further, the image is reconstituted by executing overlap scan in the slice direction as needed and executing an interpolation processing to obtained data.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明はＸ線ＣＴ装置に関し、特
に、一回のスキャンで複数枚の断層像を再構成すること
ができるＸ線ＣＴ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray CT apparatus, and more particularly to an X-ray CT apparatus capable of reconstructing a plurality of tomographic images with one scan.

【０００２】[0002]

【従来の技術】一般に、Ｘ線ＣＴ装置はＸ線管と１次元
検出器とを備えており、Ｘ線管から発生し被検体を透過
したＸ線を検出することにより、一回のスキャンで一枚
の断層像を得るものである。このようなＸ線ＣＴ装置に
対して、検出器として２次元検出器を適用し、一回のス
キャンで多スライスの撮影データを収集することによっ
て、複数枚の断層像を再構成することができるＸ線ＣＴ
装置が考えられている。2. Description of the Related Art Generally, an X-ray CT apparatus is equipped with an X-ray tube and a one-dimensional detector, and by detecting X-rays generated from the X-ray tube and transmitted through an object, one scan can be performed. This is to obtain one tomographic image. By applying a two-dimensional detector as a detector to such an X-ray CT apparatus and collecting imaging data of multiple slices in one scan, a plurality of tomographic images can be reconstructed. X-ray CT
The device is considered.

【０００３】[0003]

【発明が解決しようとする課題】しかしながら、２次元
検出器として適用できるイメージインテンシファイア
（以下Ｉ．Ｉと記す）は、その構造的な制約があり、一
回のスキャンで診断したい撮影領域をすべてカバーでき
るだけの十分なスライス方向の長さを持つことができな
い。また、一回のスキャンで多スライスの撮影データを
収集しようとすると、一回のスキャンで得ることのでき
る収集データ量（チャンネル数×スライス数）が増えて
しまうため、データ収集系の高速化を図る必要があると
いう問題があった。However, the image intensifier (hereinafter referred to as II) applicable as a two-dimensional detector has a structural limitation, and the imaging region to be diagnosed by one scan is limited. It cannot have enough slice length to cover everything. Also, when attempting to collect imaging data of multiple slices in one scan, the amount of collected data (number of channels x number of slices) that can be obtained in one scan increases, so speeding up the data acquisition system. There was a problem that it had to be addressed.

【０００４】本発明は上記した従来技術の課題を解決す
るためになされたもので、その目的とするところは、ス
ライス方向に限られた長さの２次元検出器を適用しても
必要なスライス巾を確保することができ、かつデータ収
集系の構成が複雑になることのないＸ線ＣＴ装置を提供
することにある。The present invention has been made in order to solve the above-mentioned problems of the prior art, and its object is to obtain a slice which is necessary even if a two-dimensional detector having a limited length in the slice direction is applied. An object of the present invention is to provide an X-ray CT apparatus that can secure the width and does not complicate the configuration of the data acquisition system.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するため
に、本発明にあっては、被検体に対しＸ線を曝射するＸ
線発生源と、被検体を透過したＸ線を検出する２次元検
出器と、スキャンとスキャンとの間に被検体をスライス
方向に移動させる寝台と、を具備することを特徴とす
る。また、指定されたスライス方向の撮影領域から必要
なスキャン回数を求め、該スキャン回数のスキャンを行
うことにより複数の断層像を再構成し、前記複数の断層
像をスライス方向に連続した３次元画像として再構成す
る画像再構成手段を具備することを特徴とする。さら
に、必要に応じてスライス方向にオーバーラップスキャ
ンを行い、該オーバーラップスキャンにより得られたデ
ータを補間処理することにより画像を再構成する画像再
構成手段を具備することを特徴とする。In order to achieve the above object, in the present invention, an X-ray that irradiates a subject with X-rays is used.
It is characterized by comprising a radiation source, a two-dimensional detector for detecting X-rays transmitted through the subject, and a bed for moving the subject in the slice direction between scans. Further, the required number of scans is obtained from the designated imaging region in the slice direction, a plurality of tomographic images are reconstructed by performing the scans of the number of scans, and the plurality of tomographic images are three-dimensional images continuous in the slice direction. And an image reconstructing means for reconstructing the image. Further, it is characterized by comprising an image reconstructing unit for reconstructing an image by performing overlap scan in the slice direction as necessary and interpolating data obtained by the overlap scan.

【０００６】[0006]

【作用】上記構成を有する本発明のＸ線ＣＴ装置におい
ては、２次元検出器を用いたマルチスライスのスキャン
と寝台移動とを組み合わせて、必要なスライス巾まで連
続スキャンすることによりデータを収集し、このデータ
を継合せて所望の画像を再構成することができる。ま
た、必要に応じて画像の継ぎ目をオーバーラップスキャ
ンし、このオーバーラップスキャンにより得られたデー
タを補間処理することによって、連続的な３次元画像を
再構成することが可能である。In the X-ray CT apparatus of the present invention having the above-mentioned structure, data is collected by combining multi-slice scanning using a two-dimensional detector and bed movement and continuously scanning to a required slice width. , This data can be stitched together to reconstruct the desired image. Further, it is possible to reconstruct a continuous three-dimensional image by performing an overlap scan on the seams of images and interpolating the data obtained by this overlap scan as necessary.

【０００７】[0007]

【実施例】以下に本発明の一実施例を図に基づいて説明
する。An embodiment of the present invention will be described below with reference to the drawings.

【０００８】図１は本発明が適用された一実施例のＸ線
ＣＴ装置におけるＸ線管球とＩ．Ｉとを示す構成図、図
２は、本発明が適用された一実施例のＸ線ＣＴ装置の概
略構成を示すブロック図である。図１、図２において、
この一実施例のＸ線ＣＴ装置は、Ｘ線管球１とＩ．Ｉ２
とが寝台（図示せず）上の被検体Ｐを挟んで対向配置さ
れることによって架台が構成されている。そして、Ｘ線
管球１から曝射され被検体Ｐを透過したＸ線は、Ｉ．Ｉ
２によって検出され、データ収集装置３によってデータ
収集されるものである。このよにして収集されたデータ
を基にして画像再構成装置４によって断層像が再構成さ
れ、この断層像は画像表示装置５の画面上に表示される
ものである。そして、システム制御装置６は、架台及び
寝台の制御を行う架台・寝台制御装置７、画像再構成装
置４等の制御を行うものである。また、Ｉ．Ｉ２は短手
方向にチャンネル数Ｎ、長手方向にスライス数Ｍ、スラ
イス方向の検出視野長ｌの２次元検出器であり、一回の
スキャンで図３に示すデータを得ることができるもので
ある。ここで、Ｍ≧２である。FIG. 1 shows an X-ray tube in an X-ray CT apparatus and an I.D. 2 is a block diagram showing a schematic configuration of an X-ray CT apparatus of one embodiment to which the present invention is applied. 1 and 2,
The X-ray CT apparatus of this embodiment includes an X-ray tube 1 and an I.D. I2
The gantry and the pedestal are configured by being opposed to each other with the subject P on the bed (not shown) in between. The X-rays emitted from the X-ray tube 1 and transmitted through the subject P are I.P. I
2 is detected and data is collected by the data collecting device 3. A tomographic image is reconstructed by the image reconstructing device 4 based on the data thus collected, and this tomographic image is displayed on the screen of the image display device 5. The system control device 6 controls the gantry / bed control device 7, which controls the gantry and the bed, the image reconstruction device 4, and the like. In addition, I.D. I2 is a two-dimensional detector having the number of channels N in the lateral direction, the number of slices M in the longitudinal direction, and the detection field length 1 in the slice direction, and the data shown in FIG. 3 can be obtained by one scan. .. Here, M ≧ 2.

【０００９】このような構成により、Ｉ．Ｉ２を用いた
マルチスライスのスキャンを行いつつ、スキャンとスキ
ャンとの間に寝台を移動させ、必要なスライス巾まで連
続スキャンすることによりデータを収集する。また、必
要に応じて画像の継ぎ目をオーバーラップスキャンし、
このオーバーラップスキャンにより得られたデータを補
間処理する。With such a configuration, the I.D. Data is collected by performing multi-slice scanning using I2, moving the bed between scans, and performing continuous scanning up to the required slice width. Also, if necessary, overlap scan the seams of the images,
The data obtained by this overlap scan is interpolated.

【００１０】スライス方向に長さＬ（Ｌ＞ｌ）の撮影領
域が指定され、Δｌだけオーバーラップさせてスキャン
を行う場合、即ちスキャンとスキャンとの間に被検体を
ｌ−Δｌだけ移動させる場合、そのとき必要なスキャン
回数をｓとすると、 ｓｌ−（ｓ−１）Δｌ＞Ｌ …（１） なる関係があり、これによりスキャン回数ｓはWhen an imaging region having a length L (L> l) is designated in the slice direction and scanning is performed by overlapping by Δl, that is, when the subject is moved by l-Δl between scans. , And the number of scans required at that time is s, there is a relation that sl- (s-1) Δl> L (1), and thus the number of scans s is

【００１１】[0011]

【数１】 [Equation 1]

【００１２】を満たす最小の整数として求めることがで
きる。このようにしてスキャン回数ｓを求め、ｓ回のス
キャンを行い、各スキャンによって得られた画像をスラ
イス方向に連続して表示する。It can be obtained as the smallest integer that satisfies the above. In this way, the number of scans s is obtained, s scans are performed, and the images obtained by each scan are continuously displayed in the slice direction.

【００１３】しかし、一般的にはスキャンとスキャンと
の間に呼吸等の動作が入るため、被検体Ｐ内部の位置を
正確に再現することは困難である。However, it is difficult to accurately reproduce the position inside the subject P because an action such as breathing generally enters between scans.

【００１４】そこで、オーバーラップ分のデータに対し
て補間処理を施してスライス方向のデータの連続性を得
ることにより連続した画像を得ることができる。Therefore, a continuous image can be obtained by performing interpolation processing on the overlapping data to obtain continuity of the data in the slice direction.

【００１５】補間処理の方法としては、例えば、図４に
示すように、Δｌが１スライス分に相当する場合に単純
平均を行うときには、第一スキャンの第Ｍスライス及び
第二スキャンの第１スライスのデータを対応するチャン
ネル毎に平均値をとり、このデータを第一スキャンの第
Ｍスライスのデータとする。また、単純平均以外の補間
処理の方法として、重み付けをしたり、移動平均をした
りしても良い。As a method of interpolation processing, for example, as shown in FIG. 4, when the simple averaging is performed when Δl corresponds to one slice, the Mth slice of the first scan and the first slice of the second scan are used. Data is averaged for each corresponding channel, and this data is used as the data of the Mth slice of the first scan. Further, as a method of interpolation processing other than simple averaging, weighting or moving average may be performed.

【００１６】本実施例においては、上記したように、ス
ライス方向に限られた長さの２次元検出器を用いても、
複数回のスキャンを行うことにより必要なスライス巾を
確保することができる。また、一回のスキャンで得る収
集データ量が増えないので、これによってデータ収集系
の構成が複雑になることがない。In the present embodiment, as described above, even if a two-dimensional detector having a limited length in the slice direction is used,
The necessary slice width can be secured by performing the scanning a plurality of times. Further, since the amount of collected data obtained by one scan does not increase, this does not complicate the configuration of the data collecting system.

【００１７】[0017]

【発明の効果】本発明のＸ線ＣＴ装置は以上の構成及び
作用を有するもので、スライス方向に限られた長さの２
次元検出器を用いても、複数回のスキャンを行うことに
より必要なスライス巾を確保することができる。また、
１回のスキャンで得る収集データ量が増えないので、こ
れによってデータ収集系の構成が複雑になることがな
い。The X-ray CT apparatus of the present invention has the above-mentioned structure and operation, and has a length limited to 2 in the slice direction.
Even if the dimension detector is used, the necessary slice width can be secured by performing the scanning a plurality of times. Also,
Since the amount of collected data obtained by one scan does not increase, this does not complicate the configuration of the data collection system.

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

【図１】本発明が適用された一実施例のＸ線ＣＴ装置に
おけるＸ線管球とＩ．Ｉとを示す構成図である。FIG. 1 shows an X-ray tube and an I.D. tube in an X-ray CT apparatus according to an embodiment of the present invention. It is a block diagram which shows I.

【図２】同実施例におけるＸ線ＣＴ装置の概略構成を示
すブロック図である。FIG. 2 is a block diagram showing a schematic configuration of an X-ray CT apparatus in the embodiment.

【図３】同実施例において、一回のスキャンで収集され
るデータを示す図である。FIG. 3 is a diagram showing data collected by one scan in the example.

【図４】同実施例において、オーバーラップスキャンで
収集されるデータを示す図である。FIG. 4 is a diagram showing data collected by an overlap scan in the example.

【符号の説明】[Explanation of symbols]

１ Ｘ線管球（Ｘ線発生源） ２ Ｉ．Ｉ（２次元検出器） ４ 画像再構成装置（画像再構成手段） Ｐ 被検体 1 X-ray tube (X-ray source) 2 I. I (two-dimensional detector) 4 Image reconstruction device (image reconstruction means) P Subject

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 被検体に対しＸ線を曝射するＸ線発生源
と、被検体を透過したＸ線を検出する２次元検出器と、
スキャンとスキャンとの間に被検体をスライス方向に移
動させる寝台と、を具備することを特徴とするＸ線ＣＴ
装置。1. An X-ray generation source that irradiates a subject with X-rays, and a two-dimensional detector that detects X-rays that have passed through the subject.
An X-ray CT, comprising: a bed for moving the subject in the slice direction between scans.
apparatus. 【請求項２】 指定されたスライス方向の撮影領域から
必要なスキャン回数を求め、該スキャン回数のスキャン
を行うことにより複数の断層像を再構成することを特徴
とする請求項１記載のＸ線ＣＴ装置。2. The X-ray according to claim 1, wherein a plurality of tomographic images are reconstructed by obtaining a necessary number of scans from a designated imaging region in the slice direction and performing the scans of the number of scans. CT device. 【請求項３】 前記複数の断層像をスライス方向に連続
した３次元画像として再構成する画像再構成手段を具備
することを特徴とする請求項１記載のＸ線ＣＴ装置。3. The X-ray CT apparatus according to claim 1, further comprising image reconstruction means for reconstructing the plurality of tomographic images as a three-dimensional image continuous in the slice direction. 【請求項４】 スライス方向にオーバーラップスキャン
を行い、該オーバーラップスキャンにより得られたデー
タを補間処理することにより画像を再構成する画像再構
成手段を具備することを特徴とする請求項１記載のＸ線
ＣＴ装置。4. The image reconstructing means for reconstructing an image by performing an overlap scan in a slice direction and interpolating data obtained by the overlap scan. X-ray CT system.
JP3299115A 1991-11-14 1991-11-14 X-ray ct device Pending JPH05130984A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3299115A JPH05130984A (en) 1991-11-14 1991-11-14 X-ray ct device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3299115A JPH05130984A (en) 1991-11-14 1991-11-14 X-ray ct device

Publications (1)

Publication Number Publication Date
JPH05130984A true JPH05130984A (en) 1993-05-28

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Country Link
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0655861A1 (en) * 1993-11-26 1995-05-31 Koninklijke Philips Electronics N.V. Image composition method and imaging apparatus for performing said method
KR20000007400A (en) * 1998-07-03 2000-02-07 윤종용 Image obtaining method of computer tomography system
JP2005034667A (en) * 2004-11-02 2005-02-10 Toshiba Corp X-ray ct device
US7260175B2 (en) 2004-03-09 2007-08-21 Ge Medical Systems Global Technology Company, Llc CT image producing method and X-ray CT apparatus
JP2007260398A (en) * 2006-03-29 2007-10-11 Siemens Ag Method for reducing stepwise artifact in computer tomographic displaying of heart and memory medium
WO2012099248A1 (en) * 2011-01-20 2012-07-26 株式会社東芝 Positron emission computed tomography device, method executed by positron emission computed tomography device, and program
CN114137001A (en) * 2021-11-15 2022-03-04 上海博恩登特科技有限公司 Oral impression imaging method based on oral CBCT system

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0655861A1 (en) * 1993-11-26 1995-05-31 Koninklijke Philips Electronics N.V. Image composition method and imaging apparatus for performing said method
KR20000007400A (en) * 1998-07-03 2000-02-07 윤종용 Image obtaining method of computer tomography system
US7260175B2 (en) 2004-03-09 2007-08-21 Ge Medical Systems Global Technology Company, Llc CT image producing method and X-ray CT apparatus
JP2005034667A (en) * 2004-11-02 2005-02-10 Toshiba Corp X-ray ct device
JP2007260398A (en) * 2006-03-29 2007-10-11 Siemens Ag Method for reducing stepwise artifact in computer tomographic displaying of heart and memory medium
US8892187B2 (en) 2006-03-29 2014-11-18 Siemens Aktiengesellschaft Method for reducing step artifacts in a cardio CT representation
JP2012150114A (en) * 2011-01-20 2012-08-09 Toshiba Corp Positron emission computer tomographic apparatus and method and program implemented by positron emission computer tomographic apparatus
CN102753993A (en) * 2011-01-20 2012-10-24 株式会社东芝 Positron emission computed tomography device, method executed by positron emission computed tomography device, and program
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