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Computed tomography method and apparatus for a dynamic image of a moving site

外国特許コード F100002286
整理番号 226US
掲載日 2010年11月29日
出願国 アメリカ合衆国
出願番号 91852105
公報番号 20090067570
公報番号 7711080
出願日 平成17年10月19日(2005.10.19)
公報発行日 平成21年3月12日(2009.3.12)
公報発行日 平成22年5月4日(2010.5.4)
国際出願番号 JP2005019174
国際公開番号 WO2006114908
国際出願日 平成17年10月19日(2005.10.19)
国際公開日 平成18年11月2日(2006.11.2)
優先権データ
  • 特願2005-127123 (2005.4.25) JP
  • 2005WO-JP19174 (2005.10.19) WO
発明の名称 (英語) Computed tomography method and apparatus for a dynamic image of a moving site
発明の概要(英語) (US7711080)
When a repeatedly periodically moving site of a to-be-examined subject in a gantry is subjected to computed tomography and is reconstructed, the gantry is rotated in synchronization with the movement of the periodically moving site, and a dynamic image showing a transient phenomenon is obtained in which the periodic movement of the moving site has been stopped.
As a result, the flow of a contrast agent or the like can be observed in a state of stopping the movement of an internal organ that moves repeatedly periodically.
特許請求の範囲(英語) [claim1]
1. A computed tomography method for obtaining an image of a periodically moving site of a to-be-examined subject in a gantry of a computed tomography machine so as to form a reconstructed dynamic image, comprising steps of: rotating the gantry with a frequency substantially equal to a frequency of the periodically moving site, and
obtaining the dynamic image that shows a transient phenomenon, wherein the dynamic image is obtained for points in time when the periodic movement of the moving site is at rest.
[claim2]
2. The computed tomography method for a moving site according to claim 1, wherein the computed tomography is performed with a 256-row CT.
[claim3]
3. The computed tomography method for a moving site according to claim 1, wherein, when the periodic movement is disturbed, a corresponding image is discarded.
[claim4]
4. The computed tomography method for a moving site according to claim 1, wherein the periodically moving site is a heart or lungs.
[claim5]
5. A computed tomography apparatus for obtaining an image of a periodically moving site of a to-be-examined subject in a gantry of the computed tomography apparatus so as to form a reconstructed dynamic image, the computed tomography apparatus comprising: means for detecting a periodic movement of the moving site;
means for controlling the rotational speed of the gantry to have a frequency substantially equal to a frequency of the periodic movement of the moving site; and
means for reconstructing resulting images and obtaining the dynamic image showing a transient phenomenon, wherein the resulting images are captured for points in time when the periodic movement of the moving site is at rest.
[claim6]
6. The computed tomography apparatus for a moving site according to claim 5, wherein the means for detecting the periodic movement of the moving site includes a heartbeat measuring means and a heartbeat interval calculating section that calculates heartbeat intervals in accordance with an output emitted from the heartbeat measuring means.
[claim7]
7. The computed tomography apparatus for a moving site according to claim 6, wherein the heartbeat interval calculating section is made up of an interval storing section and a forecasting section so as to always store heartbeat intervals going back to a consecutive predetermined number in the past in the interval storing section, and, when a change appears while allowing the forecasting section to refer to data stored therein, the forecasting section analyzes its tendency and forecasts a change in the next heartbeat interval.
[claim8]
8. The computed tomography apparatus for a moving site according to claim 5, wherein the means for controlling the rotational speed of the gantry includes: a CT control section that controls the gantry in accordance with an output emitted from the means for detecting the periodic movement of the moving site and an output emitted from a gantry position detecting means for detecting a rotational position of the gantry; and
a rotation means control section that rotates the gantry in accordance with an output emitted from the CT control section.
[claim9]
9. The computed tomography apparatus for a moving site according to claim 5, wherein the gantry is directly driven by a motor.
  • 発明者/出願人(英語)
  • MORI SHINICHIROU
  • ENDO MASAHIRO
  • NATIONAL INSTITUTES FOR QUANTUM AND RADIOLOGICAL SCIENCE AND TECHNOLOGY
国際特許分類(IPC)
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