Title:
【発明の名称】X線コンピュータ断層撮影装置
Document Type and Number:
Japanese Patent JP2914891
Kind Code:
B2
Abstract:
An x-ray computed tomography system and method having a reconstruction processing circuit that interpolates projection data for an x-ray beam path from 2N detector elements in a detector array proximate to a point where the x-ray beam path intersects the detector array. The system and method can also extrapolate data from 2N detector elements when the x-ray path intersects the detector array in an uppermost or lowermost detector row. The system and method determines an overlap region between two x-ray beams and can perform backprojection in the overlap region based upon both of the overlapping beams. The system can also determine a border region in the overlap region and perform backprojection in the border region based upon the two overlapping beams and in the remainder of the overlap area based upon cone angles of the x-ray beams. The system can also cancel or attenuate image artifacts by varying the helical scanning pitch, and can apply position-dependent and/or angular-dependent weighting.
Inventors:
TAGUCHI KATSUYUKI
Application Number:
JP16996395A
Publication Date:
July 05, 1999
Filing Date:
July 05, 1995
Export Citation:
Assignee:
TOSHIBA KK
International Classes:
A61B6/03; G06T11/00; (IPC1-7): A61B6/03; A61B6/03
Domestic Patent References:
| JP4224736A |
Other References:
画像工学コンファレンス論文集、２１（１９９０）「円錐ビーム投影を用いた３次元ヘリカルスキャンＣＴ」ｐ．１６５−１６８
Attorney, Agent or Firm:
Takehiko Suzue