X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1986-03-14
1988-06-28
Howell, Janice A.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 4, 378 10, A61B 600
Patent
active
047544686
ABSTRACT:
An X-ray CT system includes an X-ray source, a drive device, an X-ray detector, a data acquisition system, a reconstruction processor and a delay circuit. The X-ray source emits an X-ray fan beam onto an object and is rotated by the drive device on substantially the same plane as the fan beam. A graticule sensor detects an angular position of the X-ray source. The X-ray detector consists of detector elements fixed concentrically with a relative rotational path of the X-ray source. The data acquisition system responds to a position signal from the graticule sensor and samples the output data from the detector for each predetermined angular position of the X-ray source to obtain projection data. The projection data is reconstructed by the reconstruction processor to obtain a tomographic image of the object. The delay circuit delays the position signal from the graticule sensor to offset the sampling point of the projection data by a 1/4 sampling point pitch from the angle corresponding to the center of each detection element.
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Howell Janice A.
Kabushiki Kaisha Toshiba
Porta David P.
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