X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1997-06-17
1999-03-30
Porta, David P.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378 19, 378901, A61B 603
Patent
active
058898336
ABSTRACT:
An x-ray computed tomography device and method where backprojection is performed with pixels each having their own back projection range. The range is determined using a two-dimensional completeness condition such that every line through a reconstructed slice must intercept the projection of the source orbit onto the plane of the slice. The completeness condition provides an adequate amount of data for the back projection to maintain quality of the reconstructed image while allowing a higher helical pitch ratio. This is advantageous in situations where fast scanning is desired, such as patient screening and CT-angiography. The method and device are preferably applied to a helical cone beam system. The backprojection can be performed using cone-beam projection data obtained with a helical scan or after sorting the projection data into parallel-beam ray-sums in the transverse plane while maintaining the cone angle. The sorting advantageously further increases the helical pitch ratio and thus increases scanning speed and reduces scanning time. The two types of backprojection may each use either the full projection data set or a minimal data set determined based upon the completeness condition.
REFERENCES:
patent: 5355309 (1994-10-01), Eberhard et al.
patent: 5430784 (1995-07-01), Ribner et al.
patent: 5625660 (1997-04-01), Tuy
Bruce David Vernon
Kabushiki Kaisha Toshiba
Porta David P.
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