Reduction of hitlist size in spiral cone beam CT by use of local

Details Reduction of hitlist size in spiral cone beam CT by use of local Reduction of hitlist size in spiral cone beam CT by use of local

1997-09-30

1999-05-04

Bruce, David Vernon

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 15, 378901, A61B 603

Patent

active

059011963

ABSTRACT:
A method and apparatus for reconstructing an image of an object using a three dimensional (3D) computerized tomographic (CT) imager having a cone beam radiation source and detector arrangement for acquiring measurement data. The source and detector arrangement is operated at a plurality of source positions along a spiral scan path so as to acquire a corresponding plurality of sets of measurement data representative of radiation attenuation caused by the object. Image reconstruction processing information required for processing of the acquired measurement data in a Radon space partitioned by plurality of vertically oriented coaxial .phi.-planes for reconstructing the image, is pre-calculated and stored in a hitlist. The stored information is pre-calculated on less that all of the .phi.-planes, but due to a symmetry that is induced in the reconstruction processing, the stored information can be used for calculating Radon data for all of the .phi.-planes that partition the Radon space. The size of the hitlist is thus reduced by a factor equal to the number of .phi.-planes for which the stored information is re-used, e.g., 360 for 1/2 degree .phi.-plane spacing and storage of reconstruction processing information for a single .phi.-plane.

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