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Computed tomography scanning apparatus and method for generating parallel projections using non-parallel slice data

  • US 5,881,122 A
  • Filed: 10/10/1997
  • Issued: 03/09/1999
  • Est. Priority Date: 04/09/1997
  • Status: Expired due to Term
First Claim
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1. A method of generating a two-dimensional projection image of an object in a region having a longitudinal axis, said method comprising:

  • scanning the region to generate scan data representative of the region, said scanning comprising;

    providing a radiation source and an array of detectors on opposed sides of the region,rotating at least the radiation source about the longitudinal axis while the radiation source emits radiation toward the array of detectors, andwith the array of detectors, receiving radiation from the region to generate the scan data for the region;

    defining a plurality of image data slices corresponding to a plurality of positions along the longitudinal axis of the region, successive image data slices being non-parallel with each other, each of said image data slices defining a plurality of scan data projections obtained from a respective plurality of view angles during the scanning step, each scan data projection containing scan data at its respective view angle;

    selecting a projection angle for the two-dimensional projection image of the region;

    for each of said image data slices, identifying the view angle that corresponds to the selected projection angle;

    for each of said image data slices, selecting the scan data projection that corresponds to the identified view angle; and

    generating the two-dimensional projection image of the region using the selected scan data projections.

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