Method and apparatus for eliminating boundary errors in cone bea

Details Method and apparatus for eliminating boundary errors in cone bea Method and apparatus for eliminating boundary errors in cone bea

1996-12-20

1998-05-05

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378 15, 378901, A61B 603

Patent

active

057486972

ABSTRACT:
In accordance with the principles of the present invention, image reconstruction errors which occur when using an area detector having a plurality of rows of detector elements defining a height for the detector that is smaller than the cone beam image, can be avoided by correlating an amount of orthogonal translation applied to line segments L extending across the detector towards top and bottom edges thereof that are used for calculating Radon derivative data, with the spacing between adjacent rows of the detector elements that are at the top and bottom edges of the detector. In a preferred embodiment the detector comprises a plurality of M rows of detector elements centered between the top and bottom edges of the detector, and an additional N rows of detector elements adjacent the M rows, at both of the top and bottom edges of the detector (where N may equal 1).

REFERENCES:
patent: 5390111 (1995-02-01), Tam
patent: 5461650 (1995-10-01), Tam

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