An elliptical orbit backprojection filtering algorithm for SPECT

Author

Gullberg, Grant T. ; Zeng, Gengsheng L.

Author_Institution

Dept. of Radiol., Utah Univ., Salt Lake City, UT, USA

Volume

40

Issue

4

fYear

1993

fDate

8/1/1993 12:00:00 AM

Firstpage

1102

Lastpage

1106

Abstract

An orbit geometry where the central projection ray of the detector is not constrained to pass through the center-of-rotation for all projection angles can be useful to reduce uniformity artifacts and to avoid truncation when imaging noncentrally located organs. A backprojection filtering algorithm is presented for parallel geometry with an elliptical orbit acquisition. The algorithm is verified by computer simulations. It is shown that the point response function is shift invariant and has an analytical expression which is not the common 1/r but is a function of the orbit geometry

Keywords

computerised tomography; data acquisition; medical image processing; patient diagnosis; radioisotope scanning and imaging; SPECT; center-of-rotation; central projection ray; elliptical orbit acquisition; elliptical orbit backprojection filtering algorithm; noncentrally located organs; orbit geometry; point response function; projection angles; truncation; uniformity artifacts; Cameras; Computer simulation; Face detection; Filtering algorithms; Gamma ray detection; Gamma ray detectors; Geometry; Image reconstruction; Optical collimators; Tomography;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.256719

Filename

256719