Compensation for nonstationary detector response in analytical varying focal-length fan-beam SPECT reconstruction

Author

Li, Tianfang ; Wen, Junhai ; Liang, Zhengrong

Author_Institution

Dept. of Phys. & Astron., State Univ. of New York, USA

Volume

3

fYear

2002

fDate

10-16 Nov. 2002

Firstpage

1686

Abstract

In this study, a nonstationary filtering technique was developed to compensate for spatially variant detector response in varying focal-length fan-beam (VFF) collimated SPECT. First a collimator coordinate system was introduced in order to derive the geometric transfer function and the frequency-distance relation for the VFF collimator from its parallel-beam and fan-beam counterparts, and then the Fourier transform of the detector response was computed and used to construct a Wiener filter. The filter was applied to the blurred projection data before image reconstruction. Experimental results demonstrated improved resolution in reconstructed images after nonstationary filtering.

Keywords

Fourier transforms; Wiener filters; single photon emission computed tomography; Fourier transform; Wiener filter; detector response; frequency-distance relation; geometric transfer function; nonstationary filtering; parallel-beam; varying focal-length fan-beam SPECT; Collimators; Concurrent computing; Detectors; Filtering; Fourier transforms; Frequency; Image reconstruction; Image resolution; Transfer functions; Wiener filter;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2002 IEEE

Print_ISBN

0-7803-7636-6

Type

conf

DOI

10.1109/NSSMIC.2002.1239648

Filename

1239648