Analytical compensation for spatially variant detector response in SPECT with varying focal-length fan-beam collimators

Author

Li, Tianfang ; Wen, Junhai ; Liang, Zhengrong

Author_Institution

Depts. of Phys. & Astron. & Radiol., State Univ. of New York, Stony Brook, NY, USA

Volume

50

Issue

3

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

398

Lastpage

404

Abstract

The authors present a new method to compensate for the spatially variant detector response in single photon emission computed tomography (SPECT) with varying focal-length fan-beam (VFF) geometry. In this method, the deblurred projection is explicitly expressed as an integral of the collimator blurred data and the fully calibrated system kernel matrix with certain transforms. It needs a little more computation time than the conventional filtering techniques but provides much more accurate compensation. This method also represents a unified framework for detector response compensation in parallel-hole fan-beam and VFF SPECT with a circular scan orbit.

Keywords

single photon emission computed tomography; SPECT; analytical compensation; calibrated system kernel matrix; circular scan orbit; deblurred projection; detector response compensation; filtering techniques; single photon emission computed tomography; spatially variant detector response; unified framework; varying focal-length fan-beam collimators; Computational geometry; Detectors; Face detection; Filtering; Kernel; Matrix decomposition; Optical collimators; Radiology; Reconstruction algorithms; Single photon emission computed tomography;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.2003.812440

Filename

1208602