Performance evaluation of a transmission reconstruction algorithm with simultaneous transmission-emission SPECT system in a presence of data truncation

Author

Maniawski, PJ ; Morgan, HT ; Gullberg, GT ; Zeng, GL ; Welch, AE ; Tung, CH

Author_Institution

Picker Int., Bedford Heights, OH, USA

Volume

4

fYear

1994

fDate

30 Oct-5 Nov 1994

Firstpage

1578

Abstract

A simultaneous transmission-emission SPECT system (STEP) was developed on a three-detector gamma camera (Picker Prism 3000) equipped with fan-beam collimators (65 cm focal length) and a transmission line source. With this system, fan-beam geometry can cause transmission projection data to be truncated. An iterative transmission reconstruction algorithm was formulated to determine the distribution of attenuation coefficients from the system of linear equations for only measured projections. In this paper we evaluated this algorithm using phantom data with varying degree of data truncation. The results showed that with up to 30% truncation, differences in partial attenuation integrals in the non-truncated region were statistically not significant (p<0.05). Also, a study was performed to determine the minimal number of iterations necessary to obtain quantitatively accurate results. It was shown that partial attenuation integrals were not significantly different (p<0.05) when 9 to 100 iterations were performed. We conclude that the described transmission reconstruction algorithm using nine iterations is quantitatively accurate and is able to correct for the truncation of the data

Keywords

biomedical equipment; cardiology; image reconstruction; iterative methods; medical image processing; single photon emission computed tomography; 65 cm; Picker Prism 3000; STEP; attenuation coefficients; data truncation; fan-beam collimators; fan-beam geometry; iterations; iterative transmission reconstruction algorithm; linear equations; measured projections; nontruncated region; partial attenuation integrals; performance evaluation; phantom data; simultaneous transmission-emission SPECT system; three-detector gamma camera; transmission line source; transmission projection data; transmission reconstruction algorithm; Attenuation measurement; Calibration; Cameras; Collimators; Crosstalk; Detectors; Image processing; Image quality; Image reconstruction; Reconstruction algorithms;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium and Medical Imaging Conference, 1994., 1994 IEEE Conference Record

Conference_Location

Norfolk, VA

Print_ISBN

0-7803-2544-3

Type

conf

DOI

10.1109/NSSMIC.1994.474761

Filename

474761