Attenuation correction with low activity sources

Author

Wainer, N. ; Bouhnik, J.P. ; Wilk, M. ; Chouraqui, P.

Author_Institution

Elgems Res. & Dev., Israel

Volume

3

fYear

1998

fDate

1998

Firstpage

1813

Abstract

The aim of this study was to test the influence of the source decay on the performance of the attenuation-corrected (AC) thallium-201 ((²01)Tl) single photon emission tomography using a gadolinium-153 (¹⁵³Gd) line source. Three acquisitions were performed using the same line source during a period of 26 months. The activity of the source was 300 mCi for the first acquisition and 30 mCi for the last one. For each phantom acquisition AC and NC (non-corrected) ²⁰¹Tl SPECT was performed. AC and NC images were evaluated by a 31-segment semiquantitative analysis. Comparisons between the circumferential count density profiles of the AC and NC segmented polar map were done. Evident degradation in the AC performance was demonstrated for line source activity lower then 60 mCi. From noise propagation the authors estimated that source activity higher then 300 mCi would give poor improvement in the AC performance

Keywords

gamma-ray absorption; medical image processing; radioactive sources; single photon emission computed tomography; 0.03 Ci; 0.06 Ci; 0.3 Ci; 26 month; Gd; SPECT; Tl; attenuation correction; circumferential count density profiles; image artefacts; line source activity; low activity sources; noise propagation; nuclear medicine; phantom acquisition; Attenuation; Cameras; Collimators; Detectors; Image reconstruction; Image segmentation; Imaging phantoms; Magnetic heads; Myocardium; Single photon emission computed tomography;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium, 1998. Conference Record. 1998 IEEE

Conference_Location

Toronto, Ont.

ISSN

1082-3654

Print_ISBN

0-7803-5021-9

Type

conf

DOI

10.1109/NSSMIC.1998.773889

Filename

773889