Scatter suppression by using a rotating pin source in PET transmission measurements

Author

Kübler, W.K. ; Ostertag, H. ; Hoverath, H. ; Doll, J. ; Ziegler, S. ; Lorenz, W.J.

Author_Institution

German Cancer Res. Center, Inst. of Nucl. Med., Heidelberg, West Germany

Volume

35

Issue

1

fYear

1988

Firstpage

749

Lastpage

752

Abstract

Transmission scans used essentially for attenuation correction in whole-body studies with positron-emission tomography (PET) contain different amounts of scatter contamination, depending on the source used. It is shown by phantom studies that scatter causes spatial distortions and nonuniformities in the attenuation images, leading to errors in the attenuation correction factors. For these measurements a ring-shaped transmission source is simulated by a 6-cm-long rotating pin source containing 5 mCi of /sup 68/Ge. The measurements are performed using large phantoms filled with water. Scattered radiation is substantially suppressed by selecting only chords through the actual position of the source instead of collecting all coincident events. Improved edge delineation and homogeneity of the attenuation images are achieved.<>

Keywords

computerised tomography; radioisotope scanning and imaging; /sup 68/Ge; 5*10/sup -3/ Ci; PET transmission measurements; attenuation correction; attenuation images; edge delineation; homogeneity; nonuniformities; ring-shaped transmission source; rotating pin source; scatter contamination; spatial distortions; whole-body studies; Attenuation; Contamination; Distortion measurement; Error correction; Imaging phantoms; Pollution measurement; Positron emission tomography; Rotation measurement; Scattering; Whole-body PET;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.12825

Filename

12825