The effect of collimation on scatter fraction in multi-slice PET

Author

Thompson, C.J.

Author_Institution

Dept. of Neurology & Med. Phys. Unit, McGill Univ., Montreal, Que., Canada

Volume

35

Issue

1

fYear

1988

fDate

2/1/1988 12:00:00 AM

Firstpage

598

Lastpage

602

Abstract

The scatter fraction in a positron-emission tomograph (PET) depends on the collimator size and shape. Monte Carlo techniques were used to estimate the scatter fraction in multislice PET. Simulations of bismuth germanate detector arrays of 51 and 64 cm in diameter and a field of view 25 cm in diameter and 9.5 cm axially were done for a 20-cm-diameter phantom. Scatter fractions for one central, direct 1-cm-thick slice varied between 12% for a 15-slice geometry with 2-mm tungsten interslice septa to 43% for one slice with true 3-D collimation without septa. These values compare with an 8% scatter fraction with a 1-cm opening between lead collimators in a single-slice geometry. The scatter fraction in a transmission scan on a 20-cm source is higher than in an emission scan.

Keywords

Monte Carlo methods; computerised tomography; radioisotope scanning and imaging; 1 cm; 2 mm; 20 cm; 25 cm; 51 cm; 64 cm; 9.5 cm; BiGe₅O₁₂; Monte Carlo techniques; Pb; W; collimation; collimator size; multi-slice PET; positron-emission tomograph; scatter fraction; shape; Bismuth; Collimators; Detectors; Geometry; Imaging phantoms; Monte Carlo methods; Positron emission tomography; Scattering; Sensor arrays; Shape;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.12794

Filename

12794