Adjusting the low energy threshold for large bodies in PET

Author

Turkington, T.G. ; Wilson, J.W. ; Colsher, J.G. ; Colsher, J.G.

Author_Institution

Dept. of Radiol., Duke Univ., Durham, NC

Volume

5

fYear

2004

fDate

16-22 Oct. 2004

Firstpage

2872

Lastpage

2876

Abstract

The performance of a PET scanner on three different phantom sizes was studied as a function of low energy threshold (LET). Phantom cross sections ranged from 20 cm diameter circular to 28 cmtimes43 cm oval and LET´s ranged from 350 keV to 475 keV, in 25 keV increments. System sensitivity, scatter fraction, and NEC were measured over a wide range of radioactivity levels. Increasing the low energy threshold lowered both sensitivity and scatter fraction. The statistical quality of the raw data was maximized for the 425 keV setting for all three phantoms. System stability and uniformity of response was also studied for 375 keV to 450 keV thresholds, and indicated acceptable performance for this system through 425 keV

Keywords

image scanners; phantoms; positron emission tomography; 20 to 43 cm; 350 to 475 keV; PET scanner; low energy threshold; phantom cross sections; phantom sizes; scatter fraction; system sensitivity; Detectors; Electromagnetic scattering; Energy resolution; Imaging phantoms; Medical services; National electric code; Particle scattering; Positron emission tomography; Radiology; Telephony;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2004 IEEE

Conference_Location

Rome

ISSN

1082-3654

Print_ISBN

0-7803-8700-7

Electronic_ISBN

1082-3654

Type

conf

DOI

10.1109/NSSMIC.2004.1466286

Filename

1466286