PET system calibration and attenuation correction

Author

Pawitan, Y. ; Kohlmyer, S. ; Lewellen, T. ; O´Sullivan, F.

Author_Institution

Dept. of Radiol., Washington Univ., Seattle, WA, USA

Volume

44

Issue

3

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1249

Lastpage

1253

Abstract

A statistical model involving machine calibration factors in PET is developed based on the analysis of the correlation structure of the blank scan data. These factors include the nonuniform detector efficiencies and the geometric effects. The crystal interference effect is shown to be the main feature of the correlation function. A likelihood based theory is developed and the maximum likelihood estimates of the factors are derived. In the application of the model, estimated machine effects are used to calibrate the transmission scan and a robust smoothing is then applied to get the attenuation correction factor. The proposed technique is illustrated with studies on the GE Advance PET Scanner

Keywords

biomedical equipment; calibration; correlation methods; gamma-ray absorption; gamma-ray detection; maximum likelihood estimation; positron emission tomography; smoothing methods; GE Advance PET Scanner; PET system calibration; attenuation correction; blank scan data; correlation structure; crystal interference effect; geometric effects; likelihood based theory; machine calibration factors; machine effects; maximum likelihood estimates; nonuniform detector efficiencies; robust smoothing; statistical model; torso phantom example; transmission scan; Attenuation; Calibration; Detectors; Educational institutions; Image reconstruction; Interference; Noise reduction; Positron emission tomography; Smoothing methods; Statistical analysis;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/23.596996

Filename

596996