Performance Study of Whole-Body, Multislice Positron Computed Tomograph POSITOLOGICA-II

Author

Takami, K. ; Ueda, K. ; Okajima, K. ; Tanaka, E. ; Nohara, N. ; Tomitani, T. ; Yamamoto, M. ; Murayama, H. ; Shishido, F. ; Ishimatsu, K. ; Ohgushi, A. ; Inoue, S. ; Takakusa, Y. ; Hayashi, T. ; Nakase, S.

Author_Institution

Hitachi Central Research Laboratory, Kokubunji, Tokyo

Volume

30

Issue

1

fYear

1983

Firstpage

734

Lastpage

738

Abstract

A 3-detector ring, 5-slice whole-body positron CT has been developed and is being tested. The PCT, POSITOLOGICA-II, has a total of 480 BGO´s (160/ring), and employs continuous rotation scan (0.5rps). By using a 15mm wide BGO, a 9.2mm FWHM spatial resolution for reconstructed image is obtained at the center of FOV. Measured phantom diameter dependence of the true count rate shows good agreement with theoretically anticipated characteristics, including maximum sensitivity at around 30cm dia. Sensitivities for 20cm dia. phantom are 28 and 38 kcps/Â¿Ci/ml for in-plane and cross-plane, respectively, including scattered coincidences. Relative system detection efficiency measured with a line source at FOV center is 96% at 15ns time window (90% at 12ns), basing on 100% efficiency in 20-24ns.

Keywords

Collimators; Detectors; Filters; Image reconstruction; Image resolution; Image sampling; Imaging phantoms; Positrons; Sampling methods; Spatial resolution;

fLanguage

English

Journal_Title

Nuclear Science, IEEE Transactions on

Publisher

ieee

ISSN

0018-9499

Type

jour

DOI

10.1109/TNS.1983.4332367

Filename

4332367