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Titolo:
CALCULATION OF SINGLE DETECTOR EFFICIENCIES AND EXTENSION OF THE NORMALIZATION SINOGRAM IN PET
Autore:
HERMANSEN F; SPINKS TJ; CAMICI PG; LAMMERTSMA AA;
Indirizzi:
AARHUS GEN HOSP,44 NORREBROGADE DK-8000 AARHUS C DENMARK HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,MRC,CLIN SCI CTR,CYCLOTRON UNIT,PET METHODOL GRP LONDON W12 0HS ENGLAND HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,MRC,CLIN SCI CTR,CYCLOTRON UNIT,CARDIOL GRP LONDON W12 0HS ENGLAND
Titolo Testata:
Physics in medicine and biology
fascicolo: 6, volume: 42, anno: 1997,
pagine: 1143 - 1154
SICI:
0031-9155(1997)42:6<1143:COSDEA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
POSITRON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
7
Recensione:
Indirizzi per estratti:
Citazione:
F. Hermansen et al., "CALCULATION OF SINGLE DETECTOR EFFICIENCIES AND EXTENSION OF THE NORMALIZATION SINOGRAM IN PET", Physics in medicine and biology, 42(6), 1997, pp. 1143-1154

Abstract

A fast iterative method is presented for calculating single detector efficiencies for positron emission tomographs. These efficiencies can be used to extend the normalization scan to areas outside that coveredby the normalization source. The root mean square (rms) error of the calculated single detector efficiencies decreases exponentially with the number of iterations. Thirty iterations per normalization image aresufficient and take about 1 s on a SUN Classic. The geometry factors are composed of factors which only depend on the distance from the centre of the field-of-view (FOV) and of factors which show a more complex pattern over the normalization sinogram. The geometry factors are specific to each scanner. On the ECAT 931 scanner the complex part of the geometry factors showed a diamond shaped pattern (caused by the varying sensitivity of single detectors in a detector block with varying angle of incidence) and S-shaped curves (representing attenuation caused by supporting rods for the ring source). The coefficient of variation of the diamond-shaped pattern was 4% for detectors farthest from thecentre of the FOV. Extensions of the normalization scan may, therefore, contain a relative rms error of about 4% if the applied geometry factors only take the distance from the centre of the FOV into account.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/09/20 alle ore 19:00:50