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Titolo:
EFFECT OF LEAD FILTERS ON THE PERFORMANCE OF A NEURO-PET TOMOGRAPH OPERATED WITHOUT SEPTA
Autore:
SPINKS TJ; SHAH SI;
Indirizzi:
MRC,CYCLOTRON UNIT LONDON WC1E 6AS ENGLAND UNIV SURREY GUILDFORD GU2 5XH SURREY ENGLAND
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 4, volume: 40, anno: 1993,
parte:, 1
pagine: 1087 - 1091
SICI:
0018-9499(1993)40:4<1087:EOLFOT>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
RETRACTABLE SEPTA; SCANNER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
T.J. Spinks e S.I. Shah, "EFFECT OF LEAD FILTERS ON THE PERFORMANCE OF A NEURO-PET TOMOGRAPH OPERATED WITHOUT SEPTA", IEEE transactions on nuclear science, 40(4), 1993, pp. 1087-1091

Abstract

The value of using lead filters to improve the quality of PET data has been investigated for a CTI/Siemens 953B brain scanner operated without septa. The filters consisted of of thickness 0.5mm and 1.0mm and axial width 18cm which were placed around the outer surface of die patient port. The port diameter is 35 cm and the axial FOV 10.65cm. The ratios of dead times (with/without filter) with 1mCi (20cm uniform cylinder) in the FOV we 0.92 (0.5mm) and 0.82 (1mm) at a lower threshold (LLD) of 380keV; die values at 150keV are 0.87 and 0.76. Randoms rates are reduced by 12% (0.5mm) and 27% (1mm) at a LLD of 380KeV and by 20% and 40% at 150KeV. These values reflect the significant reduction of lower energy events observed in the measured energy spectrum. However, these reductions are accompanied by a drop in the true coincidence rate such that NEC is reduced for count rates up to dhe maximum measured trues rate at lower thresholds of 380 keV and 150 keV. It is concludedthat the filters used in this study provide no advantage in the performance of the tomograph.

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Documento generato il 09/08/20 alle ore 23:10:59