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Titolo:
INVESTIGATION OF NOISE EQUIVALENT COUNT RATE IN POSITRON IMAGING USING A DUAL HEAD GAMMA-CAMERA
Autore:
BRASSE D; TARARINE M; LAMER O; BENDRIEM B;
Indirizzi:
CEA,SERV HOSP FREDERIC JOLIOT F-91401 ORSAY FRANCE SOPHA MED VIS BUC FRANCE
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 3, volume: 45, anno: 1998,
pagine: 438 - 442
SICI:
0018-9499(1998)45:3<438:IONECR>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERFORMANCE-CHARACTERISTICS; PET SCANNER; SENSITIVITY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
D. Brasse et al., "INVESTIGATION OF NOISE EQUIVALENT COUNT RATE IN POSITRON IMAGING USING A DUAL HEAD GAMMA-CAMERA", IEEE transactions on nuclear science, 45(3), 1998, pp. 438-442

Abstract

In positron imaging, image quality depends on scatter, random and coincidence rate. It is known that Noise Equivalent Count (NEC) rate is agood indicator of image quality and that it helps optimizing acquisition parameters. We measured the NEC curve with a SophyCamera DST (SMV)using a 20 cm cylinder phantom filled with F-18 (59 MBq). The field of view of the DST is determined by two rectangular parallel detectors (400300 mm) separated by 720 mm and each scintillation detector is composed of a 3/8 of an inch thick NaI(TI) crystal. The coincidence limewindow was set to 15 ns and the scatter fraction (sf) was measured using a PET NEMA protocol. We measured random and coincident count ratesusing tomographic acquisition with two 20% energy windows centered on511 KeV (photopeak) and 417 KeV (Compton) over 6 half-lives of F-18. We investigated random coincidence rate by delaying signals from one of the coincident detectors (45 ns) and measured system sensitivity as the slope at the origin of the NEC curve. The NEC rate peaked at 199 cps for photopeak (with a 0.20 sf) and at 252 cps for photopeak + Compton (with 0.28 sf) coincidences. These maxima were attained over activity concentration values ranging from 1.33 kBq/cc to 1.85 kBq/cc. Our results show that image quality improves when using photopeak + Comptoncoincidences with a 30% greater sensitivity and an increased NEG rate.

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Documento generato il 07/08/20 alle ore 20:53:27