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Titolo:
EXPERIENCE WITH FULLY 3D PET AND IMPLICATIONS FOR FUTURE HIGH-RESOLUTION 3D TOMOGRAPHS
Autore:
BAILEY DL; MILLER MP; SPINKS TJ; BLOOMFIELD PM; LIVIERATOS L; YOUNG HE; JONES T;
Indirizzi:
HAMMERSMITH HOSP,MRC,CYCLOTRON UNIT,DUCANE RD LONDON W12 0NN ENGLAND
Titolo Testata:
Physics in medicine and biology
fascicolo: 4, volume: 43, anno: 1998,
pagine: 777 - 786
SICI:
0031-9155(1998)43:4<777:EWF3PA>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSMISSION MEASUREMENTS; ATTENUATION CORRECTION; EMISSION; CS-137;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
D.L. Bailey et al., "EXPERIENCE WITH FULLY 3D PET AND IMPLICATIONS FOR FUTURE HIGH-RESOLUTION 3D TOMOGRAPHS", Physics in medicine and biology, 43(4), 1998, pp. 777-786

Abstract

The aim of this paper is to report on experience with 3D positron emission tomography (PET) in our institute where we have three 3D scanners, of which two operate exclusively in 3D mode (ECAT ART, EXACT 3D). Fully 3D PET requires attention to a number of factors which are not asproblematic in 2D PET. Firstly, 3D tomographs designed for whole-bodyacquisition suffer from a large single-photon field of view, extending well beyond the coincidence field of view. Single photons from outside the coincidence field of view increase the dead time and random coincidence rates, and contribute scattered events. For brain studies, wehave extended the lead side shielding at the ends of the tomograph tomitigate against these effects, and this has dramatically improved the count rate performance. This approach is not as effective for whole-body scanning. In addition, operating in 3D without septa necessitatesnew approaches to transmission scanning, as measurements using positron emitters such as Ge-68/Ga-68 have the unfavourable characteristics of high dead time and high scatter. Both of our fully 3D scanners use Cs-137 for single-photon transmission measurements, although the data are treated differently. On the ECAT ART, a combination of physical and electronic collimation effectively reduces transmission scatter to acceptable levels. On the EXACT 3D physical collimation is not as readily implemented and therefore segmentation and reassignment of the histogrammed attenuation (mu) values is employed to produce unbiased attenuation correction factors in 3D. Many of the lessons learnt with theseEGO (bismuth germanate) based tomographs will be applicable to the next generation of systems using faster detectors such as lutetium oxyorthosilicate (LSO).

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Documento generato il 29/11/20 alle ore 15:16:47