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Titolo:
USE OF X-RAY CT-DEFINED REGIONS OF INTEREST FOR THE DETERMINATION OF SPECT RECOVERY COEFFICIENTS
Autore:
TANG HR; BROWN JK; HASEGAWA BH;
Indirizzi:
UNIV CALIF SAN FRANCISCO,DEPT RADIOL SAN FRANCISCO CA 94143 UNIV CALIF SAN FRANCISCO,BIOENGN GRAD GRP SAN FRANCISCO CA 94143 UNIV CALIF BERKELEY BERKELEY CA 94720
Titolo Testata:
IEEE transactions on nuclear science
fascicolo: 4, volume: 44, anno: 1997,
parte:, 1
pagine: 1594 - 1599
SICI:
0018-9499(1997)44:4<1594:UOXCRO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
NOISE PROPERTIES; EM ALGORITHM; EMISSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
9
Recensione:
Indirizzi per estratti:
Citazione:
H.R. Tang et al., "USE OF X-RAY CT-DEFINED REGIONS OF INTEREST FOR THE DETERMINATION OF SPECT RECOVERY COEFFICIENTS", IEEE transactions on nuclear science, 44(4), 1997, pp. 1594-1599

Abstract

For accurate activity per unit volume measurements in SPECT, recoverycoefficients are usually applied based on the size and shape of objects being imaged to properly account for the resolution limitations of the gamma camera. Because of noise and limited spatial resolution, determination of object sizes and boundaries can be difficult using the SPECT images alone. We therefore have developed a technique which determines activity concentrations for SPECT using regions of interest (ROI's) obtained from coregistcred X-ray CT images. In this study, experimental phantoms containing cylindrical and spherical objects were imaged on a combined X-ray CT/SPECT system and reconstructed data volumes were registered using the known geometry of the system. ROI's were defined on the registered CT images and used to help quantify activity concentration in localized regions and to measure object volumes. We havederived the recovery curves for these objects and scan technique. We have alsb tested a technique that demonstrates activity quantitation without the need for object and size dependent recovery coefficients inthe case of low background.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 02:25:37