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Titolo:
The influence of attenuation and scatter compensation on the apparent distribution of Tc-99m sestamibi in cardiac slices
Autore:
Pretorius, PH; Narayanan, MV; Dahlberg, ST; Leppo, JA; King, MA;
Indirizzi:
Univ Massachusetts, Sch Med, Div Nucl Med, Dept Radiol, Worcester, MA 01655 USA Univ Massachusetts Worcester MA USA 01655 Radiol, Worcester, MA 01655 USA
Titolo Testata:
JOURNAL OF NUCLEAR CARDIOLOGY
fascicolo: 3, volume: 8, anno: 2001,
pagine: 356 - 364
SICI:
1071-3581(200105/06)8:3<356:TIOAAS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORONARY-ARTERY DISEASE; EMISSION COMPUTED-TOMOGRAPHY; TL-201 MYOCARDIAL PERFUSION; SIMULTANEOUS TRANSMISSION; DIAGNOSTIC-ACCURACY; SPECT; ARTIFACTS; IMPACT; MOTION; LIVER;
Keywords:
attenuation compensation; scatter compensation; myocardial single photon emission computed tomography quantification;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Pretorius, PH Univ Massachusetts, Sch Med, Div Nucl Med, Dept Radiol, 55 Lake Ave N, Worcester, MA 01655 USA Univ Massachusetts 55 Lake Ave N Worcester MA USA 01655 USA
Citazione:
P.H. Pretorius et al., "The influence of attenuation and scatter compensation on the apparent distribution of Tc-99m sestamibi in cardiac slices", J NUCL CARD, 8(3), 2001, pp. 356-364

Abstract

Background. Our objective was to study the differences in relative count distributions in the left ventricular walls with attenuation compensation (AC) versus AC and triple-energy-window scatter compensation (SC), compared with standard filtered backprojection (FBP),Methods ann Results, Two hundred patients identified as having normal cardiac perfusion with FBP after undergoing either pharmacologically or physiologically induced stress were included in this study Projection data were reconstructed with FBP, 10 iterations of ordered-subset expectation-maximization (OSEM) with AC, and OSEM with AC+SC, A comparison was made of average percentage of maximum counts within each of 9 regions of CEqual (Marconi Medical Systems, Inc, Cleveland, Ohio) polar maps tie, the apex, 3 midventricular regions, and 4 basal regions), Compared with OSEM(AC), a slight decrease at the apex exists when SC is included, The elevated inferior-to-anteriorcount ratio in the midventricular and basal regions noted with OSEM(AC) decreased to close to 1.0 with OSEM(AC+SC). The anterior-to-lateral ratio forboth regions was closest to 1.0 for OSEM(AC+SC), In the midventricular region, the lateral-to-septal ratio decreased further below 1.0 with OSEM(AC+SC) than it did with OSEM(AC). This was the only basal ratio not to improve to close to 1.0 with OSEM(AC+SC). In a subset of patients identified at thetime of clinical reading as having a possible attenuation-caused decrease in the inferior region, AC elevated the inferior-to-anterior ratio to above1.0 for the midventricular region. AC+SC resulted in a ratio of near 1.0 for this region. In another subset of patients identified as having anteriorattenuation artifacts, compensation methods (either AC or AC+SC) failed toshow an improvement compared with FBP. Conclusions. AC and SC improve the uniformity of the polar map, especiallyby bringing the inferior-to-anterior ratio closer to 1,0, Further investigation is necessary to determine the cause of the increased midventricular septal polar map count. In addition, the subset of patients identified as having breast-like attenuation artifacts causing a decreased polar map count in the anterior mall (relative to the inferior wall) also needs further attention.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/06/19 alle ore 17:52:39