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Titolo:
Dose reduction in spiral CT: Detection of pulmonary nodules with and without anatomic adaptation of tube current.
Autore:
Greess, H; Baum, U; Wolf, H; Lell, M; Nomayr, A; Schmidt, B; Kalender, WA; Bautz, W;
Indirizzi:
Univ Erlangen Nurnberg, Inst Diagnost Radiol, D-91054 Erlangen, Germany Univ Erlangen Nurnberg Erlangen Germany D-91054 -91054 Erlangen, Germany Univ Erlangen Nurnberg, Inst Med Phys, Erlangen, Germany Univ Erlangen Nurnberg Erlangen Germany nst Med Phys, Erlangen, Germany
Titolo Testata:
ROFO-FORTSCHRITTE AUF DEM GEBIET DER RONTGENSTRAHLEN UND DER BILDGEBENDEN VERFAHREN
fascicolo: 5, volume: 173, anno: 2001,
pagine: 466 - 470
SICI:
1438-9029(200105)173:5<466:DRISCD>2.0.ZU;2-L
Fonte:
ISI
Lingua:
GER
Soggetto:
COMPUTED-TOMOGRAPHY; CURRENT MODULATION;
Keywords:
dose reduction; spiral CT; intrapulmonary nodule;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Greess, H Univ Erlangen Nurnberg, Inst Diagnost Radiol, Maximilianspl 1, D-91054 Erlangen, Germany Univ Erlangen Nurnberg Maximilianspl 1 Erlangen Germany D-91054
Citazione:
H. Greess et al., "Dose reduction in spiral CT: Detection of pulmonary nodules with and without anatomic adaptation of tube current.", ROFO-F RONT, 173(5), 2001, pp. 466-470

Abstract

Purpose: To investigate the potential of projection angle-dependent anatomical adaptation of tube current to reduce dose in spiral CT examinations ofthe thorax without loss in detectability of pulmonary nodules and image quality. Patients and Methods: Dose can be reduced for non-circular patient cross-sections without an increase in noise if the tube current is reduced at those angular positions where the patient diameter and, consequently, attenuation are small. The examinations were dose with a SOMATOM Plus 4 (Siemens AG). CT projection data were analysed to determine the optimum tube current for each projection angle in real time. We compared image quality, done. and detection rates of pulmonary nodules for thoracic spiral CT examinations with and without online anatomically adapted tube current control in a group of 38 patients. Three radiologists counted all intrapulmonary nodulesin consensus separated in three different groups (< 5mm, 5-10 mm, > 10 mm). Image quality was evaluated in a scale from 1-3 (1=very good, 2=good, 3=worse). Results: On average, the dose was reduced by 21% (15-34%). With a constant tube current, 704 pulmonary nodules were detected, with tube currentmodulation 707 pulmonary modules. For three patients we saw more pulmonarynodules (five) with tube current modulation, for two patients we saw less pulmonary nodules (two). In a direct comparison, the missed intrapulmonary nodules were also detected in the respective method. Thus, the detection rate of intrapulmonary nodules was uninfluenced. In general, no deteriorationof image quality was observed. Conclusion: On average, 21% dose reduction was achieved by an anatomically adapted tube current modulation in spiral CT examinations of the thorax without a loss in detectability of pulmonary nodules and image quality. This method is an important contribution to dose reduction in spiral CT.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 15:20:38