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Titolo:
Autocorrection of three-dimensional time-of-flight MR angiography of the circle of Willis
Autore:
McGee, KP; Felmlee, JP; Jack, CR; Manduca, A; Riederer, SJ; Ehman, RL;
Indirizzi:
Mayo Clin, Dept Diagnost Radiol, MRI Res Lab, Rochester, MN 55905 USA MayoClin Rochester MN USA 55905 ol, MRI Res Lab, Rochester, MN 55905 USA
Titolo Testata:
AMERICAN JOURNAL OF ROENTGENOLOGY
fascicolo: 2, volume: 176, anno: 2001,
pagine: 513 - 518
SICI:
0361-803X(200102)176:2<513:AOTTMA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADAPTIVE MOTION CORRECTION; ARTIFACTS; IMAGES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: McGee, KP Mayo Clin, Dept Diagnost Radiol, MRI Res Lab, 200 1st St SW, Rochester, MN55905 USA Mayo Clin 200 1st St SW Rochester MN USA 55905 ster, MN55905 USA
Citazione:
K.P. McGee et al., "Autocorrection of three-dimensional time-of-flight MR angiography of the circle of Willis", AM J ROENTG, 176(2), 2001, pp. 513-518

Abstract

OBJECTIVE. The purpose of this study was to investigate the efficacy of a retrospective adaptive motion correction technique known as autocorrection for reducing motion-induced artifacts in high-resolution three-dimensional time-of-flight MR angiography of the circle of Willis. MATERIALS AND METHODS. Ten consecutive volunteers were imaged with an un enhanced gradient-recalled echo three-dimensional time-of-flight MR angiography sequence of the circle of Willis. Each volunteer was asked to rotate approximately 2 degrees after completion of one third and one half of the acquisition in the axial, sagittal, and oblique planes (45 degrees to the axial and sagittal planes). A single static data set was also acquired for eachvolunteer. Unprocessed and autocorrected maximum-intensity-projection images were reviewed as blinded image pairs by six radiologists and were compared on a five-point image quality scale. RESULTS. Mean improvement in image quality after autocorrection was 1.4 (p< 0.0001), 1.1 (p < 0.0001), and 0.2(p = 0.003) observer points (maximum value, 2.0), respectively, for examinations corrupted by motion in the axial, oblique, and sagittal planes. All three axes had statistically significant improvement in image quality compared with the uncorrected images. Changes in image quality after the application of the autocorrection algorithm tostatic angiogram data were not statistically significant (mean change in score = -0.13 points: p = 0.29). CONCLUSION. Autocorrection can reduce artifacts in motion-corrupted MR angiography of the circle of Willis without distorting motion-free examinations.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/20 alle ore 15:18:54