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Titolo:
SEMIAUTOMATED METHOD FOR NOISE-REDUCTION AND BACKGROUND PHASE ERROR CORRECTION IN MR PHASE-VELOCITY DATA
Autore:
WALKER PG; CRANNEY GB; SCHEIDEGGER MB; WASELESKI G; POHOST GM; YOGANATHAN AP;
Indirizzi:
GEORGIA INST TECHNOL,SCH CHEM ENGN,888 HEMPHILL AVE ATLANTA GA 30332
Titolo Testata:
Journal of magnetic resonance imaging
fascicolo: 3, volume: 3, anno: 1993,
pagine: 521 - 530
SICI:
1053-1807(1993)3:3<521:SMFNAB>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Keywords:
HEART, FLOW DYNAMICS; HEART, FUNCTION; HEART, MR; HEART, VENTRICLES; IMAGE DISPLAY; IMAGE PROCESSING; PHASE CORRECTION; PHASE IMAGING; VASCULAR STUDIES; VELOCITY STUDIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
NO
Recensione:
Indirizzi per estratti:
Citazione:
P.G. Walker et al., "SEMIAUTOMATED METHOD FOR NOISE-REDUCTION AND BACKGROUND PHASE ERROR CORRECTION IN MR PHASE-VELOCITY DATA", Journal of magnetic resonance imaging, 3(3), 1993, pp. 521-530

Abstract

Background phase distortion and random noise can adversely affect thequality of magnetic resonance (MR) phase velocity measurements. A semiautomated method has been developed that substantially reduces both effects. To remove the background phase distortion, the following stepswere taken: The time standard deviations of the phase velocity imagesover a cardiac cycle were calculated. Static regions were identified as those in which the standard deviation was low. A flat surface representing an approximation to the background distortion was fitted to the static regions and subtracted from the phase velocity images to givecorrected phase images. Random noise was removed by setting to zero those regions in which the standard deviation was high. The technique is demonstrated with a sample set of data in which the in-plane velocities have been measured in an imaging section showing the left ventricular outflow tract of a human left ventricle. The results are presentedin vector and contour form, superimposed on the conventional MR angiographic images.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/09/20 alle ore 16:23:37