Document Detail


Mechanisms of flow-induced signal loss in MR angiography.
MedLine Citation:
PMID:  1633399     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Mechanisms of signal loss in magnetic resonance angiography were studied with a stenotic flow phantom. The results indicate that while signal loss induced by mean fluid motions is localized about the stenosis, the fluctuating component of fluid motion induces signal loss over a much larger region, primarily distal to the stenosis. For both motion components, use of gradient moment nulling (GMN) above first order was found to be an ineffective means of reducing signal loss. In contrast, shortened gradient durations were found to reduce signal loss substantially. However, though a zeroth-order gradient is generally of the shortest duration, use of a slightly longer, first-order gradient was found to be the most robust means of reducing signal loss.
Authors:
S N Urchuk; D B Plewes
Related Documents :
9463689 - First-order motion from contrast modulated noise?
20055539 - Spatiotemporally coherent motion direction perception occurs even for spatiotemporal re...
9640589 - The effect of age, retinal eccentricity, and speed on the detection of optic flow compo...
9509159 - Local and global representations of velocity: transparency, opponency, and global direc...
14654459 - Training-induced recovery of visual motion perception after extrastriate cortical damag...
16799069 - Vernier acuity is normal in migraine, whereas global form and global motion perception ...
18752799 - Effect of arm swing direction on forward and backward jump performance.
12232329 - Identification of peroxisome membrane proteins (pmps) in sunflower (helianthus annuus l...
10200379 - Time-domain analysis of foot-ground reaction forces in negotiating obstacles.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of magnetic resonance imaging : JMRI     Volume:  2     ISSN:  1053-1807     ISO Abbreviation:  J Magn Reson Imaging     Publication Date:    1992 Jul-Aug
Date Detail:
Created Date:  1992-08-27     Completed Date:  1992-08-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9105850     Medline TA:  J Magn Reson Imaging     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  453-62     Citation Subset:  IM    
Affiliation:
Sunnybrook Health Science Centre, Department of Medical Biophysics, University of Toronto, Ont., Canada.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Blood Flow Velocity
Blood Vessels / anatomy & histology*
Constriction, Pathologic / diagnosis
Humans
Magnetic Resonance Imaging / methods*
Models, Cardiovascular
Models, Structural
Vascular Diseases / diagnosis

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Comparison of velocity-encoded MR imaging and fluid dynamic modeling of steady and disturbed flow.
Next Document:  Diagnosis of fatty liver with MR imaging.