Carotid magnetic resonance angiography: improved image quality with dual 3-inch surface coils.

Abstract:

:Magnetic resonance angiography (MRA) hs inherent artifacts due to variation in velocity and direction of flowing blood in the carotid bulb and regions of stenosis. We examined the efficiency of dual 3-inch surface coils to delineate carotid artery flow better. Carotid MRA was performed on ten healthy volunteers and six patients, on a 1.5 T system. A special adapter was constructed to use with 3-inch (receive-only) coils, which were placed over the carotid bifurcations. Routine anterior neck coils were also used. Contiguous axial two-dimensional (45/8.7, 1.5 mm, flip angle 60 degrees) time-of-flight sequences were used. Image matrix was 256 x 256 with two signals averaged and acquisition time 6-10 min. These images were postprocessed and reformatted into angiographic views using a maximum intensity projection algorithm. Computer simulation of carotid artery blood flow throughout the cardiac cycle based on vessel contours derived from digital subtraction angiography was carried out by finite element analysis. Improved definition of vessel margin, particularly at the carotid bifurcation, and substantially increased signal-to-background ratio of flowing blood were obtained with 3-in-chcoils. Apparent loss of signal in the carotid bulb was diminished. In one patient, contiguous flow throughout a high-grade stenosis was well defined, with the surface coil method, while drop-off of signal was observed with routine neck coil imaging.

journal_name

Neuroradiology

journal_title

Neuroradiology

authors

Faro SH,Vinitski S,Ortega HV,Mohamed FB,Chen CY,Flanders AE,Gonzales CF,Zimmerman RA

doi

10.1007/BF00607262

subject

Has Abstract

pub_date

1996-07-01 00:00:00

pages

403-8

issue

5

eissn

0028-3940

issn

1432-1920

journal_volume

38

pub_type

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