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

S. H. Faro, S. Vinitski, H. V. Ortega, F. B. Mohamed, C. Y. Chen, A. E. Flanders, C. F. Gonzales, R. A. Zimmerman

Research output: Contribution to journalArticle

10 Citations (Scopus)

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°) 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-inchcoils. 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.

Original languageEnglish
Pages (from-to)403-408
Number of pages6
JournalNeuroradiology
Volume38
Issue number5
DOIs
Publication statusPublished - Jul 1996
Externally publishedYes

Keywords

  • Carotid arteries
  • Magnetic resonance angiography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Clinical Neurology
  • Radiological and Ultrasound Technology

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    Faro, S. H., Vinitski, S., Ortega, H. V., Mohamed, F. B., Chen, C. Y., Flanders, A. E., Gonzales, C. F., & Zimmerman, R. A. (1996). Carotid magnetic resonance angiography: Improved image quality with dual 3-inch surface coils. Neuroradiology, 38(5), 403-408. https://doi.org/10.1007/s002340050272