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Abstract #2266

A Comparative Study of 3D Time of Flight MRA and Contrast-Enhanced MRA :Clinical and Phantom Studies

Yoko Saito1, Minoru Osanai2, Kazuhiko Oyu2, Keito Hamada2, Hiraku Yodono3

1Graduate School of Health Sciences, Hirosaki University , Hirosaki, Aomori, Japan; 2Graduate School of Health Sciences, Hirosaki University, Hirosaki, Aomori, Japan; 3Radiology, Narumi Hospital, Hirosaki, Aomori, Japan

We evaluated the stenotic degree of arteries at the skull base level which are demonstrated on both 3D-TOF MRA and CE-MRA in 139 cases (659 vessels ). The discrepancy between these two technique in grading steotic degree occurred in 80 arteries. The stenotic grading were more severely estimated with CE MRA than with TOF MRA.We also performed phantom study. TOF-MRA tended to demonstrate the phantom more accurately than CE-MRA. On TOF-MRA with 1.6mm slice thickness, diameters were most accurately demonstrated. In CE-MRA, diameters of the tube were significantly more accurate with parallel imaging than with ZIP.