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Abstract #4429

Low Dose, Supraortic 3D Time-Resolved MR Angiography at 3T: Comparison with High Spatial Resolution 3D Contrast-Enhanced MR Angiography

Yoon-joo Lee1, Jae-young Byun1, So-lyung Jung1, Won-jong Yoo1, Young-joo Kim1, Kook-jin Ahn1, Bum-soo KIM1

1Department of Radiology, The Catholic University of Korea, Seoul, Korea, Republic of

This study evaluates feasibility and effectiveness of low-dose TR-CEMRA (with injection of 1cc of Gadobutrol followed by 20cc of saline) performed in the assessment of supraaortic vessel, acquired with combination of parallel imaging (GRAPA) and view-sharing technique (TWIST) at 3T. Retrospective evaluation of image quality and stenosis grade by two neuroradiologist was done, and compared with the results from high-resolution single-phase CEMRA. The overall image quality for low-dose TR-CEMRA was in diagnostic range, comparable to HR-CEMRA. In grading of stenosis, TR-CEMRA showed concordant results with HR-CEMRA in 90.8%, with relatively more number of overestimation than underestimation.