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Abstract #3349

Noncontrast MRA at 3T

Mitsue Miyazaki1,2, Yuichi Yamashita2, Andrew Wheaton1, Wayne Dannels1, Robert Anderson1, Leping Zha1, Satoshi Sugiura2

1Toshiba Medical Research Institute USA, Vernon Hills, IL, United States; 2Toshiba Medical Systems, Otawara, Tochigi, Japan

Despite the recent advancements in 3T, non-contrast MRA faces many problems such as a specific absorption rate (SAR) and B1 inhomogeneity. The B1 wavelength effect caused by conventional quadrature RF transmission makes shading or nonuniform signal intensity unavoidable, especially in abdominal and peripheral MRA. In this study, we have adjusted the pulse sequences to lower SAR and addressed the signal shading issue by applying multi-phase RF transmission.