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Abstract #0810

Quantitative Study of TX/RX-efficiency of X-Nuclear MRS/MRI at High/Ultrahigh Field

Hannes M. Wiesner 1 , Wei Luo 2 , Qing X. Yang 3 , Xiao-Hong Zhu 1 , Scott Schillak 1 , and Wei Chen 1

1 Center for Magnetic Resonance Research, Department of Radiology, University of Minnesota Medical School, Minneapolis, Minnesota, United States, 2 Department of Engineering Science and Mechanics, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States, 3 Center for NMR Research, Department of Radiology, Pennsylvania State University College of Medicine, Hershey, Pennsylvania, United States

In vivo MRS and MRI can benefit significantly from high/ultrahigh field in improving detection sensitivity and spectral resolution. However, the RF wave property can behave substantially differently at high field and influence both B 1 + and B 1 - fields, thus, affect the transmission and reception efficiencies as well as RF power transmission and SAR. This study aims to quantitatively investigate and compare the transmission and reception efficiencies of 1 H and common X-nuclei 31 P, 23 Na and 17 O at 7T. The results indicate that low- lower case Greek gamma nuclei require a large RF pulse voltage (or power) to achieve the same flip angle as compared to 1 H spin, nevertheless, their relative RF power demand is significantly reduced due to a higher B 1 + transmission efficiency at high field. Moreover, low- lower case Greek gamma nuclei exhibit much better reception efficiencies than that of 1 H, leading to superior detection sensitivity at high/ultrahigh field.

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