Abstract #4166

Ultimate Intrinsic Specific Absorption Rate Efficiency

Alireza Sadeghi-Tarakameh^1,2, Xiaoping Wu³, Firdevs Ulus⁴, Yigitcan Eryaman³, and Ergin Atalar^1,2

¹Electrical and Electronics Engineering, Bilkent University, Ankara, Turkey, ²National Magnetic Resonance Research Center (UMRAM), Ankara, Turkey, ³Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, United States, ⁴Industrial Engineering Department, Bilkent University, Ankara, Turkey

Peak local specific absorption rate (SAR) is a limiting factor for many high and ultrahigh field MRI applications. Therefore, improving the SAR performance of the transmitters is the scope of many studies. In this study, we used the SAR efficiency (B₁⁺/sqrt(peak local SAR)) as a metric to evaluate the SAR performance of transmitters and investigated its upper bound, defined as Ultimate Intrinsic SAR Efficiency (UISARE). For proof of concept, we derived the UISARE values at 1.5T and 10.5T and compared to the SAR efficiencies of a 1.5T birdcage coil and a 10.5T eight-channel array of fractionated dipoles.

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