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000125307 1001_ $$aOrzada, Stephan$$b0
000125307 245__ $$aA method to approximate maximum local SAR in multichannel transmit MR systems without transmit phase information.
000125307 260__ $$aNew York, NY [u.a.]$$bWiley-Liss$$c2017
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000125307 520__ $$aTo calculate local specific absorption rate (SAR) correctly, both the amplitude and phase of the signal in each transmit channel have to be known. In this work, we propose a method to derive a conservative upper bound for the local SAR, with a reasonable safety margin without knowledge of the transmit phases of the channels.The proposed method uses virtual observation points (VOPs). Correction factors are calculated for each set of VOPs that prevent underestimation of local SAR when the VOPs are applied with the correct amplitudes but fixed phases.The proposed method proved to be superior to the worst-case calculation based on the maximum eigenvalue of the VOPs. The mean overestimation for six coil setups could be reduced, whereas no underestimation of the maximum local SAR occurred. In the best investigated case, the overestimation could be reduced from a factor of 3.3 to a factor of 1.7.The upper bound for the local SAR calculated with the proposed method allows a fast estimation of the local SAR based on power measurements in the transmit channels and facilitates SAR monitoring in systems that do not have the capability to monitor transmit phases. Magn Reson Med 78:805-811, 2017. © 2016 International Society for Magnetic Resonance in Medicine.
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000125307 7001_ $$0P:(DE-He78)4444ba69faa9240d7ec86ed09e6ca04e$$aBitz, Andreas$$b2$$eLast author$$udkfz
000125307 773__ $$0PERI:(DE-600)1493786-4$$a10.1002/mrm.26398$$gVol. 78, no. 2, p. 805 - 811$$n2$$p805 - 811$$tMagnetic resonance in medicine$$v78$$x0740-3194$$y2017
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