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000292075 1001_ $$0P:(DE-He78)7985b432d853ab8929db0f1cb121667f$$aOrzada, Stephan$$b0$$eFirst author$$udkfz
000292075 245__ $$aHybrid algorithms for SAR matrix compression and the impact of post-processing on SAR calculation complexity.
000292075 260__ $$aNew York, NY [u.a.]$$bWiley-Liss$$c2024
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000292075 500__ $$a#EA:E020#LA:E020# / 2024 Dec;92(6):2696-2706
000292075 520__ $$aThis study proposes faster virtual observation point (VOP) compression as well as post-processing algorithms for specific absorption rate (SAR) matrix compression. Furthermore, it shows the relation between the number of channels and the computational burden for VOP-based SAR calculation.The proposed new algorithms combine the respective benefits of two different criteria for determining upper boundedness of SAR matrices by the VOPs. Comparisons of the old and new algorithms are performed for head coil arrays with various channel counts. The new post-processing algorithm is used to post-process the VOP sets of nine arrays, and the number of VOPs for a fixed median relative overestimation is compared.The new algorithms are faster than the old algorithms by a factor of two to more than 10. The compression efficiency (number of VOPs relative to initial number of SAR matrices) is identical. For a fixed median relative overestimation, the number of VOPs increases logarithmically with the number of RF coil channels when post-processing is applied.The new algorithms are much faster than previous algorithms. Post-processing is very beneficial for online SAR supervision of MRI systems with high channel counts, since for a given number of VOPs the relative SAR overestimation can be lowered.
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000292075 650_7 $$2Other$$aMRI
000292075 650_7 $$2Other$$aSAR
000292075 650_7 $$2Other$$aVOP compression
000292075 650_7 $$2Other$$aVOPs
000292075 650_7 $$2Other$$alocal
000292075 650_7 $$2Other$$aspecific absorption rate
000292075 650_7 $$2Other$$avirtual observation points
000292075 7001_ $$0P:(DE-He78)bcbe9862276365dd99a98b48449fd046$$aFiedler, Thomas$$b1$$udkfz
000292075 7001_ $$0P:(DE-He78)022611a2317e4de40fd912e0a72293a8$$aLadd, Mark$$b2$$eLast author$$udkfz
000292075 773__ $$0PERI:(DE-600)1493786-4$$a10.1002/mrm.30235$$gp. mrm.30235$$n6$$p2696-2706$$tMagnetic resonance in medicine$$v92$$x1522-2594$$y2024
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