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000293575 041__ $$aEnglish
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000293575 1001_ $$0P:(DE-He78)bcbe9862276365dd99a98b48449fd046$$aFiedler, Thomas$$b0$$eFirst author$$udkfz
000293575 245__ $$aLocal and whole-body SAR in UHF body imaging: Implications for SAR matrix compression.
000293575 260__ $$aNew York, NY [u.a.]$$bWiley-Liss$$c2025
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000293575 500__ $$a#EA:E020#LA:E020# / 2025 Feb;93(2):842-849
000293575 520__ $$aTransmit arrays for body imaging have characteristics of both volume and local transmit coils. This study evaluates two specific absorption rate (SAR) aspects, local and whole-body SAR, of arrays for body imaging at 7 T and also for a 3 T birdcage.Simulations were performed for six antenna arrays at 7 T and one 3 T birdcage. Local SAR matrices and the whole-body SAR matrix were computed and evaluated with random shims. A set of reduced local SAR matrices was determined by removing all matrices dominated by the whole-body SAR matrix.The results indicate that all RF transmit coils for body imaging in this study are constrained by the local SAR limit. The ratio between local and whole-body SAR is nevertheless smaller for arrays with large FOV, as these arrays also expose a larger part of the human body. By using the whole-body SAR matrix, the number of local SAR matrices can be reduced (e.g., 33.3% matrices remained for an 8-channel local array and 89.7% for a 30-channel remote array; 12.1% for the 3 T birdcage).For transmit antenna arrays used for body imaging at 7 T as well as for the 3 T birdcage, all evaluated cases show that the local SAR limit was reached before reaching the whole-body SAR limit. Nevertheless, the whole-body SAR matrix can be used to reduce the number of local SAR matrices, which is important to reduce memory and computing time for a virtual observation points (VOP) compression. This step can be included as a pre-compression prior to a VOP compression.
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000293575 650_7 $$2Other$$aUHF body imaging
000293575 650_7 $$2Other$$aVOPs
000293575 650_7 $$2Other$$alocal SAR
000293575 650_7 $$2Other$$awhole‐body SAR
000293575 7001_ $$0P:(DE-He78)022611a2317e4de40fd912e0a72293a8$$aLadd, Mark E$$b1$$udkfz
000293575 7001_ $$0P:(DE-He78)7985b432d853ab8929db0f1cb121667f$$aOrzada, Stephan$$b2$$eLast author$$udkfz
000293575 773__ $$0PERI:(DE-600)1493786-4$$a10.1002/mrm.30306$$gp. mrm.30306$$n2$$p842-849$$tMagnetic resonance in medicine$$v93$$x1522-2594$$y2025
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