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001     293575
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024 7 _ |a 10.1002/mrm.30306
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037 _ _ |a DKFZ-2024-01898
041 _ _ |a English
082 _ _ |a 610
100 1 _ |a Fiedler, Thomas
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245 _ _ |a Local and whole-body SAR in UHF body imaging: Implications for SAR matrix compression.
260 _ _ |a New York, NY [u.a.]
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500 _ _ |a #EA:E020#LA:E020# / 2025 Feb;93(2):842-849
520 _ _ |a Transmit 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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650 _ 7 |a UHF body imaging
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650 _ 7 |a VOPs
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650 _ 7 |a local SAR
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650 _ 7 |a whole‐body SAR
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700 1 _ |a Ladd, Mark E
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700 1 _ |a Orzada, Stephan
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773 _ _ |a 10.1002/mrm.30306
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856 4 _ |u https://inrepo02.dkfz.de/record/293575/files/Magnetic%20Resonance%20in%20Med%20-%202024%20-%20Fiedler%20-%20Local%20and%20whole%E2%80%90body%20SAR%20in%20UHF%20body%20imaging%20Implications%20for%20SAR%20matrix.pdf
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