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Abstract #2648

On the SAR load of typical head protocols at 7T

Oliver Kraff1, Britta M Hüning2, Andreas Deistung1,3, Viktor Pfaffenrot1, Andreas K Bitz4, Mark E Ladd1,4, and Harald H Quick1,5

1Erwin L. Hahn Institute for MRI, University Duisburg-Essen, Essen, Germany, 2Clinic of Pediatrics I, Neonatology, University Hospital Essen, Essen, Germany, 3Medical Physics Group, Institute of Diagnostic and Interventional Radiology, Friedrich Schiller University Jena, Jena, Germany, 4Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 5High Field and Hybrid MR Imaging, University Hospital Essen, Essen, Germany

In this retrospective study, log files of the RF safety watchdog system were evaluated from 30 head exams performed at 7T in conjunction with the widely available 32-channel Nova Medical head coil. Head local SAR as reported by the PALI and the start/end times of each sequence were compared for eight different sequence types. This study aimed at providing insights into the expected RF exposure in UHF neurological protocols and may become useful in simulations to study realistic exposure scenarios, as well as to determine which sequences may be acceptable if a SAR reduction is required for a 7T exam.

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