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Abstract #1803

Towards Real-Time SAR Measurement with MR Thermometry

Changqing Ye1, An Jing2, Yan Zhuo1, Rong Xue1, Jing Chen1

1State Key Laboratory of Brain and Cognitive Science, Beijing MRI Center for Brain Research, Institute of Biophysics, Chinese Academy of Sciences, Beijing, China; 2Siemens Mindit Magnetic Resonance Ltd., Shenzhen, Guangzhou, China

For ultra-high field imaging, many sequences are limited by the increased RF energy deposition, conventionally quantified by Specific Absorption Rate (SAR) which is an indirect estimation method, causing lack of subjects safety guarantee or unnecessary scan limitations. In this work, we present a PRF-based MR thermometry method to supervise temperature increased by the RF energy deposition directly with real-time temperature measurement with a very high precision (<0.1) within a very short time (2 s). This method might be used to monitor temperature change in subjects directly, which would be especially useful for ultra-high field imaging.

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