Abstract #1508

Performance evaluation of a B0-shim multi-coil system for small animal temperature mapping at 3T

Qiaoyan Chen^1,2, Jo Lee^1,2, Jianghong Wen^1,2, Chao Zou^1,2, Xiaoliang Zhang^3,4, Xin Liu^1,2, and Ye Li^1,2

¹Lauterbur Imaging Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China, ²Shenzhen Key Laboratory for MRI, Shenzhen, China, ³Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, United States, ⁴UCSF/UC Berkeley Joint Graduate Group in Bioengineering, San Francisco, CA, United States

The magnetic field variation is a critical factor affecting the accuracy of temperature measurement in MRT. In this study, a 5-channel B0-shim coil was constructed for small animal temperature mapping in the MRI guided high intensity focused ultrasound (HIFU) at 3T. Firstly, the shimming ability was evaluated by the phantom study with a result that the standard deviation (STD) value of the offset magnetic field has reduced to 69% after currents optimized. Secondly, the relationship between T2* and SNR improvement has been studied. The results demonstrate that the temperature measurement accuracy is improved by 8% with the local multiple B0-shim coils.

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