Abstract #0874

Experimental Comparisons of MRF-FISP Using Optimized Fractional Dictionary and B1 Correction

Lixian Zou^1,2, Huihui Ye³, Shi Su¹, Haifeng Wang¹, Dong Liang^1,4, Xin Liu¹, and Hairong Zheng¹

¹Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences, Shenzhen, China, ²Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen, China, ³State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Zhejiang, China, ⁴Research Center for Medical AI, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China

MRF is a time-efficient technique to simultaneously measure of multiple parameters through pattern recognition. The completeness of dictionary to describe the signal evolution process in NMR system is very important to acquire the accurate T₁ and T₂ values. A new dictionary, generated by using fractional Bloch equations and B₁ correction, is proposed to improve the MRF-FISP accuracy. In this work, we compared the accuracy of relaxation values with three dictionary models through phantom and in-vivo experiments. Results illustrated that dictionary generated through fractional Bloch equation with B₁ correction is the best to approach T₁ and T₂ standards.

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