基于磁共振信号幅值的射频场映像技术研究

doi:10.3969/j.issn.0258-8021.2018.02.007

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Abstract Recently developed technique of in vivo magnetic resonance electrical tomography (MR EPT) can extract the electrical properties of human tissues by using the information of B₁field. Thus, robust B₁ mapping technique, regarded as the base of the technique of MR EPT, is critical for MR EPT, because the quality of B₁ maps directly affects the accuracy of MR EPT. In this paper, the B₁ field scale factor (R_i) for double angle methods (DAM), saturated turbo flash (satTFL) in the scan of the phantom and human head were calculated using the FDTD simulation, and then the performance of DAM and satTFL was evaluated based on the mean relative difference(MRD). The results indicated that the difference of R_i between above methods was less than 10% in the tissue with low dielectric properties; on the contrary, the value of R_i of DAM was higher than that of satTFL, in the tissue with high dielectric properties such as cerebrospinal fluid, even up to 21% for DAM. The research of this study can be used to select the appropriate B₁ mapping technique for different dielectric property tissues and promote the practical application of MR EPT technology.

Key words： magnetic resonance B₁ mapping techniques magnetic resonance electrical properties tomography

Received: 01 November 2016

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R318

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	Articles by authors
	Deng Guanhua
	Lan Maoying
	Duan Song
	Wang Jiajia
	Hu Can
	Xin Xuegang

Cite this article:

Deng Guanhua,Lan Maoying,Duan Song, et al. Study of B₁ Mapping Methods Based on the Amplitude of MRI[J]. Chinese Journal of Biomedical Engineering, 2018, 37(2): 181-187.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2018.02.007 OR http://cjbme.csbme.org/EN/Y2018/V37/I2/181

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