A novel triple-angle method for rapid B1+ mapping
Konferenz: BIBE 2019 - The Third International Conference on Biological Information and Biomedical Engineering
20.06.2019 - 22.06.2019 in Hangzhou, China
Tagungsband: BIBE 2019
Seiten: 5Sprache: EnglischTyp: PDF
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Autoren:
Guo, Hongyu; Ma, Gaochao (Institute of Biomedical Electromagnetic Engineering, Shenyang University of Technology, Shenyang, China & Neusoft Medical Systems, China)
Yu, Zhongnan (Institute of Biomedical Electromagnetic Engineering, Shenyang University of Technology, Shenyang, China)
Inhalt:
In MRI, The B1+ distribution of RF field have an great significance in many aspects of MRI, particular for quantitative MRI. There are many methods have been proposed for B1+ mapping. These methods have several restrictions, such as long TR or scan time. In this regard, we propose a novel method for rapidly B1+ mapping based on the method of variable flip angles (VFA). Flip angle correction factors were introduced for B1+ mapping using the signal intensity ratio of three images measured at three proportional excitation angles, and then to solve the equation to achieve the B1+ map. The new method was compared with the double angle method (DAM) in several phantom and in vivo experiments at 1.5Tesla. In phantom experiments, an accurate B1+ map was obtained using the new method. The resulting B1+ maps had a decreased repetition time (TR) and were in excellent agreement. In brain and leg imaging, the method obtained B1+ maps even when TR<