Abstract #0680

Quantification of Long and Ultra-short Relaxation Times in Tissues with Ultra-short TE MR Fingerprinting (UTE-MRF)

Qing Li¹, Xiaozhi Cao¹, Huihui Ye^1,2, Congyu Liao¹, Hongjian He¹, and Jianhui Zhong¹

¹Center for Brain Imaging Science and Technology, Key Laboratory for Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrumental Science, Zhejiang University, Hangzhou, China, ²State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China

Magnetic resonance fingerprinting (MRF) has been combined with ultra-short echo time technique (UTE-MRF) to enable the quantification of ultra-short T₂/T₂* tissues. A TE sinusoidal variation pattern is introduced to UTE-MRF acquisition to improve the ultra-short T₂ detection accuracy to sub-millisecond. With the golden angle spiral acquisition and sliding window reconstruction, quantitative T₁ and T₂ maps of regular and ultra-short T₂/T₂* tissue components are acquired at 14s per slice. Since the B₀ induced phase variation has been encoded into the signal evolution with variable TE, the B₀ map is simultaneously obtained.

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