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Abstract #0476

Non-CPMG Multiband FSE for Improved SNR Efficiency on a Portable Low Field System

Philip Kenneth Lee1, Yueqi Qiu1, Jieqiong Liu2, Fan Jiang2, and Zhiyong Zhang1
1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China, 2Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, School of Medicine, Shanghai Jiao Tong University, Shanghai, China

Synopsis

Keywords: Low-Field MRI, RF Pulse Design & Fields

Motivation: Improve SNR efficiency of Fast Spin Echo on low field systems by leveraging the higher RF amplitudes and lower SAR limitations provided by lower field strengths.

Goal(s): Perform multiband T2-weighted acquisitions with relaxed CPMG phase constraints.

Approach: CPMG and non-CPMG multiband-4 pulses were designed by modulating Shinnar-Le Roux pulses with optimal multiband phases. Quadratic phase increment scheme was used to produce a stable non-CPMG echo train.

Results: Non-CPMG artifacts were effectively eliminated using a quadratic phase increment scheme. Multiband-4 images had improved SNR compared to single-band images. Fast recovery improved CSF contrast but its intensity still differed with multiband due to shorter TRs.

Impact: The application of multiband Fast Spin Echo (FSE) refocusing pulses that do not satisfy CPMG phase constraints was achieved using a quadratic phase increment scheme. Employing quadratic phase increment schemes may permit relaxation of other common FSE design constraints.

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