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Abstract #4253

Joint design of a 90° - 180° spokes pulse in pTX for 2D TSE imaging at 11.7 Tesla

Joseph Brégeat1, Aurélien Massire2, Nicolas Boulant1, Vincent Gras1, and Franck Mauconduit1
1Paris-Saclay University, CEA, CNRS, BAOBAB, NeuroSpin, Gif-sur-Yvette, France, 2Siemens Healthcare, Courbevoie, France

Synopsis

Keywords: High-Field MRI, Pulse Sequence Design

Motivation: The 2D TSE sequence is widely used in clinical neuroimaging. However, at 11.7T, B₀ inhomogeneity and significant variations in B₁⁺ transmit field strength reduce image quality. Developing pulse design strategies to homogenize both excitation and refocusing is essential for performing 2D TSE at ultra-high field strengths.

Goal(s): We propose a joint design approach to design the 90°-180° pulse pair.

Approach: Three strategies are investigated : 1) double angle, 2) the scaling error penalty and 3) the joint design approach.

Results: The simulations show that the joint design is a promising approach giving good NRMSE with a strict respect of the CPMG condition.

Impact: The joint design appears to be a promising strategy, enabling the generation of excitation and refocusing pulses while enforcing the respect of CPMG condition. This is a key step toward enabling 2D TSE sequences at ultra-high fields.

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