Optimal control pulse design: Solving low tip angle BIR-4 excitation challenges in X-nuclei spectroscopy

Le résumé fourni par la source

Motivation: Adiabatic BIR-4 pulses, employed for $$$B_1^+$$$ robust spectroscopic excitation, exhibit frequency-dependent modulations in received signals, especially at low tilt angles. These modulations interfere with accurate quantitative analysis. Goal(s): The study aims to examine BIR-4 overshoots at low $$$B_1^+$$$ and introduces optimal control RF pulses to mitigate these issues. Approach: We investigate and compare BIR-4 and optimal control RF pulses in simulations, phantom experiments, and in-vivo 31P spectroscopy. Results: We show that optimal control RF pulse design is imperative for obtaining accurate quantitative data. Optimal control RF pulses have the potential to significantly improve in-vivo 31P magnetic resonance spectroscopy. Impact: Optimal control pulses offer precise excitation, surpassing BIR-4 under low flip angles and challenging transmit conditions. This ensures a stable magnetization steady-state, vital for accurate quantitative analysis in applications such as enzymatic exchange rate measurement via magnetization transfer spectroscopy.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.