Optimal control design of turbo spin-echo sequences with applications to parallel-transmit systems

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Alessandro SbrizziShaihan J Malik

Abstract

The design of turbo spin-echo sequences is modeled as a dynamic optimization problem which includes the case of inhomogeneous transmit radiofrequency fields. This problem is efficiently solved by optimal control techniques making it possible to design patient-specific sequences online. The extended phase graph formalism is employed to model the signal evolution. The design problem is cast as an optimal control problem and an efficient numerical procedure for its solution is given. The numerical and experimental tests address standard multiecho sequences and pTx configurations. Standard, analytically derived flip angle trains are recovered by the numerical optimal control approach. New sequences are designed where constraints on radiofrequency total and peak power are included. In the case of parallel transmit application, the method is able to calculate the optimal echo train for two-dimensional and three-dimensional turbo spin echo sequences in the order of 10 s with a single central processing unit (CPU) implementation. The image contrast is maintained through the whole field of view despite inhomogeneities of the radiofrequency fields. The optimal control design sheds new light on the sequence design process and makes it pos...Continue Reading

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Citations

Dec 2, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Vincent GrasNicolas Boulant
Dec 16, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Shaihan J MalikJoseph V Hajnal
Feb 25, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Arian BeqiriShaihan J Malik
Sep 29, 2018·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Eric Van ReethDominique Sugny
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Jun 13, 2019·Topics in Magnetic Resonance Imaging : TMRI·Cem M Deniz
Jun 4, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ettore Flavio MeliadòAlexander J E Raaijmakers
Sep 26, 2020·Physics in Medicine and Biology·T BruijnenR H N Tijssen
Dec 23, 2020·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Ettore Flavio MeliadòAlexander J E Raaijmakers
Mar 24, 2021·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·A LoktyushinM Zaiss
Jun 20, 2021·Journal of Magnetic Resonance·Christina GrafRudolf Stollberger

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Software Mentioned

Armadillo
SPACE
Linux
pTx
SPINS
VISTA
DREAM
Matlab
Brain Extraction Tool

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