TY - JOUR

T1 - A new type of MCA pulses combining constant and offset-independent adiabaticity for magnetic resonance

AU - Snadin, Alexander V.

AU - Kiryutin, Alexey S.

AU - Fishman, Natalya N.

AU - Lukzen, Nikita N.

N1 - This work is supported by the Russian Science Foundation (project No. 23-73-10103)

PY - 2025/3/22

Y1 - 2025/3/22

N2 - Adiabatic pulses are widely used in magnetic resonance techniques, and their development and refinement remain very relevant. Adiabatic inverting pulses are highly robust for radiofrequency or microwave magnetic field inhomogeneities and enable manipulation of spins over a large frequency range. In this work, new inverting pulses for spin 1/2 are proposed which combine the adiabaticity remaining constant for the single isochromat throughout the pulse and the same adiabaticity for all isochromats in a given bandwidth, but only at the single instant of time when the frequency of the pulse coincides with the frequency of the isochromat. The dependence of inversion performance of these pulses on peak amplitude of RF field, while preserving the pulse shape, is studied. These pulses may be useful for a number of MRI techniques where inverting pulses are an integral part. A comparison with other widely used adiabatic inverting pulses reveals performance improvements, achieving up to 30–40 % enhancement in inversion efficiency.

AB - Adiabatic pulses are widely used in magnetic resonance techniques, and their development and refinement remain very relevant. Adiabatic inverting pulses are highly robust for radiofrequency or microwave magnetic field inhomogeneities and enable manipulation of spins over a large frequency range. In this work, new inverting pulses for spin 1/2 are proposed which combine the adiabaticity remaining constant for the single isochromat throughout the pulse and the same adiabaticity for all isochromats in a given bandwidth, but only at the single instant of time when the frequency of the pulse coincides with the frequency of the isochromat. The dependence of inversion performance of these pulses on peak amplitude of RF field, while preserving the pulse shape, is studied. These pulses may be useful for a number of MRI techniques where inverting pulses are an integral part. A comparison with other widely used adiabatic inverting pulses reveals performance improvements, achieving up to 30–40 % enhancement in inversion efficiency.

KW - Constant adiabaticity pulses

KW - Frequency-swept pulses

KW - Inverting pulses

KW - NMR

KW - Offset independent adiabaticity pulses

UR - https://www.mendeley.com/catalogue/3ae125e0-224d-3db5-bf3e-7247d7500e91/

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-105000788924&origin=inward&txGid=43ba57fbb3422577b9a619359187edf8

U2 - 10.1016/j.mri.2025.110385

DO - 10.1016/j.mri.2025.110385

M3 - Article

C2 - 40127742

VL - 120

SP - 110385

JO - Magnetic Resonance Imaging

JF - Magnetic Resonance Imaging

SN - 1873-5894

M1 - 110385

ER -