Adiabatic inversion pulses for myocardial T1 mapping
Open Access
- 30 May 2013
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Medicine
- Vol. 71 (4), 1428-1434
- https://doi.org/10.1002/mrm.24793
Abstract
Purpose To evaluate the error in T1 estimates using inversion‐recovery‐based T1 mapping due to imperfect inversion and to perform a systematic study of adiabatic inversion pulse designs in order to maximize inversion efficiency for values of transverse relaxation (T2) in the myocardium subject to a peak power constraint. Methods The inversion factor for hyperbolic secant and tangent/hyperbolic tangent adiabatic full passage waveforms was calculated using Bloch equations. A brute‐force search was conducted for design parameters: pulse duration, frequency range, shape parameters, and peak amplitude. A design was selected that maximized the inversion factor over a specified range of amplitude and off‐resonance and validated using phantom measurements. Empirical correction for imperfect inversion was performed. Results The tangent/hyperbolic tangent adiabatic pulse was found to outperform hyperbolic secant designs and achieve an inversion factor of 0.96 within ±150 Hz over 25% amplitude range with 14.7 µT peak amplitude. T1 mapping errors of the selected design due to imperfect inversion was ∼4% and could be corrected to <1%. Conclusions Nonideal inversion leads to significant errors in inversion‐recovery‐based T1 mapping. The inversion efficiency of adiabatic pulses is sensitive to transverse relaxation. The tangent/hyperbolic tangent design achieved the best performance subject to the peak amplitude constraint. Magn Reson Med 71:1428–1434, 2014.Funding Information
- NIH/NHLBI Intramural Research Program
This publication has 25 references indexed in Scilit:
- Modified Look‐Locker T1 evaluation using Bloch simulations: Human and phantom validationMagnetic Resonance in Medicine, 2012
- T2-dependent errors in MOLLI T1 values: simulations, phantoms, and in-vivo studiesJournal of Cardiovascular Magnetic Resonance, 2012
- Extracellular volume imaging by magnetic resonance imaging provides insights into overt and sub-clinical myocardial pathologyEuropean Heart Journal, 2012
- Extracellular volume fraction mapping in the myocardium, part 1: evaluation of an automated methodJournal of Cardiovascular Magnetic Resonance, 2012
- Myocardial extravascular extracellular volume fraction measurement by gadolinium cardiovascular magnetic resonance in humans: slow infusion versus bolusJournal of Cardiovascular Magnetic Resonance, 2011
- Quantification of Diffuse Myocardial Fibrosis and Its Association With Myocardial Dysfunction in Congenital Heart DiseaseCirculation: Cardiovascular Imaging, 2010
- Implementation equations for HSn RF pulsesJournal of Magnetic Resonance, 2010
- Robust water/fat separation in the presence of large field inhomogeneities using a graph cut algorithmMagnetic Resonance in Medicine, 2009
- Saturated double‐angle method for rapid B1+ mappingMagnetic Resonance in Medicine, 2006
- Modified Look‐Locker inversion recovery (MOLLI) for high‐resolution T1 mapping of the heartMagnetic Resonance in Medicine, 2004