Inversion recovery at 7 T in the human myocardium: measurement of T(1), inversion efficiency and B(1) (+).

Abstract

At clinical MRI field strengths (1.5 and 3 T), quantitative maps of the longitudinal relaxation time T1 of the myocardium reveal diseased tissue without requiring contrast agents. Cardiac T1 maps can be measured by Look-Locker inversion recovery sequences such as ShMOLLI at 1.5 and 3 T. Cardiovascular MRI at a field strength of 7 T has recently become feasible, but doubts have remained as to whether magnetization inversion is possible in the heart due to subject heating and technical limitations. This work extends the repertoire of 7 T cardiovascular MRI by implementing an adiabatic inversion pulse optimized for use in the heart at 7 T. A "ShMOLLI+IE" adaptation of the ShMOLLI pulse sequence has been introduced together with new postprocessing that accounts for the possibility of incomplete magnetization inversion. These methods were validated in phantoms and then used in a study of six healthy volunteers to determine the degree of magnetization inversion and the T1 of normal myocardium at 7 T within a 22-heartbeat breathhold. Using a scanner with 16 × 1 kW radiofrequency outputs, inversion efficiencies ranging from -0.79 to -0.83 (intrasegment means; perfect 180° would give -1) were attainable across the myocardium. The myocardial T1 was 1925 ± 48 ms (mean ± standard deviation).

DOI: 10.1002/mrm.24548
010203020132014201520162017
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@article{Rodgers2013InversionRA, title={Inversion recovery at 7 T in the human myocardium: measurement of T(1), inversion efficiency and B(1) (+).}, author={Christopher T Rodgers and Stefan K. Piechnik and Lance DelaBarre and Pierre-François van de Moortele and Carl J. Snyder and Stefan Neubauer and Matthew D. Robson and J. Thomas Vaughan}, journal={Magnetic resonance in medicine}, year={2013}, volume={70 4}, pages={1038-46} }