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Abstract #0913

Sensitivity of Transmit Coil B1+ to Lung Inflation in Hyperpolarised 3He MRI

Jim M. Wild1, Martin H. Deppe1, Salma Ajraoui1, Helen Marshall1, Graham Norquay1, Titus Lanz2, Matthias Behr2, Francesco Padormo3, Juan Parra-Robles1, Sebastian Kozerke4

1University of Sheffield, Sheffield, Yorkshire, United Kingdom; 2Rapid Biomedical; 3Imperial College, United Kingdom; 4Imaging Sciences, Kings College London

Hyperpolarised gas MRI is highly sensitive to RF flip angle (FA) and B1+ homogeneity, thus accurate knowledge of the delivered flip angle and a spatially homogeneous B1+ field are both highly desirable. Chest birdcage coils have been developed for both 3He and 129Xe lung MRI at 1.5T providing homogenous B1+ fields over the lung FOV. In 1H multi-transmit coil imaging of the abdomen at 3T, modulation of the delivered B1+ has been reported as a function of breathing cycle. In this work the effect of lung inflation upon the B1+ field delivered by two 3He chest birdcage coils was investigated at 1.5T and 3T.