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,
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.