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Abstract #0753

Assessing and Correcting Respiration Induced Variation of B1 in the Liver

Francesco Padormo1, Shaihan Malik1, Joseph V. Hajnal1, David J. Larkman1

1Robert Steiner MRI Unit, Imaging Sciences Department, MRC Clinical Sciences Centre, Hammersmith Hospital, Imperial College London, London, UK

Quantitative sequences, such as those used in the liver, require accurate knowledge of flip angle. This work explores the effect of breathing on the B1 field in the liver. An average change of δθ = 4.80.8 within an ROI was seen between the inhale and exhale states in six subjects. A subject was then imaged with an 8 transmit channel whole body coil and RF shimming used to correct the variation between maximum inhalation and maximum exhalation. The variation between states was reduced from 1.6 to 0.97 for this subject.