In magnetic resonance imaging (MRI) , signal intensity is dependent on the substances in a voxel. The signal is decayed when Air gap is present. In addition to that, the presence of Air gap creates a local inhomogeneity in a magnetic field, causing artifact on MR images.
Consequently, it is said that the influence of Air gap is less in fast spin-echo (FSE) sequences than spinecho (SE) sequences. We analyzed the effect of air on slice profiles of both SE sequences and FSE sequences in numerical simulation with Bloch equations. As a result, we confirmed that slice profile is more distorted in FSE sequences compared to SE sequences.
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