| 摘要 |
<p>Image artifacts produced by NMR signals emanating from outside the designed spherical volume (10) in an MRI system are suppressed by interleaving preparatory pulse sequences with image pulse sequences performed during a scan. Each preparatory pulse sequence includes a pair of RF pulses (200, 204) having equal, but opposite flip angles. Spins in the image field of view are tipped and then restored by the pair of RF pulses (200, 204) and spins outside the designed spherical volume (10) are saturated.</p> |
