NMR Imaging: Current Status and Future Prospects
For magnetic resonance imaging in medicine it is important to be able to image rapidly as well as produce images of high spatial resolution. The speed is important because the body is in general moving. There are roughly three time regimes which are important in determining the imaging speed. The slowest is on a time scale of about 20 seconds and is the time a normal person could reasonably be expected to hold their breath. The second time regime is around 4 or 5 seconds and is the time scale at which peristaltic and intestinal motion occurs. The third and fastest regime is heart motion, and here it is necessary to image at times considerably less than 1 second in order to effectively ‘freeze’ cardiac motion in time.
PACS nos70.1214 51.1214
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