MR, like CT, requires the patient to lie still on a special table inside the scanning gantry for ten to thirty minutes. However, during the conventional "high-field" MR exam, patients must lie completely still for shorter durations of five t o ten minutes at a time. The CT exam may only require patient cooperation for a few seconds to a few minutes at a time. Due to the longer examination times of MR and the closed nature of the cylindrical magnet used in traditional "high-field" MR equipment (0.5 to 1.5 Tesla magnetic field strength), some patients who undergo MR may experience claustrophobic anxiety.
Technical innovation is bringing new, "friendlier" MR designs like "short-bore MR" into routine clinical use. Also becoming available are new versions of conventional "high-field" (cylindrical) MR systems with shorter magnets and more patient friendly (wider and shorter) aperture designs. These new "short-bore" systems promise to also further minimize patient anxiety about MR examination.
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