Abdominal MR imaging at 3T

Magnetic Resonance Imaging Clinics of North America
E M MerkleErik K Paulson

Abstract

Body MR imaging at 3T is in its infancy, and should improve substantially over the next several years. Radiologists need to be aware of several limitations that are based on the laws of physics: Overall, the gain in SNR at 3T will be less than twofold (without protocol alteration) compared with a standard 1.5T MR system because of the increase in T'I'1 at ultra high field. Typically, the gain in SNR is greater in T2-weighted sequences than in TI-weighted sequences, because longer TRs allow for a more complete recovery of the longitudinal magnetization, and T2 is independent of Bo. Thus, for example, patients who are referred for an MR cholangiography may benefit from an ultrahigh-field MR examination. Chemical shift artifacts of the first kind are twice as large in ultrahigh-field MR imaging compared with standard 1.5T MR imaging. Conversely, chemical shift artifacts of the second kind do not increase in size, although the timing is altered. The increased difference in resonant frequency between water and fat at 3T also is advantageous because it allows for a better separation of the fat and water peak during MR spectroscopy, and allows better or faster fat suppression using chemical shift techniques, such as fat saturation or ...Continue Reading

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