What types of magnet are used in magnetic resonance mammography (breast MRI)?

Updated: Feb 25, 2019
  • Author: Preeti Gupta, MD, FRCR; Chief Editor: Eugene C Lin, MD  more...
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Answer

Answer

For breast MRI, most facilities use a 1.5T or higher-strength magnet. Narrow separation of fat and water peaks at mid and low field strengths, which precludes effective fat suppression. Although image subtraction techniques can overcome this to some extent, motion artifacts remain a major limitation of this postprocessing method for the removal of fat signal. Sensitivity to gadolinium enhancement is reduced at lower field strengths because of the inherently shorter T1 of all tissues. The signal-to-noise ratio (SNR) of all MRI methods is directly proportional to the field strength: at 1.5T, the SNR is 3 times greater than the SNR at 0.5T.


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