Fat Suppression in MR Imaging: Techniques and Pitfalls

Short TI Inversion Recovery (STIR) sequences can be utilized as a fat suppression technique in MR Imaging. While the other fat suppression techniques are based on the difference between the precession frequency of water and fat, STIR is based on the difference in T1 relaxation time between water and fat in order to achieve fat suppression. 
A big advantage of using the STIR sequence is that it is relatively insensitive to magnetic field inhomogeneities (both Β0 and B1) .
Figure shows a sagittal T2-w with chemical fat saturation (A) and a sagittal T2-w STIR (B) of the knee. The susceptibility artifacts (red arrows) arise due to the metallic prosthesis in situ and are more obvious in image (A) compared to image (B). Moreover, image (B) provides robust fat suppression. This is because STIR acquisitions are not sensitive to Β0 magnetic field inhomogeneities. Image dataset acquired at 1.5 Tesla.

Fat Suppression in MR Imaging Techniques and Pitfalls

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