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MRI Forum: When to shim?
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Matt H

Fri. 27 Oct.17,
13:23
When to shim?
On what sequences should a shim volume be added? (GE scanner)

Steven Ford

Fri. 26 Oct.18,
02:29
you ask a complex question. Any sequence that is not a standard spin echo can benefit from shimming, but its not always worth it.

If you are scanning a knee in the center of the magnet, or nearly so, you might not see much difference in gradient echo scans, which in general are quite sensitive to shim problems. But if you are doing fat-water separation or fatsat images, you will see a difference even in this example.

Because hardware varies, its hard to say in one blanket statement for every case. For sure, do it on fatsat or fat-water imaging. The next most sensitive studies are off-center imaging such as shoulders. Beyond that, you should experiment a little. Of course, erring on the side of caution is a good idea.
 
 

Steven Ford
Professional Imaging Services, Inc.

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