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MRI Forum: Machine Opening artifact
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Neil Brice

Tue. 28 Sep.04,
04:29
Machine Opening artifact
Does anyone know anything about the artifact created by the opening of the MR. I know it is do to bending in the magnetic feild, but is there any solutions, like a simple image transform? Or is there a specific name for this problem that I could research more?
Dan McGuan

Thu. 6 Oct.05,
20:35
 Neil,

I think you're talking about the edges of the shimmed volume of the magnet, or the coil.

Magnets are shimmed to a specific volume in the field (every model magnet is different). When you attempt to scan an object that reaches the edge of this volume you will see distortion from imaging the unshimmed area of the magnet.

Also shimming large objects that exceed the range of the receiver portion of the coil will cause distortions.

Hopefully this answers your question?

Good Luck,
Dan McGuan
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