[Intl_DxMedPhys] MRI ACR Phantom Artifacts

[High, Maynard]

MRI experienced Listers:
I have come across  some nasty artifacts in the ACR Phantom images for ACR accreditation images and wonder if anybody has any advice.

The MRI is a 2014 GE Optima MR450W.  All images were with PURE uniformity correction on and the coil was an HNS Head 12-Channel.
The phantom is the Medium sized.

First is the ACR T1 sequence:
What could be causing these rings?
[cid:feb7b676-807d-463c-b7e6-2e8085749902]

Next is the Site FSE T1 Flair

[cid:b164eb3f-93aa-4387-89d6-78e15aafcaca]
Maynard High
Medical Physics: Westchester Medical Center - NYMC
914-493-1410
maynard.high at wmchealth.org
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