[Intl_DxMedPhys] GE Pristina Flat Field Uniformity

[Palmer, Matthew R. (BIDMC - Radiology)]

Dear Colleagues,

Multiple times recently, I've found artifacts when performing the Artifact Eval and Flat Field uniformity test, on the 2D Rh/Ag acquisitions for the GE Pristina mammo unit.  I've pasted in a portion of my iPhone snapshot from the AWS display.  The image quality isn't pristine(a) and I've introduced a Moire pattern (there's no 'zipper'-like artifact in reality) but I think you can see the mottled appearance pretty clearly.

After the FSE runs the gain cal, the artifacts disappear - for about a day then reappear.

FSE's feedback from GE experts is that not to worry - the artifacts won't affect clinical images.  That's hard to swallow.

I was astonished that the tech's weren't picking up the artifacts in their weekly QC so I ran their Flat Field test from the tech IQST Weekly QC page.  The images shown briefly (but not saved as far as I can tell) during the test sequence look perfect (although you can't adjust the window/level).

I'm wondering if anyone has had this problem or can shed any light on it.

Matt Palmer
BIDMC Radiology



Matthew R. Palmer, PhD, DABR
Director, Medical Imaging Physics, Department of Radiology
Assistant Professor, Harvard Medical School
Beth Israel Deaconess Medical Center
330 Brookline Avenue
Boston, MA 02215
office: 617-667-0176 fax: 617-667-2770
mobile: 617-794-1736 pager: 617-632-7243 #32214

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