[Intl_DxMedPhys] Pristina SNR deviation

[Dylan DeAngelis]

Hi Lee,

Did you ever resolve this? After reading about your issue, I had a site updating their Pristina software and I was able to get in and chat with Applications about this exact thing. I was told that the new software erases the existing SNR baseline, which is why that SNR deviation goes to 0.0. But the solution is for the tech to perform a new 5-day average, after which that average becomes the new baseline and everything should go back to normal. For my site, it hasn’t been five business days yet, so I have not confirmed that everything worked out as Applications explained.

Let me know if that info is of any use to you. If resetting the baseline following the 5-day average doesn’t resolve the issue, I will send an update.

Thanks,

Dylan DeAngelis, MS, DABR
NYS Licensed Medical Physicist
(Diagnostic Radiological Physics and Medical Nuclear Physics)

Upstate Medical Physics – Diagnostic Radiology, Medical Nuclear & Medical Health Physics, P.C.
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From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+ddeangelis=upstatemp.com at lists.osu.edu> On Behalf Of Lee Kiessel via Intl_dxmedphys_wd_osu_list
Sent: Tuesday, May 12, 2026 11:41 AM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: [Intl_DxMedPhys] Pristina SNR deviation

I just recently learned that on the Pristina software versions 7. 70. 28 & 7. 70. 51 the SNR deviation in the AOP & SNR test in the IQ tool does not actually calculate correctly. It displays as ‘0. 00’ and indicates a ‘Pass’
I just recently learned that on the Pristina software versions 7.70.28 & 7.70.51 the SNR deviation in the AOP & SNR test in the IQ tool does not actually calculate correctly.  It displays as ‘0.00’ and indicates a ‘Pass’ regardless of what the measured SNR is.

The response I have gotten from GE is more less ‘Yes, that how it works and the technologist needs to manually calculate the SNR deviation’.  This is entirely unsatisfying to me.

To my knowledge, we were not informed of this behavior when the software was updated to these versions.  Prior versions correctly calculated SNR deviation as well as newer versions.  The QC manual does not explicitly state the need to manually calculate this value, but says “Check that all results pass and record them or export them later”, which the IQ tool does report a value (though incorrect) and a “Pass” for this test.  There is no place on the QC forms to record the baseline SNR from which the techs need calculate the deviation, implying to me that it’s not really the intended expectation.

Has anyone seen or had any communication from GE on this issue?

To me, this seems like a bug that GE knows about, but their failure to communicate it to us has caused us to technically not be in compliance with their QC program as the techs have just been accepting the incorrectly reported value and  subsequent ‘Pass’.

Lee M Kiessel, PhD, DABR | Chief Diagnostic Physicist
Avera McKennan Hospital and University Health Center
1325 S Cliff Ave | Sioux Falls, SD 57105
Direct: 605-322-6279 | Cell: 605-838-8089

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