[Intl_DxMedPhys] NM uniformity flood to ACR

[Nima Kasraie]

For tiny rooms with short ceilings, I typically tilt the head (L-mode) to ~45 degrees towards the corner of the wall-ceiling (where I attach source to), and make sure center of head is aligned to source, using a pocket laser level tool.


Nima



From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu> On Behalf Of Brian Methe via Intl_dxmedphys_wd_osu_list
Sent: Thursday, October 30, 2025 8:39 AM
To: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: [Intl_DxMedPhys] NM uniformity flood to ACR

Good Morning: In an ACR accreditation submission for a Siemens Symbia imager, the reviewer did not like the uniformity image. This flood was performed with a Tc-99m point-source. Source/imager distance or source/imager alignment were stated


Good Morning:



In an ACR accreditation submission for a Siemens Symbia imager, the reviewer did not like the uniformity image. This flood was performed with a Tc-99m point-source. Source/imager distance or source/imager alignment were stated as possible causes. ACR instructions explicitly prohibit the submission of a curvature corrected point-source flood, the daily QC procedure for these imagers. No problem, I don’t love black-box corrections either. However, if distance/alignment was an issue on the first try, they could be an issue during the second, especially in a small imager room. The ACR’s instructions allow Co-57 floods which implies a sheet source. Well, experience in these situations has taught to confirm and not assume and thus have to repeat. So, when asked to confirm that a Co-57 sheet source uniformity flood was acceptable for this re-submission, the answer from the ACR was equivocal. I am hoping someone has a better answer: can a Co-57 sheet source be used to provide a uniformity flood image for ACR accreditation when Tc-99m point-source floods were originally submitted?



As the goal is to demonstrate uniformity, I believe the answer is “yes”. But, the ACR is at times inscrutable. And as I have stated, twice bitten, always shy.



If you have gotten this far, thank you.



Brian.M. Methe'

________________________________

UT Southwestern

Medical Center

The future of medicine, today.
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