[Intl_DxMedPhys] Fluoro minimum SSD

[William Sensakovic]

The cfr seems pretty clear that 30cm is only for portables. Are you comfortable sharing the vendor? Small and new vendors often save money by not hiring experts in informatics nor regulations. Had this experience before, though not for the cone size. They basically just want to make a mark quickly and get bought out by one of the big boys. Curious if this is an established vendor or small start up.
Best,
Bill

William F. Sensakovic, PhD, MRSC(MRSE), FAAPM
Chair and Assoc. Prof., Mayo Clinic (Arizona)
Founder, Telerad Physics Teaching, LLC
Twitter: @wfsensak
________________________________
From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu> on behalf of Tao, Ashley T via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Sent: Thursday, October 16, 2025 11:04 AM
To: DxMedPhys List <intl_dxmedphys_wd_osu_list at lists.osu.edu> <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Subject: [Intl_DxMedPhys] Fluoro minimum SSD

Hey all,
We recently had a stationary c-arm unit installed and it came with a short and tall cover. The short cover provides a minimum SSD of 30cm whereas the tall cover provides a minimum SSD of 38cm. The manufacturer said their customers typically install the short cover because that's what the providers prefer. It gives them more flexibility with angles. Sure enough, that's what our providers wanted.

Both 21 CFR and state of wisconsin says that the minimum SSD for stationary fluoroscopes must be 38 cm, but the short cover does not meet this requirement. Curious if anyone else has dealt with this. Their FSE says that the customer has the choice of which cover they want to use. I have asked for feedback from the manufacturer but have not yet received a response.  Before I upset my providers by making them switch to the tall cover, is there something in the regs that I'm not seeing that allows them to use the 30 cm SSD? Would anyone know why they offer the short cover if fed and state requirements require 38 cm?

Thanks
Ashley



Ashley Tao, PhD, DABR, MRSE (MRSC™)

Lead Diagnostic Medical Physicist

Radiation Safety Officer

Emplify Health by Gundersen

1900 South Ave

Mail Stop H01-016

La Crosse, WI 54601

attao at emplifyhealth.org

(w) 608-775-2078

(c) 507-398-1561

[cid:5b82ed84-b2b6-4d2b-a120-c256a8ee62df]


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