[Intl_DxMedPhys] Shielding for a panoramic unit

[andrew schneider]

I believe that most PANO units will shortly be converted to CBCT units
(using the same location).

Therefore I would suggest that you shield for a CBCT unit.


Andrew Schneider, Ph.D.,DABR (R,T), CMD, CRE (R,T,M), AMP, CSD



On Wed, Feb 12, 2025 at 7:26 PM Gary via Intl_dxmedphys_wd_osu_list <
intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

> Could someone eyeball this and tell me if I have missed something?
>
> Shielding for a panoramic unit:  I have the manufacturers specs which give
> upper range patient doses of 200 mGycm^2, and I have a 2018 paper reporting
> patient scatter at 1 m for 80 kVp beams as 9.3 nGy/(mGycm^2).
>
> Assuming 50 pt / wk and rounding 9.3 to 10, I get a scatter of 10 x 200 *
> (100 / 2) =
>         1e5 nGy or 0.1 mGy per week.
>
> And that would go to about 0.025 mGy at 2 meters.  If the workload were
> 4/5 lower, 40 pt/wk, the unshielded scatter would be 0.02 mGy, the
> threshold for no lead if all fully occupied uncontrolled spaces are more
> than 6' away.
>
> Its been a long time since I looked at pano shielding - any suggestions
> are appreciated.
>
>
> ---
> Thanks,
> Gary Isenhower
>
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