[Intl_DxMedPhys] Out of Field Fetal Dose Calculations

[Daniel Vergara]

While I can’t think of a more modern reference for the fetal dose calc, I can point you to a publication by Dr. Kevin Wunderle et al, who measured the off axis profiles and depth doses for IR machines. This can maybe give you insight to what factor to apply to a point 2.5cm outside of the field relative to the central axis dose 

Titled: 
Technical note: characterization of x-ray beam profiles for a fluoroscopic system incorporating copper filtration 

Thank you,
Daniel Vergara

> On Jun 3, 2025, at 9:43 AM, Gretchen Raterman Bell via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:
> 
> 
> Salutations!
> 
> I am currently working on a fetal dose estimation for an IR neph tube procedure where the docs did a great job of keeping the fetus out of the FOV.  But when looking at a past radiograph with the tubes in place (yes, this is a multi-step fetal dose calc), it appears that the fetal anatomy would have to be right outside the FOV for the IR procedure.  Currently, my only reference would be Wagner, Fig. A-6, which caps out at 2.5 cm for the closest approach of the rad field.  While I do a literature search, I figured I'd ask the gurus here if anyone happens to have a more modern paper for out of field fetal dose calcs?  One that perhaps addresses ~ 1 cm or less outside FOV?
> 
> Thank you, thank you, thank you, to anyone who has said  paper.
> Gretchen R. Bell, M.S., DABR
> Diagnostic Imaging Physicist
> Ochsner Medical Center
> (504)842-8506
> 
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