[Intl_DxMedPhys] Out of Field Fetal Dose Calculations

[Li, Baojun]

I had to think that, if the fetus is that close to the edge of the FOV, it's likely at least partially within it. Also, there is the option to interpolate between the in-field dose (Fig. A-13) and the out-of-field dose (Fig. A-6). Although Wagner’s data are not continuous, the dose distribution should be.

Baojun


From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu<mailto:intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu>> On Behalf Of Gretchen Raterman Bell via Intl_dxmedphys_wd_osu_list
Sent: Tuesday, June 3, 2025 12:43 PM
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Subject: [Intl_DxMedPhys] Out of Field Fetal Dose Calculations

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
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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