[Intl_DxMedPhys] EXT MSG ACR CT Pediatric Clinical Image Question

Tue Apr 1 16:35:59 EDT 2025

The ACR has a pass/fail limit of 10mGy (32cm phantom) that applies  to 40-50lb patients, but there is no limit listed for clinical exams on larger patients (Technique Parameters and Anatomic Coverage: CT - Pediatric Abdomen Module (Revised 12-21-2021) : Accreditation Support<https://urldefense.com/v3/__https://accreditationsupport.acr.org/support/solutions/articles/11000049642-technique-parameters-and-anatomic-coverage-ct-pediatric-abdomen-module-revised-12-21-2021-__;!!KGKeukY!zv9cCpr-T2jYtsr4tMBua_SsApQGWgx-pcG0ETxyi0UHpdCGnrD6tsWAw1W-M8AgWjQ1t7Lp4iO3WtjBm_gLU1_OU7F-6oHFsssBKBCzrOTjog$ >).

However, the same page states “The facility will not receive a pass if the radiation dose is perceived to be too high”  (emphasis is mine).

Phantom testing is more explicit (Radiation Dosimetry: CT (Revised 3-25-2024) : Accreditation Support<https://urldefense.com/v3/__https://accreditationsupport.acr.org/support/solutions/articles/11000056198-radiation-dosimetry-ct-revised-3-25-2024-__;!!KGKeukY!zv9cCpr-T2jYtsr4tMBua_SsApQGWgx-pcG0ETxyi0UHpdCGnrD6tsWAw1W-M8AgWjQ1t7Lp4iO3WtjBm_gLU1_OU7F-6oHFsssBKBDz8yoQXw$ > ).  The tube current should be what you would use on a 40-50lb patient (and by extension the rotation time and helical pitch) in the site scanning form, which must match both the IQ and the dosimetry acquisitions.  The pass/fail limit is again 10mGy (32cm).

---
David M. Gauntt, Ph.D.
Associate Professor
Division of Physics and Engineering
Department of Radiology
(205)975-3777

[1647458080270]

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From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu> on behalf of Johnson, Loretta M via Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Sent: Tuesday, April 1, 2025 2:31 PM
To: Timmerman,Michael; intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: Re: [Intl_DxMedPhys] EXT MSG ACR CT Pediatric Clinical Image Question

I don’t think there’s a pass/fail criterion, but you can look in the in the Radiology 2021 article on diagnostic reference levels by Kanal, et al. Here are the larger groups they have: 5 to < 10 years old 10 to < 15 15 to 18 Also available
I don’t think there’s a pass/fail criterion, but you can look in the in the Radiology 2021 article on diagnostic reference levels by Kanal, et al.  Here are the larger groups they have:

5 to < 10 years old
10 to < 15
15 to 18
Also available by effective diameter in a variety of pediatric sizes.

Peace,
Loretta

Loretta Johnson, Ph.D., DABR, FAAPM | Assistant Professor
Director | Division of Physics and Engineering
Department of Radiology | Heersink School of Medicine
UAB | The University of Alabama at Birmingham
GSB 301 | 619 19th Street South | Birmingham, AL 35249
P: 205.934.7592 | lorettajohnson at uabmc.edu<mailto:lorettajohnson at uabmc.edu>
Pronouns: she, her, hers

From: Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list-bounces+lorettajohnson=uabmc.edu at lists.osu.edu> on behalf of "Timmerman, Michael via Intl_dxmedphys_wd_osu_list" <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Reply-To: "Timmerman,Michael" <Michael.Timmerman at SanfordHealth.org>
Date: Tuesday, April 1, 2025 at 2:07 PM
To: "intl_dxmedphys_wd_osu_list at lists.osu.edu" <intl_dxmedphys_wd_osu_list at lists.osu.edu>
Subject: EXT MSG [Intl_DxMedPhys] ACR CT Pediatric Clinical Image Question

Hi all, It’s been a while since I’ve reviewed clinical images for ACR accreditation. I have a quick question regarding pediatric abdomen pelvis exams. The pass/fail criteria is 10 mGy for the 32 cm phantom but this value is for a
Hi all,

It’s been a while since I’ve reviewed clinical images for ACR accreditation. I have a quick question regarding pediatric abdomen pelvis exams. The pass/fail criteria is 10 mGy for the 32 cm phantom but this value is for a 40-50 lb. patient; are there any guidelines for pass/fail criteria for older (and therefore larger) pediatric patients who may exceed this level?

Thanks!

Best,

Mike
________________________________________
Mike Timmerman, MS, DABR
Diagnostic Medical Physicist
Sanford Health – Sioux Falls Region
Mobile: (541) 213-1075
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