[Intl_DxMedPhys] ACR MRI Philips Prescribed Phase FOV Question

[Steven Shea]

I would second Leah's message -- fill out the numbers such that the proper
in-plane resolution is calculated. This is a matter of semantics. On
Siemens systems, the parameters is FOV oversampling % and on GE it is NAcq.
On both of those systems, you can see the acquired phase-encode lines
before the oversampling is prescribed, so we use that plus the
reconstructed FOV. Is it the true number of phase-encoding steps acquired?
No. But neither are the frequency-encoding steps nor the acquired frequency
FOV. While I would be in favor of a better way to capture these nuances,
technologists might get tripped up trying to extract this level of detail.
(I believe the majority of sites have technologists doing this work and
cannot count on physicists.) If you get dinged, step in and appeal. I have
found a direct correspondence with an ACR physicist (which only happens
after an appeal) resolves these matters quickly.

Best regards, Steve

Steven Shea, PhD
Associate Professor, MR Scientist
Department of Radiology & Medical Imaging. Loyola Medicine


On Fri, Jul 3, 2026 at 7:57 AM Henze Bancroft, Leah C via
Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

> Hello, I have run into similar issues with some of our ACR MR submissions.
> I don't have a Philips system so was working with different parameters but
> took the same approach you propose - fill out the form so the proper
> in-plane resolution was
> Hello,
>
> I have run into similar issues with some of our ACR MR submissions.  I
> don't have a Philips system so was working with different parameters but
> took the same approach you propose - fill out the form so the proper
> in-plane resolution was calculated at the end of the form.  The submission
> was accepted for ACR accreditation without issue.
>
> Hope that helps,
>
> Leah
>
>
>
>
> *Leah Henze Bancroft, PhD *
> *She/her/hers *Assistant Professor
> Department of Radiology
> University of Wisconsin-Madison
> School of Medicine and Public Health
> Office: 1311 WIMR
> Phone: (608) 265-9018
>
>
>
>
> ------------------------------
> *From:* Intl_dxmedphys_wd_osu_list <
> intl_dxmedphys_wd_osu_list-bounces at lists.osu.edu> on behalf of Meier,
> Joseph via Intl_dxmedphys_wd_osu_list <
> intl_dxmedphys_wd_osu_list at lists.osu.edu>
> *Sent:* Thursday, July 2, 2026 4:24 PM
> *To:* DxMedPhys List <intl_dxmedphys_wd_osu_list at lists.osu.edu> <
> intl_dxmedphys_wd_osu_list at lists.osu.edu>; Brady, Samuel <
> Samuel.Brady at cchmc.org>
> *Subject:* [Intl_DxMedPhys] ACR MRI Philips Prescribed Phase FOV Question
>
>
> WARNING: This email appears to have originated outside of the UW Health
> email system.
> DO NOT CLICK on links or attachments unless you recognize the sender and
> know the content is safe.
> Hello, For ACR MRI submission, our Philips body/spine images have a
> prescribed FoV in the phase direction that is larger than the reconstructed
> phase FoV. (e. g. , percent phase FoV is 175) to prevent aliasing. Since
> the ACR form calculates the
>
> Hello,
>
> For ACR MRI submission, our Philips body/spine images have a prescribed
> FoV in the phase direction that is larger than the reconstructed phase FoV.
> (e.g., percent phase FoV is 175) to prevent aliasing.
>
> Since the ACR form calculates the in plane resolution, I assume we should
> enter in the Reconstructed Phase and frequency FoVs for our submission as
> follows:
>
>
>
> Freq FoV = 280
>
> Prescribed Phase FoV = 490
>
> Percent Phase FoV = 175
>
> Phase FoV to be entered on the ACR data sheet should be 280 e.g., 490/1.75
> = 280
>
> Thank you for your insight,
>
> Joe Meier
>
>
>
> Joseph Meier, PhD
>
> Diagnostic Imaging Medical Physicist, Cincinnati Children’s Hospital
>
> Assistant Professor, University of Cincinnati
>
> 3333 Burnet Ave, MLC 5031
>
> Cincinnati, OH 45229-3026
>
> (713) 422-3597 (O)
>
> (513) 636-7775 (Administrative Assistant)
>
>
>
>
>
>
>
>
>
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