[Intl_DxMedPhys] Mammography Display QC

Wed Apr 23 10:46:31 EDT 2025

32 MP is way newer!

James A. Tomlinson, M.S., FACR

On Wed, Apr 23, 2025, 10:45 AM Januseski, Daniel via
Intl_dxmedphys_wd_osu_list <intl_dxmedphys_wd_osu_list at lists.osu.edu> wrote:

> This message was sent securely using Zix® Hello Niall, Interesting
> question regarding the newer 12MP displays. Here in the U. S. , those of us
> following the ACR Digital Mammography accreditation program and using their
> QC guide have to test
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> Hello Niall,
>
>
>
> Interesting question regarding the newer 12MP displays.  Here in the U.S.,
> those of us following the ACR Digital Mammography accreditation program and
> using their QC guide have to test and maintain a 20% target accuracy at the
> center of paired displays.  So the requirements are 30% per display across
> the full display dimension, and +/- 20% between the 2 displays at the
> center.
>
>
>
> In practice, I have not had any trouble meeting even a 5% matching
> tolerance on our displays; single-display performance is also consistently
> below 10% I think mostly due to uniformity correction algorithms built into
> the controllers.
>
>
>
>
>
> *Dan Januseski, MS, DABR*
>
> *Voorhees, NJ*
>
>
>
>
>
>
>
> *From:* Intl_dxmedphys_wd_osu_list
> <intl_dxmedphys_wd_osu_list-bounces+djanuseski=virtua.org at lists.osu.edu> *On
> Behalf Of *Niall Phelan via Intl_dxmedphys_wd_osu_list
> *Sent:* Wednesday, April 23, 2025 4:09 AM
> *To:* intl_dxmedphys_wd_osu_list at lists.osu.edu
> *Subject:* [EXTERNAL] [Intl_DxMedPhys] Mammography Display QC
>
>
>
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> On the subject of display QC…. . We have for many years employed a
> standard configuration of two 5MP displays side-by-side for mammography
> reporting and perform QC according to European guidelines (EFOMP & UK;
> relevant standards
>
> On the subject of display QC…. . We have for many years employed a
> standard configuration of two 5MP displays side-by-side for mammography
> reporting and perform QC according to European guidelines (EFOMP & UK;
> relevant standards extracted
>
> On the subject of display QC…..
>
>
>
> We have for many years employed a standard configuration of two 5MP
> displays side-by-side for mammography reporting and perform QC according to
> European guidelines (EFOMP & UK; relevant standards extracted in boxes
> below) which in turn are based on AAPM TG-18 and subsequently TG-270.
>
> However, there is one additional constraint on the luminance variation
> between the two displays (<5%) which doesn’t appear to form part of the
> AAPM guidance. I have always felt this constraint makes sense for
> diagnostic reporting with two paired displays, and we have achieved this
> performance in practice for years (sometimes by adjusting the L(max) of
> both displays independently).
>
> Equally, all the guidance documents specify the uniformity tolerance for a
> single display to be <30% but in practice, we typically measure this <10%
> across the entire luminance range.
>
>
>
> Recently, while testing some new large format displays (12MP) which are
> split into two independent windows for side-by-side reporting, we haven’t
> been able to achieve this 5% tolerance on L(max) for what are effectively
> two sides of the same display. In one case, we measure >15% difference and
> of course the L(max) can’t be adjusted as before for two independent
> displays.
>
> Equally, when we consider the large format display on its own or split
> into independent display windows, either configuration conforms to the 30%
> uniformity tolerance.
>
>
>
> Ultimately, the questions are:
>
> Does anyone in North America (or elsewhere) impose a similar constraint on
> paired displays?
>
> Does it make sense to impose a 30% uniformity limit on each single display
> and then a tighter 5% constraint on the paired displays?
>
> Is 30% too high anyway for luminance uniformity (CRTs could achieve this
> 20+ years ago)?
>
>
>
>
>
> *EFOMP:*
>
>
>
> *UK:*
>
>
>
>
>
> Grateful to hear any thoughts on this,
>
>
>
> Niall
>
>
>
>
>
> *Niall Phelan*
>
> *Chief Physicist*
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