[Intl_DxMedPhys] Mammography Display QC

Wed Apr 23 11:11:01 EDT 2025

Hi Dan,

Thanks for your response. I have just had a look at the ACR manual.
[cid:image004.png at 01DBB46A.4BBA1160]

We would easily achieve the <20% tolerance on the centre luminance value here.
However, the EU/UK guidelines specify <5% on the maximum luminance value which is much more difficult…and I can’t see where this constraint might have come from and whether it is appropriate.

The radiologists prefer the large format displays and they definitely provide for a neater workspace.

Niall

From: Januseski, Daniel <DJANUSESKI at virtua.org>
Sent: 23 April 2025 15:44
To: Niall Phelan <Niall.Phelan at screeningservice.ie>; intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: RE: Mammography Display QC

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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<mailto:intl_dxmedphys_wd_osu_list-bounces+djanuseski=virtua.org at lists.osu.edu>> On Behalf Of Niall Phelan via Intl_dxmedphys_wd_osu_list
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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
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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 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:
[cid:image005.png at 01DBB46A.4BBA1160]

UK:
[cid:image006.png at 01DBB46A.4BBA1160]

Grateful to hear any thoughts on this,

Niall

Niall Phelan
Chief Physicist
BreastCheck | 36 Eccles Street | Dublin 7 | DO7 Y7C6

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