[Intl_DxMedPhys] [EXTERNAL] Re: Barco 32 MP mammo monitor

[Glen Naekel]

Thank you Albert,

That is very helpful !


From: Xthona, Albert <albert.xthona at barco.com>
Sent: Thursday, May 1, 2025 8:11 PM
To: Glen Naekel <Glen.Naekel at lvhn.org>; Alisa Walz-Flannigan <walzflanniga at wisc.edu>; Jerry Thomas <jerry.thomas at ascension.org>; Douglas Pfeiffer <xraydoug at me.com>
Cc: intl_dxmedphys_wd_osu_list at lists.osu.edu
Subject: RE: [Intl_DxMedPhys] [EXTERNAL] Re: Barco 32 MP mammo monitor

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Hello Glen,

My thought is that you have this about right.  Short version :  The typically darker images on the brighter mammography screen match the typically brighter images on the darker 3MP.

You refer to fatigue due to switching, and in particular the adaptation that may be required of the eye.  This has long been recognized; in Digital Mammography Image Quality, JACR 2006, Siegel et al. write about printed mammography films
The average ambient light conditions should match as closely as possible
the average luminance of the displayed images (properly masked).
for the reason that if the eye is roaming over the film and over the background, it would be best it did not need to try to adapt as it goes back and forth.  Similarly, the eye has to adapt when gazing at mammography images on the Coronis Uniti (MDMC-12133) and then gazing at general radiology images on the Nio 3MP (MDNC-3421).  While the average luminance of the two displays is different, by a factor of two, the average luminance of the images is much closer.  Chest images have an average luminance of 20%, this is why calibration is typically performed with a surround of 20% as described NEMA Standards Publication PS 3.14 Digital Imaging and Communications in Medicine(DICOM), Part14: Grayscale Standard Display Function, NEMA.  But mammography images are much darker.  This used to be 4-5% but has been increased somewhat as people started preparing breast tomosynthesis images for cine viewing.  In the end, the average luminance of one display with its images is quite similar to the luminance of the other.

The displays can also be set to automatically dim somewhat when the cursor, and presumably the radiologist's attention, are on another display.  I'm not sure you need that for this situation, but it (DimView) is an available tool that is used when the ancillary displays have content with a very high average luminance.

Regards,
Albert


From: Glen Naekel <Glen.Naekel at lvhn.org<mailto:Glen.Naekel at lvhn.org>>
Sent: Thursday, 1 May, 2025 13:08
To: Xthona, Albert <albert.xthona at barco.com<mailto:albert.xthona at barco.com>>; Alisa Walz-Flannigan <walzflanniga at wisc.edu<mailto:walzflanniga at wisc.edu>>; Jerry Thomas <jerry.thomas at ascension.org<mailto:jerry.thomas at ascension.org>>; Douglas Pfeiffer <xraydoug at me.com<mailto:xraydoug at me.com>>
Cc: intl_dxmedphys_wd_osu_list at lists.osu.edu<mailto:intl_dxmedphys_wd_osu_list at lists.osu.edu>
Subject: RE: [Intl_DxMedPhys] [EXTERNAL] Re: Barco 32 MP mammo monitor

I have a somewhat related question and would appreciate any feedback.

We have several mammography workstations configured with Unity monitors as well as two MDNC-3421 monitors for viewing other modalities. The Unity monitors can be set to a max luminance of 1000 cd/m2 while the 3421's are usually set at 450.

Considering allowable ambient light level as it relates to monitor luminance and reader eye fatigue switching between the monitor sets, are there any recommendations for how all of these levels should be set?

I can appreciate that there may be improvement in detectability using a higher luminance for mammo, but if two different types of monitors are used in conjunction is there a possibility of increasing eye fatigue?

Thanks in advance,

Glen.



Glen E. Naekel, M.S., D.A.B.R.
Medical Physicist
Department of Radiation Safety and Imaging Physics
Lehigh Valley Health Network
2100 Mack Boulevard
Allentown, PA 18103
Phone: (484) 224-1623

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