RadiAnt DICOM Viewer - Discussion Forum
EIZO Monitor DICOM Mode

Hello,

Many EIZO monitors have a special picture mode for viewing DICOM images. A special tone response curve, the DICOM Grayscale Standard Display Function, is applied which is different to the default sRGB/2.2 gamma curve that most PC monitors use. Also, the white point color temperature is shifted to 7500 and brightness is locked at a higher value on purpose.

Does Radiant DICOM Viewer apply any form of gamma correction to the DICOM images that could conflict with the DICOM mode on such displays? Are there any suggested settings?

Thanks in advance!


Apr 28, 2017 12:25 AM
by Panos Dadamis
Hi,

RadiAnt does not apply any gamma correction to the images it displays. Only default LUTs are used.

Kind regards,
Maciej


May 3, 2017 09:50 PM
by RadiAnt
we have an EIZO monitor too in the mammography reading room.

the radiologists who work there said they noticed a diffent grayscale color display comparing the same images loaded in RadiAnt and in the syngoPlaza Siemens software on the same console and the same monitor.

do you think this could be due to differences in LUT applied by the syngoPlaza software?


May 8, 2017 09:06 AM
by Tommy
Tommy,

There could be several reasons for it: Siemens software may output 10-bit grayscale images (RadiAnt only produces 8-bit output), a presentation states may be present for those MG images (there is no support for PS in RadiAnt), or there is some gamma correction applied in syngoPlaza.


May 9, 2017 04:35 PM
by RadiAnt
interesting. I'll ping Siemens to check the 10-bit thing.
what's the benefit of a 10-bit display vs. an 8-bit display?

regarding the "presentation states" what is it exactly?
it's the same thing of LUT of something different?


May 10, 2017 07:14 AM
by Tommy
With 10 bits you get 1024 shades of gray, whereas 8 bits gives you 256 gray levels.

"A Presentation State is an independent DICOM SOP Instance that contains information on how a particular image should be displayed. The Presentation State may contain label information(types of Label and Positions), windowing values, zoom value, scrolling (panning) values, rotations or any other visual display element that is defined within the DICOM standard."


May 10, 2017 09:57 PM
by RadiAnt
I think the human eye can only see 30 - 40 shades of grey.. so 6 bits would actually be more than enough.. what is the advantage of the 10 bit coding?


May 10, 2017 10:31 PM
by aaaaaaaaa
"Human observers are able to discriminate between 700 and 900 simultaneous shades of gray for the available luminance range of current medical displays and in optimal conditions. Therefore, it has no use to simultaneously display more than 10 bits of gray (1,024 gray shades) because this already exceeds the capabilities of the human visual system. To be able to perceive these 900 simultaneous shades of gray, calibration of medical display systems has shown to be extremely important. Accurate calibration requires approximately 11 bits of inherent display grayscale resolution."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3043920/


May 11, 2017 11:47 AM
by RadiAnt
interesting.

which is the correct standard to display medical images, 8-bit or 10-bit?

is there any plan to allow RadiAnt to display 10-bit images?

why 8-bit output has been choosen?


May 13, 2017 09:41 AM
by Tommy
Usually in diagnostic software 10-bit is required for reporting digital radiography and mammography. 8-bit is sufficient for other modalities.
Displaying 10-bits requires special monitors, special graphic cards, and software specifically designed to handle 10 bits per color channel.
My safe bet is that less than 0.01% of RadiAnt users own such hardware. So currently it doesn't make economic sense to implement it, when there's lots of features that majority of our users crave for waiting to be implemented.


May 13, 2017 11:05 AM
by RadiAnt
ok, thanks for claryfing.


May 14, 2017 09:40 AM
by Tommy
Please... implement 10-bit output!!!


Jun 23, 2017 07:06 PM
by Guest
as the developers said, actually this 10-bit enhancement is not at the top of priority list for new features. maybe in the future...


Jun 24, 2017 08:51 AM
by Tommy
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