Advanced Imaging

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Advanced Imaging Magazine

Updated: January 12th, 2011 09:49 AM CDT

Here Comes Color

Thanks to better illumination, diagnostic monitors are shifting from grayscale to color
NEC Display Solutions America
NEC’s MD 213 comes with digital uniformity correction that reduces screen uniformity errors and compensates for differences in color/grayscale and luminance across the entire screen.
Barco
Barco’s 30-inch Coronis Fusion 6mp delivers a DICOM-calibrated luminance of 800 candela and allows simultaneous reading of color, grayscale and fused modalities.
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By Barry Hochfelder

On the DICOM curve, an image is represented on a scale in incremental values from zero to 1,023, with zero being the darkest and 1,023 the lightest. Each grayscale increment corresponds to an increment in luminance, between 0.05 candela and 4,000 candela, which can just be noticed by the eye. The result is a mapping of levels of luminance versus steps in visual perception. As a result, the DICOM curve describes the specific grayscale output of a display in a defined range of luminance values that are nearly linear in perception.

By allowing the standardization and mapping of the contrast sensitivity to that of the human eye, DICOM calibration assures that a given gray level will appear the same from one display to the next.

“The grayscale monitor is defined by its backlighting,” Swiderski says. “For the money and performance, fluorescent is the leading technology. LEDs are mostly white. RGB is very expensive, [but] white will catch up very shortly.”

NEC’s top of the line monitor is the MD 213 MC. It’s a 3mp high-bright color monitor with 800 candela maximum that comes calibrated to 400. There is a 5-year warranty on the monitor and 30,000 hours on the illumination. The grayscale model has longer life and can add more brightness behind it.

The MD 213’s integrated tri-stimulus (three-color) front sensor receives more light information than standard (brightness only) sensors, making it extremely accurate and stable. It has digital uniformity correction that reduces screen uniformity errors and compensates for differences in color/grayscale and luminance across the entire screen.



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