Calibration is the most important factor in accurate and consistent image display. Every monitor, regardless of manufacturer, deteriorates over time and has varying display characteristics.
There are a number of reasons why LCD displays need to be initially calibrated or re-calibrated:
- to change the natural non-linear nature of the displays performance into a perceptually linear range of grey tones, to enhance diagnostic value, in accordance with the DICOM Part 14 standard
- changes have been made to the display configuration or environment such as increased optimum brightness level or ambient light
- to enable matching of displays in a multiple head configuration or copying of display configuration in order to provide consistent image across all displays
- to compensate for the displays natural degradation in performance over time, such as reduced maximum brightness or shift in white colour (affects displays even with brightness stabilisation)
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How do you calibrate a LCD display ?
A calibration sensor is used to read luminance values from set positions on the display at set intensity levels under the guidance of the calibration software. Corrections for the individual display are made and stored in the displays internal Look-Up table (not available in conventional LCD for IT applications).
Some display vendors offer the ability to check conformance and calibration remotely using a remotely controlled calibration sensor. This can significantly reduce the life time costs of maintaining diagnostic displays in the field.
How often do I need to re-calibrate?
This will be determined by any national regulations/local policy and forms part of the Quality Control procedures.
Calibration of NEC MD and MDview Series Products
Calibration of NEC Medical displays is performed by NEC’s GammaCompMD software and allows you to:
- ensure DICOM Part 14 conformance and therefore optimise image quality for that display for the life of the display
- simulate the traditional use of Blue or Clear film on the display
- uniquely calibrate and maintain the white-point for the life of the product (MD21GS-2MP and MD21GS-3MP)
- copy the display performance of one display to another to provide a consistent image across all displays within the department, hospital or across multiple sites maintains calibration locally or remotely via GammaCompMD Administrator
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