NEC GammaCompMD QA Instrukcja Użytkownika Pobierz pdf (Strona 180)

GammaCompMD QA Client User Manual

 Regular re-adjustment of integrated front sensors or retractable sensors

It is a common physical phenomenon that all light sensors lose their sensitivity over time

when a light source emitting some ultraviolet light is measured permanently. The backlights

of LCD Displays contain some small part of ultraviolet light, causing the plastic cover material

of such a sensor to deteriorate. The sensitivity of the sensor will be reduced over time. This

results in reduced measurement accuracy when performing i.e. a DICOM conformance test.

A Reference Calibration provides a re-adjustment of the front sensor and improves the

measurement accuracy again. In case of displays with integrated front sensors, the new

reference values are stored in the display.

 Recommended time interval for Reference Calibration

 At time of installation and first calibration

 Then regularly every 24 months – in case of a high amount of active usage

hours of the display, shorter time intervals are recommended

 MD215MG (5MP) regularly every 12 months – in case of high active

usage hours of the display, shorter time intervals are recommended

NOTE: In case of models MD212G3, MD215MG, MD211G5 and MD302C6, a Reference

Calibration of the front sensor is performed automatically during calibration with an external

sensor. Therefore the Reference Calibration button, as described in 7.2.6 Sensor Setup(page

77) is disabled for these models.

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NEC GammaCompMD QA Instrukcja Użytkownika Strona 180