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TOTOKU ELECTRIC CO., LTD.
MQSA Quality Control Manual
3 VIEWING CONDITIONS CHECK AND SETTING
3.1 Objective
To keep and maintain the optimal viewing conditions on Monochrome Monitors for
Mammography
3.2 Frequency
Annually
3.3 Required Equipment
Illuminance Meter
3.4 Procedure
Before the measurement:
• Turn on the display monitors at least 30 minutes (TOTOKU recommends 60
minutes.) before starting the measurement.
• Reduce any lighting coming from other sources such as viewboxes, over head
or task lighting to the minimum and check that the ambient lighting is stable (no
ickering effect due to any of the lighting sources that are turned on).
1. Make each display monitor as dark as possible. (For example, by minimizing the
application windows or displaying a black at eld)
2. Measure the illuminance. (Face the photometer away from the surface of the
display screen during the illuminance measurement.)
3. Check that the measured illuminance value does not exceed 20 lux. (Adjust the
room ambient light and/or the room conguration to maintain the illuminance
value under the limit if it exceeds.)
4. Fill out the display positions, room lights, desk lights, etc. established as optimal
on the form 3 in this manual.
(Note: This data form will be referred by the Radiologic Technologist as optimal
during their daily “VIEWING CONDITIONS CHECK” on the page 8.)
5. Record the ambient light value on the form 3 in this manual.
6. Draw a room layout sufciently accurate on the form in this manual, so that the
Radiologic Technologist can reproduce the illumination conditions established as
optimal during their daily “VIEWING CONDITIONS CHECK”.
7. Post the form in the reading room, so that the Radiologic Technologist can easily
access and refer during their daily “VIEWING CONDITIONS CHECK”.
8. Restore each display to its normal condition, i.e., undo any measures taken in
Step 3.4.1 to darken the display.
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