Performance of primary diagnostic monitors (PDMs) over time
Andres E Ruuge1, Yiming Gao1, Yusuf E Erdi1
1Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY, USA.
Journal of Applied Clinical Medical Physics
|December 14, 2019
Summary
Primary display luminance in radiology settings showed varied changes over two years, with some increasing unexpectedly. This suggests a need for more frequent quality assurance testing than annual checks.
Area of Science:
- Medical Imaging
- Radiology Technology
- Display Quality Assurance
Background:
- Primary displays in radiology are critical for accurate image interpretation.
- Regular quality assurance (QA) is essential to maintain display performance.
- Monitor luminance is a key characteristic affecting diagnostic image quality.
Purpose of the Study:
- To evaluate changes in primary monitor characteristics over two consecutive years.
- To assess the performance stability of radiology displays.
- To determine if annual QA is sufficient for monitoring display changes.
Main Methods:
- Sixty-six primary radiology monitors were analyzed over two years.
- Luminance values were measured using built-in photometers and an external RaySafe Solo Light meter.
- Performance was evaluated using TG18LN1-18 and TG18UNL80 test patterns.
Main Results:
- 25 displays showed stable luminance, 17 decreased, and 24 increased luminance between 2016 and 2017.
- Most Mean Luminance Deviation (MLD) values were below 17.2%, but 41 displays showed increased MLD in 2017.
- Mean illuminance increased from 5.8 lux in 2016 to 8.7 lux in 2017.
Conclusions:
- Contrary to expectations, some monitors exhibited increased luminance, possibly due to frequent calibrations.
- Annual display QA may not be frequent enough to capture significant performance changes.
- More efficient QA programs with shorter intervals are recommended for radiology displays.
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