Comparison of Automatic and Manual QC Luminance Measurements in Primary Monitors (PDMs) Over the 2-Year Period
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Purpose: In this work, we compared the luminance measurements performed by an external photometer and PDM’s built-in photometer for the period of two consecutive years.
Methods: Thirty PDMs (Barco, MDCC-6430) which were continuously in service for 2 years (2020-2021), were included in the analysis. Automated and manual luminance measurements were performed on the same day following one another. The monitors were located at radiology physicians' offices and radiology reading rooms. All PDMs were equipped with the manufacturer's built‐in photometers and connected to the BarcoMediCalQA web service for manual and automatic quality control measurements. External photometer (RaySafeSoloLight) was used to measure the luminance values. TG18LN1‐18 and TG18UNL80 test patterns were used to evaluate the primary monitors performance.
Results: For all tested monitors, the average difference of maximum luminance (Lmax) values measured with the built-in photometer and with an external photometer was 28.6 cd/m² in 2020 and 29.1 cd/m² in 2021 with the maximum difference of 54.1 cd/m² in 2020 and 51.7 cd/m² in 2021. The verification of grayscale standard display function (GSDF) calibration, using a built-in photometer on average differed from external photometer by 2.7% in 2020 and 2.2% in 2021 with the maximum difference of 7.9 % in 2020 and 9.9 % in 2021.
Conclusion: In our previous and current publications, it was shown that luminance values measured with the built-in photometer and with an external photometer had the difference up to 54.1 cd/m². The built-in photometer is calibrated only at the time of manufacturing comparing with the bi-annual calibration of external photometer. The difference in luminance measurements increases with time. Tracking the difference of the display’s Lmax values measured by both photometers is an important part of the monitors QA program.
Funding Support, Disclosures, and Conflict of Interest: This research was funded in part through the NIH/NCI Cancer Center Support Grant P30 CA008748
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