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Cathode ray tube quality control and acceptance testing program: initial results for clinical PACS displays
D S Groth1, S N Bernatz, K A Fetterly
1Department of Diagnostic Radiology, Mayo Clinic and Foundation, 200 First St SW, 2-103 Charlton Bldg, Rochester, MN 55905, USA. groth.debra@mayo.edu
Summary
This study details a quality control program for radiology cathode ray tube (CRT) monitors used in Picture Archiving and Communication Systems (PACS). Regular testing ensures consistent image quality and display performance for accurate medical imaging.
Area of Science:
- Radiology
- Medical Imaging Technology
- Display Quality Assurance
Background:
- Picture Archiving and Communication Systems (PACS) are increasingly used for soft-copy interpretation in radiology.
- Cathode Ray Tube (CRT) displays require robust quality control (QC) for reliable diagnostic imaging.
Purpose of the Study:
- To present a comprehensive CRT acceptance test and QC program for PACS environments.
- To establish procedures for maintaining optimal monitor performance over time.
Main Methods:
- Developed and implemented a 5-year CRT QC program involving multiple vendors.
- Procedures included monitor cleanliness, setup, qualitative image assessment, and quantitative luminance/color measurements.
- Utilized photometers and Society of Motion Picture Test Engineers (SMPTE) test images.
Main Results:
- CRT luminance changed over time, requiring quarterly recalibration.
- Phosphor color also changed but allowed for annual measurements.
- Color measurements were crucial for initial setup and monitor replacement.
Conclusions:
- The developed QC program standardizes luminance, matches phosphor color across workstations, and tracks artifacts.
- Implementation of this QC program is essential due to the dynamic nature of CRT displays in PACS.