Cathode Ray Tube Quality Control and Acceptance Testing Program: Initial Results for Clinical PACS Displays

Groth, Debra S.; Bernatz, Scott N.; Fetterly, Kenneth A.; Hangiandreou, Nicholas J.

doi:10.1148/radiographics.21.3.g01ma18719

Cited by 19 publications

(7 citation statements)

References 4 publications

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“…Our monitor life span rates were compared with results reported from Groth et al 10 The average lifetime of failed CRTs documented in Groth et al was 13 8 months for 1K CRTs and 24 12 months for 2K CRTs. The lifetime for both 1K and 2K CRTs was 48 months, compared to our 60 months.…”

Section: Resultsmentioning

confidence: 72%

SoftCopy Display Quality Assurance Program at Texas Children's Hospital

2002

Journal of Digital Imaging

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With growing dependence on picture archiving and communication systems for viewing images, a quality assurance program to monitor the condition of workstation displays has become increasingly important. At present there is no universally accepted program for PACS, but there are groups such as DICOM Working Group 11 of the ACR-NEMA and AAPM Task Group 18 that are working on image quality guidelines for interpretation from soft-copy displays. Texas Children's Hospital (TCH) is developing our own quality assurance program. Data is being collected to determine the appropriate frequency of calibration, the useful life of the displays, appropriate manufacturers, and model-dependent limits on maximum and minimum luminance (black level), symptoms of degradation, and monitor cleanliness. Our system includes a variety of monitors manufactured by Sun, AFP, Siemens, Image Systems, Barco, and Orwin. We are presently collecting data on individual monitor luminance functions but have not yet initiated service calls based on deviation from the DICOM Part 14 Grayscale Display Function (GSDF). The GSDF was intended to produce a grayscale in which driving levels produce changes in luminance that are perceptually equivalent throughout the entire luminance range for a specific test target. Our data is based on measurements of luminance from a digital Society of Motion Picture and Television Engineers (SMPTE) test pattern, which is a standard used by many other institutions. TCH's biomedical engineer measures luminance data each month from the display of the SMPTE pattern and record the results in a spreadsheet. The engineer also makes subjective evaluations of sharpness, geometric distortion, and artifacts. When a monitor's luminance falls outside of arbitrary 10% limits of maximum or minimum luminance, then a service call is placed to the vendor. The luminance check by the biomedical engineer is used to verify both routine and unscheduled calibrations. In addition to the monthly monitor checks, the vendor calibrates the monitor every three months. The vendor checks the following: width and height of display, focus and position of image, SMPTE test pattern, and a graph of the GSDF Index produced by an automatic calibration software by the video driver card. Monitors are also cleaned occasionally for dust, fingerprints, ink, and pencil marks, which accumulate with routine use. This paper reports data collected to date on luminance drift, as well as conclusions on appropriate frequency of test and calibration, and our experience with monitor useful life.

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Section: Resultsmentioning

confidence: 72%

SoftCopy Display Quality Assurance Program at Texas Children's Hospital

2002

Journal of Digital Imaging

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“…The quality control limit which requires display recalibration is 0.006 for inter-display MRD is displayed in Fig. 3 and all inter-display MRD values lie below this control limit (the threshold of visible color difference is between 0.004 and 0.006 [2]). …”

Section: Resultsmentioning

confidence: 99%

“…The lack of published data on the color aging of displays hampers the development of evidence-based QC guidelines. Previous studies have quantified the threshold color difference that is detectable between displays, a quantity that can be used to color match pairs of displays at acceptance testing [2]. However, not enough is known about chromatic changes of aging color LCDs to guide if or how a QC program is needed to maintain color matching and uniformity.…”

Section: Introductionmentioning

confidence: 99%

Aging and Quality Control of Color LCDs for Radiologic Imaging

et al. 2010

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Our practice has long been concerned with the effects of display quality, including color accuracy and matching among paired color displays. Three years of data have been collected on the historical behavior of color stability on our clinical displays. This has permitted an analysis of the color-aging behavior of those displays over that time. The results of that analysis show that all displays tend to yellow over time, but that they do so together. That is, neither the intra-nor inter-display color variances observed at initial deployment diverge over time as measured by a mean radial distance metric in color space (Commission Internationale d'Eclairage L', u', v' 1976). The consequence of this result is that color displays that are matched at deployment tend to remain matched over their lifetime even as they collectively yellow.

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“…The quality of an image displayed on a cathode ray tube (CRT) monitor is influenced by various factors [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…Because the luminance of a CRT monitor will be lower and lower as time passes due to age-related deterioration [2,4,6,8], the luminance of a CRT monitor will be one of the most common image quality problems.…”

Section: Introductionmentioning

confidence: 99%