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Comparative Study
. 2004 Sep;17(3):149-57.
doi: 10.1007/s10278-004-1013-7. Epub 2004 Jun 29.

SCAR R&D Symposium 2003: comparing the efficacy of 5-MP CRT versus 3-MP LCD in the evaluation of interstitial lung disease

Steve Langer  1 , Brian Bartholmai, Ken Fetterly, Scott Harmsen, William Ryan, Brad Erickson, Kathy Andriole, John Carrino
Affiliations
Comparative Study

SCAR R&D Symposium 2003: comparing the efficacy of 5-MP CRT versus 3-MP LCD in the evaluation of interstitial lung disease

Steve Langer et al. J Digit Imaging. 2004 Sep.

Abstract

The efficacy of two medical-grade, self-calibrating, gray scale displays were compared with regard to impact on sensitivity and specificity for the detection of interstitial lung disease (ILD) on computed radiographs (CR). The displays were a 5-megapixel (MP) cathode ray tube (CRT) device and a 3-MP liquid crystal display (LCD). A sample consisting of 230 anteroposterior (AP), posteroanterior (PA), and lateral views of the chest with CT-proven findings characteristic for ILD as well as 80 normal images were compared. This double-blinded trial produced a sample sufficient to detect if the sensitivity of the LCD was 10% or more reduced (one-sided) from the "gold standard" CRT display. Both displays were calibrated to the DICOM gray scale standard and the coefficient of variation of the luminance function varied less than 2% during the study. Five board-certified radiologists specializing in thoracic radiology interpreted the sample on both displays and the intraobserver Az (area under the ROC curve) showed no significant correlation to the display used. In addition, an interobserver kappa analysis showed that the relative disagreement between any observer pair remained relatively constant between displays, and thus was display invariant. This study demonstrated there is no significant change in observer performance sensitivity on 5-MP CRT versus 3-MP LCD displays for CR examinations demonstrating ILD of the chest.

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Figures

Figure 1
Figure 1
A sample of the data collection spreadsheet. Timing information for each image view was collected automatically; the clock started when the study coordinator entered the cell “ROC Score” and stopped as soon as a value was entered and the cell was exited.
Figure 2
Figure 2
Measured gray scale display functions and ideal DICOM Grayscale Standard Display Function (DGSDF) for the 5-MP CRT and 3-MP LCD.
Figure 3
Figure 3
Modulation transfer function of the 5-MP CRT and the 3-MP LCD.
Figure 4
Figure 4
Comparison of the JND/DDL of the CRT and LCD displays versus a histogram constructed by averaging the AP and lateral views of both female and male patients. Note that the LCD enjoys an advantage in all areas of significant image information.
Figure 5
Figure 5
A representative plot of the 3-MP LCD ROC curve against that for the 5-MP CRT for a single observer.
See this image and copyright information in PMC

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