TY - JOUR
T1 - Receiver operating characteristic analysis of fracture and pneumonia detection
T2 - Comparison of laser-digitized workstation images and conventional analog radiographs
AU - Ackerman, Stacey J.
AU - Gitlin, Joseph N.
AU - Gayler, Robert W.
AU - Flagle, Charles D.
AU - Bryan, R. Nicholas
PY - 1993/1
Y1 - 1993/1
N2 - Forty pneumonia and 40 fracture cases were matched by patient age and gender with normal cases. Pediatric cases constituted 25% of this sample. All 160 examinations were laser-digitized at a spot size of 210 μm, a contrast resolution of 12 bits, and a spatial resolution of 2.35 line pairs per millimeter. The digitized images were transmitted 5 miles over a dedicated telephone line at a T1 rate from Francis Scott Key Hospital to Johns Hopkins Hospital (both in Baltimore, Md). At Johns Hopkins Hospital, eight radiologists interpreted the original analog radiograph and corresponding soft-copy display (1,280 × 1,024 pixels). Findings, confidence ratings, and image quality were reported for each reading. A receiver operating characteristic (ROC) analysis was conducted to compare observer performance under the analog and digital reading conditions. The overall sensitivity of the analog method was 89% versus 78% for the digital method (P < .001), while the specificity values were 96% and 92%, respectively (P > .20). ROC analysis similarly indicated a statistically significant difference in favor of analog radiographs (P = .028).
AB - Forty pneumonia and 40 fracture cases were matched by patient age and gender with normal cases. Pediatric cases constituted 25% of this sample. All 160 examinations were laser-digitized at a spot size of 210 μm, a contrast resolution of 12 bits, and a spatial resolution of 2.35 line pairs per millimeter. The digitized images were transmitted 5 miles over a dedicated telephone line at a T1 rate from Francis Scott Key Hospital to Johns Hopkins Hospital (both in Baltimore, Md). At Johns Hopkins Hospital, eight radiologists interpreted the original analog radiograph and corresponding soft-copy display (1,280 × 1,024 pixels). Findings, confidence ratings, and image quality were reported for each reading. A receiver operating characteristic (ROC) analysis was conducted to compare observer performance under the analog and digital reading conditions. The overall sensitivity of the analog method was 89% versus 78% for the digital method (P < .001), while the specificity values were 96% and 92%, respectively (P > .20). ROC analysis similarly indicated a statistically significant difference in favor of analog radiographs (P = .028).
KW - Diagnostic radiology, observer performance
KW - Picture archiving and communication system (PACS)
KW - Receiver operating characteristic curve (ROC)
KW - Video systems
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U2 - 10.1148/radiology.186.1.8416576
DO - 10.1148/radiology.186.1.8416576
M3 - Review article
C2 - 8416576
AN - SCOPUS:0027534053
SN - 0033-8419
VL - 186
SP - 263
EP - 268
JO - RADIOLOGY
JF - RADIOLOGY
IS - 1
ER -