Document Detail


ROC study of four LCD displays under typical medical center lighting conditions.
MedLine Citation:
PMID:  16249836     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Nine observers reviewed a previously assembled library of 320 chest computed radiography (CR) images. Observers participated in four sessions, reading a different 1/4 of the sample on each of four liquid crystal displays: a 2-megapixel (MP) consumer color display, a 2-MP business color display, a 2-MP medical-grade gray display, and a 3-MP gray display. Each display was calibrated according to the DICOM Part 14 standard. The viewing application required observer log-in, then randomized the order of the subsample seen on the display, and timed the responses of the observer to render a 1-5 judgment on the absence or presence of ILD on chest CRs. Selections of 1-2 were considered negative, 3 was indeterminate, and 4-5 were positive. The order of viewing sessions was also randomized for each observer. The experiment was conducted under controlled lighting, temperature, and sound conditions to mimic conditions typically found in a patient examination room. Lighting was indirect, and illuminance at the display face was 195 +/- 8% lux and was monitored over the course of the experiment. The average observer sensitivity for the 2 MP color consumer, 2 MP business color, 2 MP gray, and 3 MP gray displays were 83.7%, 84.1%, 85.5%, and 86.7%, respectively. The only pairwise significant difference was between the 2-MP consumer color and the 2-MP gray (P = 0.05). Effect of order within a session was not significant (P = 0.21): period 1 (84.3%), period 2 (86.2%), period 3 (85.4%), period 4 (84.1%). Observer specificity for the various displays was not statistically significant (P = 0.21). Finally, a timing analysis showed no significant difference between the displays for the user group (P = 0.13), ranging from 5.3 s (2 MP color business) to 5.9 s (3 MP Gray). There was, however, a reduction in time over the study that was significant (P < 0.001) for all users; the group average decreased from 6.5 to 4.7 s per image. Physical measurements of the resolution, contrast, and noise properties of the displays were acquired. Most notably, the noise of the displays varied by 3.5x between the lowest and highest noise displays. Differences in display noise were indicative of observer performance. However, the large difference in the magnitude of the noise was not predictive of the small difference (3%) in the observer sensitivity for various displays. This is likely because detection of interstitial lung disease is limited by "anatomical noise" rather than display or x-ray image noise.
Authors:
Steve Langer; Ken Fetterly; Jay Mandrekar; Scott Harmsen; Brian Bartholmai; Charles Patton; Alan Bishop; Colin McCannel
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Publication Detail:
Type:  Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of digital imaging     Volume:  19     ISSN:  0897-1889     ISO Abbreviation:  J Digit Imaging     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-10     Completed Date:  2006-09-01     Revised Date:  2013-03-14    
Medline Journal Info:
Nlm Unique ID:  9100529     Medline TA:  J Digit Imaging     Country:  United States    
Other Details:
Languages:  eng     Pagination:  30-40     Citation Subset:  IM    
Affiliation:
Mayo Clinic and Foundation, Department of Radiology, 200 First Street SW, Rochester, MN 55905, USA. langer.steve@mayo.edu
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MeSH Terms
Descriptor/Qualifier:
Artifacts
Data Display*
Humans
Lighting*
Lung Diseases / radiography*
Observer Variation
ROC Curve*
Radiographic Image Enhancement*
Radiography, Thoracic
Radiology Department, Hospital
User-Computer Interface
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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