| Verification of DICOM GSDF in complex backgrounds. | |
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MedLine Citation:
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PMID: 22535193 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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While previous research has determined the contrast detection threshold in medical images, it has focused on uniform backgrounds, has not used calibrated monitors, or has involved a low number of readers. With complex clinical images, how the Grayscale Standard Display Function (GSDF) affects the detection threshold and whether the median background intensity shift has been minimized by GSDF remains unknown. We set out to determine if the median background affected the detection of a low-contrast object in a clustered lumpy background, which simulated a mammography image, and to define the contrast detection threshold for these complex images. Clustered lumpy background images were created of different median intensities and disks of varying contrasts were inserted. A reader study was performed with 17 readers of varying skill level who scored with a five-point confidence scale whether a disk was present. The results were analyzed using reader operating characteristic (ROC) methodology. Contingency tables were used to determine the contrast detection threshold. No statistically significant difference was seen in the area under the ROC curve across all of the backgrounds. Contrast detection fell below 50 % between +3 and +2 gray levels. Our work supports the conclusion that Digital Imaging and Communications in Medicine GSDF calibrated monitors do perceptually linearize detection performance across shifts in median background intensity. The contrast detection threshold was determined to be +3 gray levels above the background for an object of 1° visual angle. |
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Authors:
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David L Leong; Louise Rainford; Tamara Miner Haygood; Gary J Whitman; Philip M Tchou; William R Geiser; Selin Carkaci; Patrick C Brennan |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Journal of digital imaging Volume: 25 ISSN: 1618-727X ISO Abbreviation: J Digit Imaging Publication Date: 2012 Oct |
Date Detail:
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Created Date: 2012-09-20 Completed Date: 2013-03-07 Revised Date: 2013-03-14 |
Medline Journal Info:
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Nlm Unique ID: 9100529 Medline TA: J Digit Imaging Country: United States |
Other Details:
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Languages: eng Pagination: 662-9 Citation Subset: IM |
Affiliation:
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Analogic Corporation, 8 Centennial Drive, Peabody, MA 01960, USA. dleong@analogic.com |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Area Under Curve Artifacts* Calibration Cohort Studies Confidence Intervals Contrast Sensitivity Data Display* False Positive Reactions Female Humans Liquid Crystals Mammography / methods* ROC Curve Radiographic Image Enhancement / methods* Radiographic Image Interpretation, Computer-Assisted / instrumentation* Radiology Information Systems / standards* Reference Standards |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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