| Visual increment and decrement threshold curves as a function of luminance range and noise in simulated computed tomographic scans. | |
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MedLine Citation:
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PMID: 1428737 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES: The effect of luminance range compression on the visual threshold of a target in a computed tomographic (CT) scan was investigated in eight experiments. METHODS: Both visual increment thresholds of a hot target and visual decrement thresholds of a cold target were obtained. Realistic noisy CT images simulating a scan reconstruction and partial volume blurring were tested as representative of complex medical images. Negative versions, high luminance versions, and noise-free versions of these CT images also were tested. RESULTS AND CONCLUSIONS: In all the noisy images, as the luminance range of the image was compressed, proportionately smaller physical luminance differences between the target and its local background were needed to reach visual threshold. However, the thresholds were the same in terms of the difference in CT numbers between target and background. Noise in terms of CT numbers sets the threshold for a wide range of display conditions. In the noise-free CTs, as the luminance range was compressed, the luminance differences between the target and background needed to reach threshold also decreased, but only marginally. However, in terms of CT numbers, the thresholds were increased. |
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Authors:
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V Klymenko; R E Johnston; S M Pizer |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: Investigative radiology Volume: 27 ISSN: 0020-9996 ISO Abbreviation: Invest Radiol Publication Date: 1992 Aug |
Date Detail:
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Created Date: 1992-12-17 Completed Date: 1992-12-17 Revised Date: 2010-03-24 |
Medline Journal Info:
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Nlm Unique ID: 0045377 Medline TA: Invest Radiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 598-604 Citation Subset: IM |
Affiliation:
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Department Computer Science, University of North Carolina at Chapel Hill. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Computer Simulation* Computer Terminals Feedback Humans Light Noise Radiographic Image Enhancement / instrumentation, methods* Tomography, X-Ray Computed / instrumentation, methods*, statistics & numerical data |
| Grant Support | |
ID/Acronym/Agency:
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P01-CA-47982/CA/NCI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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