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Nodule detection in digital chest radiography: Effect of nodule location
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2005 (English)In: Radiation Protection Dosimetry, ISSN 0144-8420, Vol. 114, no 1-3, 92-96 p.Article in journal (Refereed) Published
Abstract [en]

Most detection studies in chest radiography treat the entire chest image as a single background or divided into the two regions parenchyma and mediastinum. However, the different parts of the lung show great variations in attenuation and structure, leading to different amounts of quantum noise and scattered radiation as well as different complexity. Detailed data on the difference in detectability in the different regions are of importance. The purpose of this study was to quantify the difference in detectability between different regions of a chest image. The chest X ray was divided into six different regions, where each region was considered to be uniform in terms of detectability. Thirty clinical chest images were collected and divided into the different regions. Simulated designer nodules with a full-width-at-fifth-maximum of 10 mm but with varying contrast were added to the images. An equal number of images lacking pathology were included and a receiver operating characteristic (ROC) study was conducted with five observers. Results show that the image contrast needed to obtain a constant value of Az (area under an ROC curve) differs by more than a factor of four between different regions. © The Author 2005. Published by Oxford University Press. All rights reserved.

Place, publisher, year, edition, pages
2005. Vol. 114, no 1-3, 92-96 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-28490DOI: 10.1093/rpd/nch524Local ID: 13638OAI: diva2:249300
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2011-01-12

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Ullman, Gustaf
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Faculty of Health SciencesRadiation Physics
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