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Nodule detection in...
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Håkansson, MarkusGothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics
(author)
Nodule detection in digital chest radiography: effect of system noise.
- Article/chapterEnglish2005
Publisher, publication year, extent ...
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2005-05-17
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Oxford University Press (OUP),2005
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LIBRIS-ID:oai:gup.ub.gu.se/58756
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https://gup.ub.gu.se/publication/58756URI
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https://doi.org/10.1093/rpd/nch525DOI
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Apart from the image content that is the reproduction of anatomy and possible lesions, an X-ray image also contains system noise due to the limited number of photons and other internal noise sources in the system (image plate artefacts, electronic noise, etc.). The aim of this study was to determine the extent to which the system noise influences the detection of subtle lung nodules in five different regions of the chest. This was done by conducting a receiver operating characteristic (ROC) study with five observers on two different sets of images; clinical chest X-ray images and images of a LucAl phantom at similar dose levels found in the different regions of the chest. In both image types, mathematically simulated nodules (with a full-width-at-fifth-maximum of 10 mm) were added to the images at varying contrast levels. As a measure of the influence of system noise on the detection of subtle lung nodules, the ratio between the contrast needed to obtain an area under the ROC curve of 0.80 in the system noise images to that needed in the clinical images was used. The contrast ratio between system noise images and clinical images ranged from approximately 0.02 (in the hilar region) to 0.18 (in the lower mediastinal region). The maximum difference in contrast needed for the corresponding system noise images, collected at the lowest and the highest dose represented in the anatomical image, was a factor of 2. These results indicate that probably no region in a chest X-ray image is limited by the number of quanta to the detector for the detection of 10 mm lung nodules when a radiation dose corresponding to a system with speed class 200 (leading to a detector dose of approximately 9 muGy behind the parenchyma) is used.
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Båth, Magnus,1974Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics(Swepub:gu)xbatma
(author)
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Börjesson, SaraGothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics
(author)
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Kheddache, Susanne,1949Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiologi,Institute of Selected Clinical Sciences, Department of Radiology(Swepub:gu)xkhesu
(author)
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Johnsson, Åse (Allansdotter),1966Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiologi,Institute of Selected Clinical Sciences, Department of Radiology(Swepub:gu)xjohna
(author)
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Månsson, Lars Gunnar,1951Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics(Swepub:gu)xmanla
(author)
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Göteborgs universitetInstitutionen för särskilda specialiteter, Avdelningen för radiofysik
(creator_code:org_t)
Related titles
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In:Radiation protection dosimetry: Oxford University Press (OUP)114:1-3, s. 97-1010144-84201742-3406
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