Nodule detection in digital chest radiography: effect of system noise.

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Fältnamn	Indikatorer	Metadata
000		05224naa a2200673 4500
001		oai:gup.ub.gu.se/58756
003		SwePub
008		240528s2005 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://gup.ub.gu.se/publication/587562 URI
024	7	a https://doi.org/10.1093/rpd/nch5252 DOI
040		a (SwePub)gu
041		a eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Håkansson, Markusu Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics4 aut
245	1 0	a Nodule detection in digital chest radiography: effect of system noise.
264		c 2005-05-17
264	1	b Oxford University Press (OUP),c 2005
520		a 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.
650	7	a MEDICIN OCH HÄLSOVETENSKAPx Klinisk medicinx Radiologi och bildbehandling0 (SwePub)302082 hsv//swe
650	7	a MEDICAL AND HEALTH SCIENCESx Clinical Medicinex Radiology, Nuclear Medicine and Medical Imaging0 (SwePub)302082 hsv//eng
653		a Artifacts
653		a Humans
653		a Image Processing
653		a Computer-Assisted
653		a Lung
653		a pathology
653		a radiography
653		a Lung Neoplasms
653		a diagnosis
653		a radiography
653		a Models
653		a Anatomic
653		a Observer Variation
653		a ROC Curve
653		a Radiographic Image Enhancement
653		a methods
653		a Radiographic Image Interpretation
653		a Computer-Assisted
653		a methods
653		a Radiography
653		a methods
653		a Radiography
653		a Thoracic
653		a methods
653		a Scattering
653		a Radiation
653		a Software
653		a X-Rays
700	1	a Båth, Magnus,d 1974u Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics4 aut0 (Swepub:gu)xbatma
700	1	a Börjesson, Sarau Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics4 aut
700	1	a Kheddache, Susanne,d 1949u Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiologi,Institute of Selected Clinical Sciences, Department of Radiology4 aut0 (Swepub:gu)xkhesu
700	1	a Johnsson, Åse (Allansdotter),d 1966u Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiologi,Institute of Selected Clinical Sciences, Department of Radiology4 aut0 (Swepub:gu)xjohna
700	1	a Månsson, Lars Gunnar,d 1951u Gothenburg University,Göteborgs universitet,Institutionen för särskilda specialiteter, Avdelningen för radiofysik,Institute of Selected Clinical Sciences, Department of Radiation Physics4 aut0 (Swepub:gu)xmanla
710	2	a Göteborgs universitetb Institutionen för särskilda specialiteter, Avdelningen för radiofysik4 org
773	0	t Radiation protection dosimetryd : Oxford University Press (OUP)g 114:1-3, s. 97-101q 114:1-3<97-101x 0144-8420x 1742-3406
856	4 8	u https://gup.ub.gu.se/publication/58756
856	4 8	u https://doi.org/10.1093/rpd/nch525

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