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dc.contributor.authorSandborg, Men_US
dc.contributor.authorMcVey, Gen_US
dc.contributor.authorDance, DRen_US
dc.contributor.authorCarlsson, GAen_US
dc.identifier.citationMEDICAL PHYSICS, 2001, 28 pp. 2007 - 2019en_US
dc.description.abstractA computer program has been developed to model chest radiography. It incorporates a voxel phantom of an adult and includes antiscatter grid, radiographic screen, and film. Image quality is quantified by calculating the contrast (Delta OD) and the ideal observer signal-to-noise ratio (SNRI) for a number of relevant anatomical details at various positions in the anatomy. Detector noise and system unsharpness are modeled and their influence on image quality is considered. A measure of useful dynamic range is computed and defined as the fraction of the image that is reproduced at an optical density such that the film gradient exceeds a preset value. The effective dose is used as a measure of the radiation risk for the patient. A novel approach to patient dose and image quality optimization has been developed and implemented. It is based on a reference system acknowledged to yield acceptable image quality in a clinical trial. Two optimizations schemes have been studied, the first including, the contrast of vessels as measure of image quality and the second scheme using also the signal-to-noise ratio of calcifications. Both schemes make use of our measure of useful dynamic range as a key quantity. A large variety of imaging conditions was simulated by varying the tube voltage, antiscatter device, screen-film system, and maximum optical density in the computed image. It was found that the optical density is crucial in screen-film chest radiography. Significant dose savings (30%-50%) can be accomplished without sacrificing image quality by using low-atomic-number grids with a low grid ratio or an air gap and more sensitive screen-film system. Dose-efficient configurations proposed by the model agree well with the example of good radiographic technique suggested by the European Commission. (C) 2001 American Association of Physicists in Medicine.en_US
dc.format.extent2007 - 2019en_US
dc.publisherAMER INST PHYSICSen_US
dc.titleSchemes for the optimization of chest radiography using a computer model of the patient and x-ray imaging systemen_US
dc.typeJournal Article
rioxxterms.typeJournal Article/Reviewen_US
dc.relation.isPartOfMEDICAL PHYSICSen_US
pubs.notesaffiliation: Sandborg, M (Reprint Author), Linkoping Univ, Fac Hlth Sci, Dept Radiat Phys, SE-58185 Linkoping, Sweden. Linkoping Univ, Fac Hlth Sci, Dept Radiat Phys, SE-58185 Linkoping, Sweden. Royal Marsden NHS Trust, Joint Dept Phys, London SW3 6JJ, England. Linkoping Univ, Fac Hlth Sci, Dept Radiat Phys, SE-58185 Linkoping, Sweden. keywords: chest radiography; voxel phantom; contrast; SNR; optimization keywords-plus: MONTE-CARLO; DIAGNOSTIC-RADIOLOGY; VOXEL PHANTOM; CONTRAST; QUALITY; FLUOROSCOPY; SCREENS; PROGRAM; SEARCH; GRIDS research-areas: Radiology, Nuclear Medicine & Medical Imaging web-of-science-categories: Radiology, Nuclear Medicine & Medical Imaging number-of-cited-references: 32 times-cited: 23 usage-count-last-180-days: 0 usage-count-since-2013: 2 journal-iso: Med. Phys. doc-delivery-number: 484UC unique-id: ISI:000171707100004 da: 2018-07-30en_US
pubs.notesNot knownen_US
pubs.organisational-group/ICR/Primary Group
pubs.organisational-group/ICR/Primary Group/Royal Marsden Clinical Units
pubs.embargo.termsNot knownen_US
dc.contributor.icrauthorDance, Daviden_US
dc.contributor.icrauthorMcVey, Grahamen_US

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