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Schemes for the optimization of chest radiography using a computer model of the patient and x-ray imaging system
Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Radio Physics. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-3352-8330
Linköping University, Faculty of Health Sciences. Linköping University, Department of Medicine and Care, Radio Physics. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics.ORCID iD: 0000-0003-0209-498X
2001 (English)In: Medical physics (Lancaster), ISSN 0094-2405, Vol. 28, no 10, 2007-2019 p.Article in journal (Refereed) Published
Abstract [en]

A 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 (?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. ⌐ 2001 American Association of Physicists in Medicine.

Place, publisher, year, edition, pages
2001. Vol. 28, no 10, 2007-2019 p.
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Medical and Health Sciences
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URN: urn:nbn:se:liu:diva-26764DOI: 10.1118/1.1405840Local ID: 11364OAI: oai:DiVA.org:liu-26764DiVA: diva2:247314
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2017-12-13

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Sandborg, MichaelAlm Carlsson, Gudrun

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