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Use of an ivory wedge as a test phantom in analysing the influence of scattered radiation and tube potential on radiolographic contrast in intraoral dental radiography
Linköping University, Department of Medicine and Care, Radiation Physics. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0003-0209-498X
Linköping University, Department of Medicine and Health Sciences, Radiation Physics .ORCID iD: 0000-0003-3352-8330
1993 (English)In: Radiation Protection Dosimetry, ISSN 0144-8420, E-ISSN 1742-3406, Vol. 49, no 1, 125-127 p.Article in journal (Refereed) Published
Abstract [en]

Contrast, noise and spatial resolution are fundamental physical concepts used to describe image quality. Contrast is one of the most important parameters in conventional film radiography. To facilitate the analysis of the radiographic contrast over a wide range of optical densities, an ivory wedge representative of objects with marked tissue discontinuities has been constructed. It can be used either separately or included within a PMMA phantom representing the middle face to simulate realistic scatter conditions. It is thus possible to investigate how radiographic contrast may be influenced by kV setting, beam filtration, type of generator (constant potential or single pulse) and type of film. The phantom has been used in optimising image quality relative to radiation risk, with the radiographic contrast being determined both theoretically and experimentally in terms of type of film (D and E speed), radiation and object contrast. The importance of controlling physical parameters when investigating image quality and how to achieve this using a well defined phantom is clearly demonstrated.

Place, publisher, year, edition, pages
1993. Vol. 49, no 1, 125-127 p.
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Medical and Health Sciences
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URN: urn:nbn:se:liu:diva-20944OAI: oai:DiVA.org:liu-20944DiVA: diva2:236861
Available from: 2009-09-25 Created: 2009-09-25 Last updated: 2017-12-13

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Alm Carlsson, GudrunSandborg, Michael

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