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Influence of scattered radiation and tube potential on radiographic contrast: comparison of two different dental X-ray films
Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics. (Landstinget i Östergötland)
Linköping University, Department of Medicine and Health Sciences, Radiation Physics . Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0003-0209-498X
Linköping University, Center for Medical Image Science and Visualization, CMIV. Linköping University, Department of Medicine and Care, Radio Physics. Östergötlands Läns Landsting, Centre of Surgery and Oncology, Department of Radiation Physics. Linköping University, Faculty of Health Sciences.ORCID iD: 0000-0003-3352-8330
1991 (English)In: Dento-Maxillo-Facial Radiology, ISSN 0250-832X, E-ISSN 1476-542X, Vol. 20, no 3, 135-146 p.Article in journal (Refereed) Published
Abstract [en]

The fundamental concept in image quality of contrast has been analysed in terms of its elements; film, radiation and object contrast, and the theoretical formula to describe their interrelationship have been evaluated. Experiments were designed to investigate the dependence of radiographic contrast on the kV, the type of generator and dental film used (D and E speed). An ivory wedge was used as the object, both alone and within a polymethyl methacrylate phantom as scattering medium. Precise definition and control of the X-ray generators were achieved by means of measurements of the primary X-ray spectra using a Compton spectrometer. D speed was found to have higher film contrast than E speed when compared at the same optical density, due to its lower base and fog and lower level of saturation in these experiments. On the other hand, E speed was found to have wider latitude. The experimental object was reproduced with the highest radiographic contrast using D-speed film and, with a given type of generator, this increased when the kV was decreased. While no difference in scatter/primary ratios was observed using the two different films, a weak dependence on kV in the range from 36 to 77 kV was found and confirmed by Monte Carlo calculations. The results indicate that the D and E speed films used had equal energy absorption properties; the difference in radiographic performance is due to their different film characteristics. The importance of controlling the physical parameters (photon energy spectrum, base and fog and optical density level) when comparing image qualities is clearly demonstrated.

Place, publisher, year, edition, pages
1991. Vol. 20, no 3, 135-146 p.
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Medical and Health Sciences
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URN: urn:nbn:se:liu:diva-20914OAI: oai:DiVA.org:liu-20914DiVA: diva2:236787
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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Department of Radiation PhysicsRadiation Physics Center for Medical Image Science and Visualization, CMIVFaculty of Health SciencesRadio Physics
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