The effect of anatomical noise on perception of low contrast in intra-oral radiographs : an in vitro study

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The effect of anatomical noise on perception of low contrast in intra-oral radiographs : an in vitro study

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Publication Article, peer reviewed scientific
Title The effect of anatomical noise on perception of low contrast in intra-oral radiographs : an in vitro study
Author(s) Olsson, Lars ; Nilsson, Mats ; Svensson, Björn ; Hellén-Halme, Kristina
Date 2016
English abstract
and discussed of these is random noise. However, recent research has shown that the projected anatomy contributes substantially to noise, especially when detecting low-contrast objects in the images. Our aim, therefore, was to evaluate the extent to which overprojected anatomical noise affects the detection of low-contrast objects in intra-oral images. Methods: Our study used four common sensor models. With each sensor, we took four series of images, three series with and one series without an anatomical phantom present. In each series, we exposed a low-contrast phantom at 18 different exposure times using a standardized method. 4 observers evaluated all 288 images. Results: The low-contrast characteristics differed substantially when imaging low contrast on a homogeneous background compared with imaging low contrast when an anatomical phantom was present. For three of the sensors, optimal exposure times for low-contrast imaging were found, while the fourth sensor displayed a completely different behaviour. Conclusions: Calibrating the low-contrast properties of an imaging system using lowcontrast objects on a homogeneous background is not recommended. On an anatomical background, low-contrast properties are completely different, and these will mimic the clinical situation much more closely, directing the operator how to best use the system. There is a clear demand for further research on this subject. Dentomaxillofacial Radiology (2016) 45, 20150402. doi: 10.1259/dmfr.20150402
DOI http://dx.doi.org/10.1259/dmfr.20150402 (link to publisher's fulltext.)
Publisher BIR
Host/Issue Dentomaxillofacial Radiology;
ISSN 0250-832X
Language eng (iso)
Subject(s) Medicine
Research Subject Categories::ODONTOLOGY
Handle http://hdl.handle.net/2043/20456 (link to this page)

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