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The effect of anatomical noise on perception of low contrast in intra-oral radiographs: an in vitro study
Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden; Department of Oral Radiology, Postgraduate Dental Education Center, Örebro, Sweden.
Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden; Department of Radiation Physics, Skåne University Hospital, Malmö, Sweden.
Örebro University, School of Medical Sciences. Postgraduate Dental Education Center.
Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden.
2016 (English)In: Dento-Maxillo-Facial Radiology, ISSN 0250-832X, E-ISSN 1476-542X, Vol. 45, no 4, 20150402Article in journal (Refereed) Published
Abstract [en]

Objectives: Radiographic images suffer from varying amounts of noise. The most studied 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 low-contrast 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.

Place, publisher, year, edition, pages
London, United Kingdom: British Institute of Radiology , 2016. Vol. 45, no 4, 20150402
Keyword [en]
Contrast sensitivity, dental, digital, radiography
National Category
Radiology, Nuclear Medicine and Medical Imaging Dentistry
Research subject
Radiology
Identifiers
URN: urn:nbn:se:oru:diva-49439DOI: 10.1259/dmfr.20150402ISI: 000376216200001PubMedID: 26891747OAI: oai:DiVA.org:oru-49439DiVA: diva2:913634
Available from: 2016-03-22 Created: 2016-03-22 Last updated: 2017-10-17Bibliographically approved

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