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http://dx.doi.org/10.14368/jdras.2013.29.3.249

Effect of Head Positioning in Panoramic Radiography on the Vertical and Horizontal Magnification : Displacement along the Sagittal and Transverse Plane  

Kim, Yong-Gun (Department of Periodontology, School of Dentistry, Kyungpook National University)
Lee, Young-Kyun (Department of Oral biochemistry, School of Dentistry, Kyungpook National University)
An, Seo-Young (Department of Oral and Maxillofacial Radiology, School of Dentistry, Kyungpook National University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.29, no.3, 2013 , pp. 249-258 More about this Journal
Abstract
The purpose of this study was to investigate how image magnification in dental panoramic radiography is influenced by object position. Five metal balls (4 mm in diameter, 2 for the anterior and 3 for the posterior region on the right side) were placed above alveolar crest of dry skull considering extraction socket and dental arch. Dry skull was radiographed using OP-100D (Instrumentarium Imaging Co., Tuusula, Finland) at proper and displaced position along the sagittal and transverse plane at 3 mm, 6 mm, 9 mm, 12 mm and 15 mm using special mount which can control precise movement. Images were stored in DICOM files and were measured by ruler equipped within INFINITT PACS software (Infinitt Co., Ltd., Seoul, Korea). The mean horizontal magnification was 1.224-1.439 and mean vertical magnification was 1.286 - 1.345 at proper position. Vertical magnification resulted in less variation (1.245-1.418) than horizontal magnification (0.798-6.297) according to the sagittal and transverse displacements. Head positioning is important for linear measurement on panoramic radiography and inclusion of standard object (for instance, metal ball) is helpful to anticipate exact magnification of panoramic radiographs at various location.
Keywords
Head position; Magnification; Panoramic radiography;
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