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KMID : 1004520140300010001
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Journal of Dental Rehabilitation and Applied Science
2014 Volume.30 No. 1 p.1 ~ p.8
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Effect of head positioning on the vertical and horizontal magnification in panoramic radiographs: rotation along the sagittal and transverse plane
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Kim Yong-Gun
Byun Jin-Seok
An Seo-Young
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Abstract
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Purpose: The purpose of this study was to investigate the effect of head position changes on vertical and horizontal magnification in dental panoramic radiographs.
Materials and Methods: Five 4 mm metal balls were placed above alveolar crest of dry skull considering extraction socket and dental arch. Panoramic radiographs were taken by OP-100D (Instrumentarium Imaging Co.,
Tuusula, Finland) at proper and rotated head position along the sagittal and transverse axis at 3 - 20° upwardly, downwardly, to the left and to the right rotation. Images were stored in DICOM files and were measured by ruler equipped within INFINITT PACS software.
Results: The mean horizontal magnification was 1.22 ± 0.01 - 1.44 ± 0.01 and mean vertical magnification was 1.29 ± 0.00 - 1.35 ± 0.02 at standard head position. There was statistical significance of horizontal magnification between the anterior (1.24 ± 0.02 - 1.31 ± 0.03) and the posterior area (1.40 ± 0.03 - 1.33 ± 0.02) (P < 0.05). Vertical magnification resulted in less variation (1.24 ± 0.01 - 1.37 ± 0.02) than horizontal magnification (0.88 ± 0.03 - 3.73 ± 0.16) according to the rotation. There was statistical significant difference on horizontal magnification (P < 0.05).
Conclusion: In rotated head position, the horizontal magnification should be considered because these can cause distortion on panoramic radiographs.
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KEYWORD
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head position, magnification, panoramic radiographs
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