Accuracy of Linear Measurements Made on Cone Beam Computed Tomography Scans at Different Magnifications

  • Aisan Ghaznavi Department of Oral and Maxillofacial Radiology, Faculty of Dentistry , Urmia University of Medical Sciences, Urmia, Iran.
  • Dara Ghaznavi Department of Periodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
  • Solmaz Valizadeh Department of oral and maxillofacial radiology, School of Dentistry, Shahid Beheshti University of medical sciences, Tehran, Iran.
  • Zahra Vasegh Department of oral and maxillofacial radiology, School of Dentistry, Shahid Beheshti University of medical sciences, Tehran, Iran.
  • Muna Al-Shuhayeb Department of Periodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran

Abstract

Objective: This study aimed to evaluate the accuracy of linear measurements made on CBCT (New Tom VGi) scans with different image magnifications.
Methods: Forty-two titanium pins were inserted into seven dry sheep mandibles. Lengths of the pins were measured using a digital caliper with 0.01 mm readability, and the mandibles were radiographed using a CBCT unit. After reconstruction of CBCT images, three experienced radiologists measured the length and diameter of titanium pins at100%, 200% and 400% magnifications. Accuracy of measurements was analyzed using descriptive statistics and one-way analysis of variance (ANOVA) P<0.05 was considered statistically significant. Inter observer reliability was calculated using the intra class correlation coefficient (ICC) test.
Results: The mean differences of linear measurements from the actual lengths of pins were 0.1960 mm, 0.2143 mm and 0.2047 mm at 100%, 200% and 400% magnifications, respectively (P>0.05). The mean differences of linear measurements from the actual diameters of pins were 0.2206 mm, 0.2063 mm and 0.1984 mm at 100%, 200% and 400% magnifications, respectively (P>0.05). Inter observer reliability of pin length measurements was estimated to be0.285, 0.707 and 0.479 at 100%, 200% and 400%magnifications, respectively. Inter observer reliability of pin diameter measurements was 0 .078, 0.469 and 0.587 at 100%, 200% and 400%magnifications, respectively.
Conclusion: Based on the results, image magnification does not affect the accuracy of linear measurements made on CBCT scans. Inter observer reliability of pin length measurements was good at 200% magnification, while it was below the acceptable range at other magnifications. For measurement of pin diameters, this index was below the acceptable range at all magnifications.
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Published
2019-10-26
How to Cite
GHAZNAVI, Aisan et al. Accuracy of Linear Measurements Made on Cone Beam Computed Tomography Scans at Different Magnifications. Journal of Contemporary Medical Sciences, [S.l.], v. 5, n. 5, oct. 2019. ISSN 2413-0516. Available at: <http://www.jocms.org/index.php/jcms/article/view/684>. Date accessed: 03 june 2020.

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