Accuracy of linear measurements obtained from stitched cone beam computed tomography images versus direct skull measurements

Background: To assess whether the linear measurements obtained from stitched cone beam computed tomography (CBCT) images were as accurate as the direct skull measurements. Methods: Nine dry human skulls were marked with gutta-percha at reference points to obtain Twenty-two linear measurements on each skull. Ten measurements in the cranio-caudal plane, two measurements in the antero-posterior plane, and ten measurements in the medio-lateral plane. CBCT linear measurements obtained using stitching software were measured and compared with direct skull measurements. Results: The absolute Dahlberg error between direct linear measurements and linear measurements on stitched CBCT images ranged from (0.07 mm to 0.41 mm). The relative Dahlberg error ranged from (0.2% to 1.8%). Moreover, Intra-class Correlation Coefficient (ICC) ranged from (0.97 to 1.0) indicating excellent agreement. Conclusion: Stitched CBCT linear measurements were highly comparable to the direct skull measurements using a digital caliper.

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Accuracy of linear measurements obtained from stitched cone beam computed tomography images versus direct skull measurements

F1000Research ◽

10.12688/f1000research.17751.1 ◽

2019 ◽

Vol 8 ◽

pp. 166

Author(s):

Doaa Ahmed Fouad Hamed ◽

Reham Mohamed Hamdy ◽

Sahar Hosny El Dessouky

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Reference Points ◽

Cone Beam ◽

Linear Measurements ◽

Gutta Percha ◽

Computed Tomography Images ◽

Lateral Plane ◽

Skull Measurements ◽

Human Skulls

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Custom Focal Trough in Cone-Beam Computed Tomography Reformatted Panoramic Versus Digital Panoramic for Mental Foramen Position to Aid Implant Planning

Journal of Clinical Imaging Science ◽

10.25259/jcis_150_2019 ◽

2020 ◽

Vol 10 ◽

pp. 34

Author(s):

Khaled Beshtawi ◽

Emad Qirresh ◽

Mohamed Parker ◽

Shoayeb Shaik

Keyword(s):

Computed Tomography ◽

Cone Beam Computed Tomography ◽

Mental Foramen ◽

Reference Points ◽

Cone Beam ◽

Vertical Position ◽

Linear Measurements ◽

Mean Values ◽

The Mean ◽

High Level

Objectives: To compare the linear measurements from digital panoramic (DP) radiographs and cone-beam computed tomography (CBCT) volumes for the localization of the mental foramen (MF). Material and Methods: Thirty-one patients with panoramic and CBCT radiographs depicted on the same machine were analyzed. The vertical and horizontal positions of the MF were compared by the differences in distances measured from reference points to the boundaries (tangents) of the MF in digital panoramic (DP) and CBCT reformatted panoramic (CRP) views. The vertical position of MF was also analyzed on CBCT oblique coronal views (CORO) and compared with its corresponding distances on DP and CRP views. Results: Statistically significant differences (P < 0.05) were found in all compared measurements between CRP and DP views. In addition, the vertical distance (Y1) compared between DP, CRP, and CORO views also showed a statistically significant measurement discrepancy in the mean distance (P < 0.000) with the highest mean difference of 1.59 mm (P < 0.05) was attained from Y1 (DP-CORO). Inter- and intra-examiner analysis indicated a high level of agreement for all measurements. Conclusion: The mean values of discrepancies in measurements between DP and CRP views for horizontal and vertical linear measurements were clinically tolerable. Nevertheless, significant differences in the vertical MF position were detected between the panoramic views (DP, CRP) and the coronal views (CORO). This implies that the use of coronal view measurements during implant planning might reduce the risk of neurovascular injuries.

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