Accuracy of linear measurements from cone-beam computed tomography-derived surface models of different voxel sizes

Damstra, Janalt; Fourie, Zacharias; Slater, J.J.R. Huddleston; Ren, Yijin

doi:10.1016/j.ajodo.2009.06.016

Cited by 160 publications

(165 citation statements)

References 17 publications

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“…Our findings regarding accuracy are in line with those of a previous study that found two different CBCT systems, the NewTom QR DVT 9000 (Aperio Inc., Sarasota, FL) and the Hitachi MercuRay (Hitachi Medico Technology, Tokyo, Japan), to provide similar, highly accurate data with <1% error when compared to physical measurements [16]. Our results are also in line with another study that showed increasing voxel resolution did not affect the accuracy of surface model measurements [17].…”

Section: Discussionsupporting

confidence: 82%

Accuracy of CBCT Measurements of a Human Skull

et al. 2010

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The purpose of this study is to assess the accuracy and reproducibility of cone-beam computed tomography (CBCT) measurements of a human dry skull by comparing them to direct digital caliper measurements. Heated gutta-percha was used to mark 13 specific distances on a human skull, and the distances were directly measured using a digital caliper and on CBCT images obtained with Iluma (3M Imtec, OK, USA) and 3D Accuitomo 170 (3D Accuitomo; J Morita Mfg. Corp., Kyoto, Japan) CBCT imaging systems. Iluma images were obtained at 120 kVp and 3.8 mA and reconstructed using voxel sizes of 0.2 and 0.3 mm 3 . Accuitomo images were obtained at 60 kVp and 2 mA and a voxel size of 0.250 mm 3 . In addition, 3-D reconstructions were produced from images obtained from both systems. All measurements were made independently by three trained observers and were repeated after an interval of 1 week. Agreement between observers and image type was assessed by calculating Pearson correlation coefficients, with a level of significance set at p<0.05. Pearson correlation coefficients between readings ranged from 0.995 to 1 for all image types. Correlations among observers were also very high, ranging from 0.992 to 1 for the first reading and from 0.992 to 1 for the second reading for the different image types. All CBCT image measurements were identical and highly correlated with digital caliper measurements. Accuracy of measurements of various distances on a human skull obtained from different CBCT units and image types is comparable to that of digital caliper measurements.

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Section: Discussionsupporting

confidence: 82%

Accuracy of CBCT Measurements of a Human Skull

et al. 2010

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“…9,15 Two previous studies have investigated the effect of head position on linear measurements and found it insignificant. 16,17 Another study compared measurement accuracy using two different voxel settings with no difference in accuracy between the two groups. 17 Overall, various studies have investigated the accuracy of landmark localization on CBCT images.…”

Section: Introductionmentioning

confidence: 99%

Asymmetry assessment using cone beam CT

Sievers¹,

Larson

Gaillard

et al. 2012

The Angle Orthodontist

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Objective: To estimate possible differences in skeletal asymmetry between patients with skeletal Class I and skeletal Class II relationships. Materials and Methods: Cone beam computed tomography (CBCT) images were examined from 70 consecutive patients who presented for orthodontic care and fit the inclusion criteria. Asymmetry was quantified using an asymmetry index developed by Katsumata et al. Anatomic landmarks were defined and reference planes were established to determine the asymmetry of the landmarks using a constructed coordinate plane system. Thirty randomly selected patients were reanalyzed to assess the reliability of the method. Results: Statistical analysis did not find any significant relationship between asymmetry and A-P skeletal relationship for any of the landmarks. Asymmetry index scores were reproducible within a certain range of agreement for each landmark. Conclusions: Based on this study, the discrepant jaw growth resulting in a Class II skeletal pattern results in no more skeletal asymmetry than Class I skeletal patterns. (Angle Orthod. 2012;82:410-417.)

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“…Also, the voxel size itself has an important influence on the noise in the orthogonal slices: the smaller the voxel size, the greater the noise, but the better the spatial resolution. It is therefore crucial in the future studies to investigate all parameters and their influence on the reconstruction accuracy [34][35][36][37] .…”

Section: Discussionmentioning

confidence: 99%

Comparison of two cone beam computed tomography multiplanar reconstruction orientation protocols

Kumar¹,

Ang²,

Williams³

et al. 2013

JBGC

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Objective: The utilization of cone beam computed tomographic imaging for oral implants has increased enormously for precise determination of anatomic dimensions. However, the impact of reorientation of data that influences the constructed panoramic view and thus the measurements on generated cross sectional views has not been explored. This study is undertaken to explore if differences exist in the implant height and width measurement when the whole data is reoriented from the standard manufacturer's setting to an aligned protocol (perpendicular to the implant (XYZ) settings). Material and Methods:Two different orientation protocols were set up, standard and aligned or perpendicular setting (XYZ), and implant height and width measurements derived from these were compared to the original known measurements. Results:The range of differences between actual dimensions and measurements obtained using each orientation method using McNemar's Change test in the four accuracy categories (exact, +0.20, +0.25, and +0.50) showed the aligned orientation produced larger proportion of width measurements between +0.25 and +0.50 compared to standard for width measures; however, these differences were not statistically significant. Implant length measurements varied widely and this variability was irrespective of orientation method. Conclusions:The aligned/perpendicular (XYZ) protocol produces implant width measurements more accurate than length when compared to the standard protocol.

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Accuracy of linear measurements from cone-beam computed tomography-derived surface models of different voxel sizes

Cited by 160 publications

References 17 publications

Accuracy of CBCT Measurements of a Human Skull

Accuracy of CBCT Measurements of a Human Skull

Asymmetry assessment using cone beam CT

Comparison of two cone beam computed tomography multiplanar reconstruction orientation protocols

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