Three-dimensional computed tomography landmark measurement in craniofacial surgical planning: Experimental validation in vitro

Cavalcanti, Marcelo Gusmão Paraíso; Haller, John; Vannier, Michael W.

doi:10.1016/s0278-2391(99)90434-2

Cited by 144 publications

(79 citation statements)

References 14 publications

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“…Similar findings have been reported by a number of authors. [22][23][24] Few studies have directly compared CT or CBCT with the lateral cephalogram.…”

Section: Discussionmentioning

confidence: 99%

“Black Bone” MRI: a potential non-ionizing method for three-dimensional cephalometric analysis—a preliminary feasibility study

Eley

Watt-Smith²,

Golding³

2013

Dentomaxillofacial Radiology

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Objectives: CT offers a three-dimensional solution to the inaccuracies associated with lateral cephalogram-based cephalometric analysis. However, it is associated with significant concerns regarding ionizing radiation exposure. MRI offers a non-ionizing alternative, but this has been less well investigated. We present a novel gradient echo MRI sequence ("Black Bone") and highlight the potential of this sequence in cephalometric analysis. Methods: After regional ethics approval, "Black Bone" imaging was obtained in eight patients in whom lateral cephalograms were available. "Black Bone", T 1 and T 2 weighted spin echo imaging were obtained in the mid-sagittal plane, and measurements were compared with those obtained on the lateral cephalogram using both the Advantage Windows Workstation (GE Medical Systems, Buckinghamshire, UK) and the Dolphin ® cephalometric software (v. 11.5.04.23, Premium; Dolphin Imaging, Chatsworth, CA) by one assessor. Further assessment was made by scoring the ease of landmark identification on a ten-point scale.Results: "Black Bone" imaging surpassed T 1 and T 2 weighted imaging in terms of cephalometric landmark identification. A number of mid-sagittal cephalometric landmarks could not be clearly identified on T 2 weighted imaging, making analysis impossible. Measurements on "Black Bone" demonstrated the smallest discrepancy when compared with those obtained on the lateral cephalogram. The discrepancy seen between measurements completed on mid-sagittal MRI and the lateral cephalogram was compounded by inherent inaccuracies of the lateral cephalogram. The overall mean discrepancy between distance measurements on "Black Bone" imaging and those on the lateral cephalogram was 1-2 mm. Conclusions: Overall, "Black Bone" MRI offered an improved method of cephalometric landmark identification over routine MRI sequences, and provides a potential non-ionizing alternative to CT for three-dimensional cephalometrics.

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“…Similar findings have been reported by a number of authors. [22][23][24] Few studies have directly compared CT or CBCT with the lateral cephalogram.…”

Section: Discussionmentioning

confidence: 99%

“Black Bone” MRI: a potential non-ionizing method for three-dimensional cephalometric analysis—a preliminary feasibility study

Eley

Watt-Smith²,

Golding³

2013

Dentomaxillofacial Radiology

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“…The extent of comminuted fractures is better demonstrated on the 3D-CT, where the size, shape, and displacement of individual fragments are clearly revealed. [25][26][27][28] The combination of multislice CT and 3D volume rendering technique allowed several improvements in imaging interpretation. Absence of free paranasal sinus fluid (clear sinus sign) in facial CT is a highly reliable criterion for excluding fractures involving the paranasal sinus walls.…”

mentioning

confidence: 99%

Computed Tomography evaluation of maxillofacial injuries

Prasad

Khanal

2017

J Coll Med Sci-Nepal

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Background & Objectives:The maxillofacial r egion, a complex anatomical structure, can be evaluated by conventional (plain) films, Tomography, Multidetector Computed Tomography, Three-Dimensional Computed Tomography, Orthopantomogram and Magnetic Resonance Imaging. The study was conducted with objective of describing various forms of maxillofacial injuries, imaging features of different types of maxillofacial fractures and the advantage of using Three-Dimensional Computed Tomography reconstructed image. Materials & Methods: A hospital based cross-sectional study was conducted among 50 patients during April 2014 to September 2016 using Toshiba Aquilion Prime 160 slice Multi Detector Computed Tomography scanner. Results: The maxillofacial fractures were significantly higher in male population (88%) than female population (12 %). Road traffic accidents were the most common cause of injury others being physical assault and fall from height. It was most common in 31-40 years (26%) and 21-30 (24%) years age group. Maxillary sinus was the commonest fracture (36%) followed by nasal bone and zygomatic bone (30%), mandible and orbital bones (28%). Soft tissue swelling was the commonest associated finding. Three dimensional images (3 D) compared to the axial scans missed some fractures. However, the extension of the complex fracture lines and degree of displacement were more accurately assessed. Complex fractures found were Le fort (6%) and naso-orbito-ethmoid (4%) fractures. Conclusion: The proper evaluation of complex anatomy of the facial bones requires Multidetector Computed Tomography which offers excellent spatial resolution enabling multiplanar reformations and three dimensional reconstructions for enhanced diagnostic accuracy and surgical planning.

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“…26,27 In terms of the comparison of the differences between the 3D computer-assisted cephalometric and manual cephalometric measurements, all 29 measurements did not indicate significant differences.…”

Section: Discussionmentioning

confidence: 91%

“…Previous reports 25,[27][28][29] showed that 62 mm or 62u provided a potential threshold for clinically meaningful differences. Our findings indicated that the mean differences between the 3D computer-assisted cephalometric and manual cephalometric measurements were less than 2 mm for all 29 measurements, and they showed the accuracy of 3D computer-assisted cephalometry, which is in line with the results of Cavalcanti et al, 10 Lopes et al, 30 and Bassam et al 31 The authors suggested performing cephalometric analysis on 3D-rendered models, which seemed to be the most appropriate approach in terms of accuracy and convenience.…”

Section: Discussionmentioning

confidence: 92%

Measurement accuracy of a computer-assisted three-dimensional analysis and a conventional two-dimensional method

Ölmez¹,

Görgülü²,

Akın³

et al. 2011

The Angle Orthodontist

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Objective: To determine the differences between manual and cephalometric measurements on different sections of the human skull, which were obtained using computer-assisted threedimensional (3D) analysis and conventional two-dimensional (2D) techniques. Materials and Methods: Measurements were carried out on 13 dry human skulls, then 2D cephalograms and 3D computed tomographic (CT) images were obtained. Anatomic landmarks were determined and marked with clay before CT images were taken, and the same landmarks were marked with the help of metallic balls and pins for lateral and frontal cephalograms. Manual, lateral/frontal cephalometric, and computer-assisted 3D cephalometric measurements were compared statistically. One-way analysis of variance and Tukey Honestly Significant Difference tests were used to compare the results among the groups. Results: All measurements were statistically insignificant between the computer-assisted 3D and manual measurements. On the other hand, the differences between the conventional 2D and the manual measurements were statistically significant. The greatest amount of magnification was found at the Nasion-Menton distance (14.6%), which was located at the farthest distance from the central x-ray beam in the lateral cephalogram (P , .01). For the same reason, the greatest enlargement (16.2%) was observed in the distance between the zygomaticomaxillary sutures on the conventional frontal cephalogram (P , .01). Conclusions: The computer-aided 3D cephalometric measurements were found to be more accurate than the conventional cephalometric measurements. The results revealed that 3D cephalometric measurements were consistent with the manual measurements. In addition, the magnification and distortion might limit the results of conventional cephalometric measurements. (Angle Orthod. 2011;81:375-382.)

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Three-dimensional computed tomography landmark measurement in craniofacial surgical planning: Experimental validation in vitro

Cited by 144 publications

References 14 publications

“Black Bone” MRI: a potential non-ionizing method for three-dimensional cephalometric analysis—a preliminary feasibility study

“Black Bone” MRI: a potential non-ionizing method for three-dimensional cephalometric analysis—a preliminary feasibility study

Computed Tomography evaluation of maxillofacial injuries

Measurement accuracy of a computer-assisted three-dimensional analysis and a conventional two-dimensional method

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