Accuracy and reliability of three-dimensional craniofacial cone-beam CT superimposition method based on voxel registration
10.3760/cma.j.issn.1002-0098.2016.08.008
- VernacularTitle:基于体素的颅面部锥形束CT三维重叠准确性及可靠性评估
- Author:
Guanghui ZHOU
1
;
Li CHEN
;
Yingyuan SUN
;
Nan GE
;
Li SU
;
Yuxing BAI
Author Information
1. 100050,首都医科大学口腔医学院正畸科
- Keywords:
Cone-beam computed tomography;
Reproducibility of results;
Voxel registration;
Accuracy
- From:
Chinese Journal of Stomatology
2016;51(8):475-479
- CountryChina
- Language:Chinese
-
Abstract:
Objective To set up a three-dimensional(3D) craniofacial cone-beam CT(CBCT)superimposition method based on voxel registration,and evaluate the accuracy and reliability of different reference superimposition areas.Methods CBCT scans were taken on a dry skull for three times with a time-interval of two weeks,and CBCT scans were taken on ten adult volunteers twice with a time-interval of one month.The 3D superimposition based on voxel registration was set up by means of Analyze 12.0.The bilateral-zygomatic bone and anterior cranial base were selected as different reference areas for voxel overlapping.The 3D overlapping images were output into Geomagic Qualify 2013,and the surface distances on different craniofacial regions were measured.Three operators repeated three times of these superimposition and measurement.SPSS 19.0 were used to analyze the accuracy and reliability.Results When bilateral-zygomatic bone used as superimposition reference,the mean surface distance range of dry skull were from 0.035 to 0.064 mm,and volunteers from 0.099 to 0.182 mm.When the anterior cranial base used as superimposition reference,the mean surface distance range of dry skull were from 0.038 to0.071 mm,and volunteers from 0.127 to 0.218 mm.All these mean values were less than the CBCT voxel size0.25 mm(P＜0.05),and got sub-pixel precision.No significant difference was found between the different operators at different times(P＞0.05).Conclusions This study showed the high accuracy and reliability of 3D CBCT superimposition based on voxel registration,either the anterior cranial base or the bilateral-zygomatic bone as reference.This method could be used for evaluating 3D craniofacial treatment effects.
