Reliability of iWitness photogrammetry in maxillofacial application
10.7518/hxkq.2015.03.017
- VernacularTitle:iWitness摄影测量系统在颌面部应用的可信度研究
- Author:
Chengcheng JIANG
1
;
Qinggao SONG
;
Wei HE
;
Shang CHEN
;
Tao HONG
Author Information
1. 遵义医学院附属口腔医院口腔外科
- Keywords:
anthropometry;
photogrammetry;
accuracy;
precision;
three-dimensional
- From:
West China Journal of Stomatology
2015;(3):296-300
- CountryChina
- Language:Chinese
-
Abstract:
Objective??This?study?aims?to?test?the?accuracy?and?precision?of?iWitness?photogrammetry?for?measuring?the?facial?tissues?of?mannequin?head. Methods??Under?ideal?circumstances,?the?3D?landmark?coordinates?were?repeatedly?obtained?from?a?mannequin?head?using?iWitness?photogrammetric?system?with?different?parameters,?to?examine?the?precision?of?this?system.?The?differences?between?the?3D?data?and?their?true?distance?values?of?mannequin?head?were?computed.?Results??Ope-rator?error?of?3D?system?in?non-zoom?and?zoom?status?were?0.20?mm?and?0.09?mm,?and?the?difference?was?significant?(P<0.05).?Image?captured?error?of?3D?system?was?0.283?mm,?and?there?was?no?significant?difference?compared?with?the?same?group?of images?(P>0.05).?Error?of?3D?system?with?recalibration?was?0.251?mm,?and?the?difference?was?not?statistically?significant?compared?with?image?captured?error?(P>0.05).?Good?congruence?was?observed?between?means?derived?from?the?3D?photos?and direct anthropometry, with difference ranging from ?0.4 mm to +0.4 mm.Conclusion??This?study?provides?further?evi-dence?of?the?high?reliability?of?iWitness?photogrammetry?for?several?craniofacial?measurements,?including?landmarks?and?inter-landmark?distances.?The?evaluated?system?can?be?recommended?for?the?evaluation?and?documentation?of?the?facial?surface.
