title: Flip-registration procedure of three-dimensional laser surface scanning images on quantitative evaluation of facial asymmetries.
abstract: The aim of the study was to find a proper method that may evaluate the severity of facial asymmetry quickly and accessibly in clinics.
  
  
  METHODS
  The three-dimensional image data of facial asymmetry patients were collected with three-dimensional laser surface scanning, and the desired therapy outcomes were simulated in computers by flip-registration procedure. The discrepancy between desired results and initial images was calculated automatically, and a colored hypsography was printed. A questionnaire was given to both the patient and the craniofacial surgeon to examine the symmetry, accessibility, achievability, and helpfulness of these outcomes.
  
  
  RESULTS
  The three-dimensional image data offered by laser surface scanning were accurate and convenient. The desired results were reliable and acceptable to the patients. The colored hypsography was clear and accessible and achieved high appreciations from the surgeons.
  
  
  CONCLUSIONS
  Three-dimensional laser surface scanning together with flip registration procedure can evaluate the severity of facial asymmetry quickly, quantitatively, and effectively with an achievable outcome. It is welcomed by the craniofacial surgeons and has a great potential in clinic application.
authors.affiliation: Department of Plastic and Reconstructive Surgery, Shanghai 9th People's Hospital, Shanghai Jiaotong University Medical School, Shanghai, China.
authors.forename: Zheyuan
authors.initials: Z
authors.lastname: Yu
authors.forename: Xiongzheng
authors.initials: X
authors.lastname: Mu
authors.forename: Shengzhi
authors.initials: S
authors.lastname: Feng
authors.forename: Jiayi
authors.initials: J
authors.lastname: Han
authors.forename: Tisheng
authors.initials: T
authors.lastname: Chang
mesh_terms: D002508:Cephalometry / Q000379:methods; D002648:Child; D003198:Computer Simulation; D005146:Facial Asymmetry / Q000175:diagnosis*; D005150:Facial Hemiatrophy / Q000175:diagnosis; D005151:Facial Injuries / Q000175:diagnosis; D005153:Facial Neoplasms / Q000601:surgery; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007834:Lasers; D008297:Male; D015903:Moire Topography / Q000379:methods; D010342:Patient Acceptance of Health Care; D010347:Patient Care Planning; D010781:Photography / Q000379:methods; D013515:Surgery, Oral; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome; D055815:Young Adult