title: Computer imaging software for profile photograph analysis.
abstract: OBJECTIVE
  To describe a novel calibration technique for photographs of different sizes and to test a new method of chin evaluation in relation to established analysis measurements.
  
  
  METHODS
  A photograph analysis and medical record review of 14 patients who underwent combined rhinoplasty and chin correction at an academic center. Patients undergoing concurrent orthognathic surgery, rhytidectomy, or submental liposuction were excluded. Preoperative and postoperative digital photographs were analyzed using computer imaging software with a new method, the soft tissue porion to pogonion distance, and with established measurements, including the cervicomental angle, the mentocervical angle, and the facial convexity angle.
  
  
  RESULTS
  The porion to pogonion distance consistently increased after the chin correction procedure (more in the osseous group). All photograph angle measurements changed toward the established normal range postoperatively.
  
  
  CONCLUSIONS
  Surgery for facial disharmony requires artistic judgment and objective evaluation. Although 3-dimensional video analysis of the face seems promising, its clinical use is limited by cost. For surgeons who use computer imaging software, analysis of profile photographs is the most valuable tool. Even when preoperative and postoperative photographs are of different sizes, relative distance comparisons are possible with a new calibration technique using the constant facial landmarks, the porion and the pupil. The porion-pogonion distance is a simple reproducible measurement that can be used along with established soft tissue measurements as a guide for profile facial analysis.
authors: Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology--Head and Neck Surgery, University of California, Davis, Medical Center, Sacramento, CA 95817, USA. travis.tollefson@yahoo.com
authors: Travis T
authors: TT
authors: Tollefson
authors: Jonathan M
authors: JM
authors: Sykes
mesh_terms: D000293:Adolescent; D000328:Adult; D000886:Anthropometry / Q000379:methods; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D010781:Photography; D011182:Postoperative Care; D011300:Preoperative Care; D012225:Rhinoplasty / Q000379:methods*; D012984:Software