title: A new optical technique to monitor joint motion using position sensitive detector.
abstract: BACKGROUND
  Evaluation of joint movements is essential to choose an appropriate rehabilitation protocol for a patient.
  
  
  OBJECTIVE
  The aim of this study is to suggest an alternative optical technique for measurement of joint angle which is convenient, inexpensive, and can be operated in real time.
  
  
  METHODS
  According to the principle of the triangulation method, position sensitive detector (PSD) converts reflected light signals into distance-related voltages. Various parameters were investigated to increase detection range and resolution of joint angle measurements.
  
  
  RESULTS
  The accuracy of the suggested optical sensor was verified by comparing with a commercial goniometer and 3D motion capture system.
  
  
  CONCLUSIONS
  This method can be applied to monitor recovery progress for the patient in rehabilitation and sport science.
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Gu-In
authors.initials: GI
authors.lastname: Jung
authors.affiliation: Korea University College of Medicine, Seoul, Korea.
authors.forename: Byung Kyu
authors.initials: BK
authors.lastname: Park
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Ji-Sun
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Tae-Hee
authors.initials: TH
authors.lastname: Lee
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Ju-Hyeon
authors.initials: JH
authors.lastname: Choi
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Han-Byeol
authors.initials: HB
authors.lastname: Oh
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: A-Hee
authors.initials: AH
authors.lastname: Kim
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Bong-Jun
authors.initials: BJ
authors.lastname: Goh
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Ji-Won
authors.initials: JW
authors.lastname: Kim
authors.affiliation: Yon-Sei Family Clinic, Kimpo, Korea.
authors.forename: Ki Sung
authors.initials: KS
authors.lastname: Lee
authors.affiliation: Department of Biomedical Engineering, BK21+ Research Institute of Biomedical Engineering, College of Biomedical and Health Science, Konkuk University, Chungju, Korea.
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Jun
mesh_terms: D001696:Biomechanical Phenomena; D006801:Humans; D007259:Infrared Rays; D009068:Movement; D026741:Physical Therapy Modalities; D016059:Range of Motion, Articular; D012815:Signal Processing, Computer-Assisted
keywords: Human joint angle; optical goniometer; position sensitive detector; range of motion; rehabilitation