title: Correction of head movements in positron emission tomography using point source tracking system: a simulation study.
abstract: OBJECTIVE
  The motion of the head during brain positron emission tomography (PET) acquisitions has been identified as a source of artifact in the reconstructed image. In this study, a method is described to develop an image-based motion correction technique for correcting the post-acquisition data without using external optical motion-tracking system such as POLARIS.
  
  
  METHODS
  In this technique, GATE has been used to simulate PET brain scan using point sources mounted around the head to accurately monitor the position of the head during the time frames.
  
  
  RESULTS
  The measurement of head motion in each frame showed a transformation in the image frame matrix, resulting in a fully corrected data set.
  
  
  CONCLUSIONS
  Using different kinds of phantoms and motions, the accuracy of the correction method is tested and its applicability to experimental studies is demonstrated as well.
authors.affiliation: Department of Nuclear Engineering and Physics, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
authors.forename: Babak
authors.initials: B
authors.lastname: Nazarparvar
authors.forename: Mojtaba
authors.initials: M
authors.lastname: Shamsaei
authors.forename: Hossein
authors.initials: H
authors.lastname: Rajabi
mesh_terms: D006257:Head / Q000000981:diagnostic imaging*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D009010:Monte Carlo Method; D009068:Movement; D019047:Phantoms, Imaging; D049268:Positron-Emission Tomography / Q000379:methods*; D012399:Rotation