Teyu Chyou
Position
Master of Science Student
in collaboration with HitLab NZ, 2011-2012
Qualifications
MSc Part I (Medical Phyiscs) University of CanterburyContact Details
Room
813, Physics and Astronomy
Phone: +64 3 364 2987Internal Phone: 7544
Email: teyu.chyou@pg.canterbury.ac.nz
Thesis
Patient setup guidance and position monitoring in radiotherapy using 3D vision
Supervisor: Dr Juergen Meyer and Adrian Clark
Research Profile
Teyu graduated from the University of Otago with a BSc(Hons) in Physics in 2008 and a BAppSc in 2009. He started his MSc in Medical Physics at the University of Canterbury in 2010.
His MSc thesis is related to radiotherapy and is a continuation and extension of a previous project, in which it was demonstrated that augmented Reality (AR) is a viable tool for patient positioning. AR based guidance systems provide a visualization of optimal patient position and posture, making it possible for non-rigid deformations to patient pose to be visualized. One limitation of an AR guidance system is that the accuracy of alignment can only be judged visually and therefore it is still susceptible to human error. The current research aims to address this by means of 3D vision methods to acquire actual patient surface contours in order to quantitatively determine offsets between the two surfaces related to the actual and the desired patient position, respectively.
Scanning a phantom using Lanman and Taubin's structured light temporal encoding sequence.
When a three dimensional object is viewed by a standard CMOS or CCD camera, the depth information along one dimension, namely the axis parallel to the line of sight, is lost. However, with multiple cameras (stereo vision), or a single camera with the aid of either a projector (active stereo with structured light) or a shadow moving across the object (swept-plane 3D scanning), depth information can be recovered through a mathematical procedure commonly referred to as triangulation.
In this project, active stereo-vision will be investigated using both temporal, and spatial encoding structured light sequences. With the help from the Human Interface Technology Laboratory (HITLabNZ) the viability of using the Xbox Kinect camera for real-time 3D surface acquisition will also be investigated.