PhD Candidate
Medical Biophysics,
University of Western Ontario,
Imaging Research Laboratories, Robarts Research Institute
PEng
Professional Engineer (2006)
MASc
Systems Design Engineering, University of Waterloo
BASc
Systems Design Engineering, University of Waterloo
Contact info:
awiles@imaging.robarts.ca
RESEARCH INTERESTS
In simple terms, we are creating a video game to assist the performance of very accurate surgery. A virtual reality system and ultrasound images allow the surgeon to “see” inside the beating heart. A tracking system reports the position and orientation of the surgical tools and ultrasound image.
Measurement errors (a function of position, orientation and tool design) are common to all tracking systems, and these errors affect the accuracy of the surgeon. The error patterns can become complicated where different amounts of error occur in different directions. These error patterns can be predicted and used as feedback to the surgeon to indicate the level of accuracy at the given time. Knowing the error patterns, the surgeon has two options: change the tool to a differently designed device or change the position and orientation to reduce the impact of the errors.
The objective of my project has two steps: (1) develop mathematical models for the error patterns and (2) use these models as a feedback mechanism so that the surgeon can improve the accuracy.
KEY QUESTIONS
Can we estimate the measurement uncertainty of identifying the position of a surgical target?
Can we use the resulting statistical model as a feedback mechanism such that the surgeon can optimize the surgical outcome can be improved?
SELECTED PUBLICATIONS
Peer Reviewed Papers
1. Wiles AD, Likholyot A, Frantz DD, Peters TM. A Statistical Model for Point-Based Target Registration Error with Anisotropic Fiducial Localizer Error. IEEE Transactions on Medical Imaging. In Press.
2. Wiles AD, Peters TM. Improved Statistical TRE Model When Using a Reference Frame. Medical Image Computing and Computer-Assisted Intervention - MICCAI 2007: 10th International Conference, Brisbane, Australia. Oct. 29 - Nov. 2, 2007, Proceedings, PartI. Lecture Notes in Computer Science 4791. N. Ayache, S. Ourselin and A. Maeder (Eds.). P442-449, 2007.
3. Wiles AD, Guiraudon G, Moore J, Wedlake C, Linte CL, Bainbridge D, Jones D, Peters TM. Navigation Accuracy for an Intra-Cardiac Procedure using VR-Enhanced Ultrasound. In Proceedings of SPIE Medical Imaging 2007: Visualization, Image-Guided Procedures, Volume 6509, San Diego, CA, USA, February 17-22, 2007.
4. Wiles AD, Thompson DG, Frantz DD. Accuracy assessment and interpretation for optical tracking systems. In Proceedings of SPIE, Medical Imaging, Visualization, Image-Guided Procedures, and Display, Volume 5367, pages 421–432, San Diego, CA, USA, February 14-19, 2004.
5. Frantz DD, Wiles AD, Leis SE, Kirsch SR. Accuracy Assessment Protocols for Electromagnetic Tracking System. Phys. Med. Biol. 48(2003) 2241-2251, July 2003.
CURRICULUM VITAE
CV (download PDF)