Paper Info
Title
Preliminary Study On Optical Feature Detection For Head Tracking In Radiation Therapy
Abstract
Marker-less tracking provides a non-invasive as well as comfortable approach to compensate for head motion in high precision radiotherapy. However, it suffers from a lack of point-to-point correspondences, typically requiring characteristic spatial landmarks to match point clouds. In this study, we show that cutaneous and subcutaneous structures can be uncovered using an 850 nm laser setup. For three subjects, we compare features extracted from camera images with MR scans serving as an anatomical ground truth. The results confirm the validity of the optically detected structures. The negative correlation between skin thickness and reflected light energy is likewise predicted by Monte-Carlo simulations and can be used to improve spatial point cloud matching. Tissue thickness and its facial structure can be predicted with sub-millimeter accuracy using a Support Vector regression machine. In addition, the optical measurements reveal the location of vessels that are not immediately visible in the MR scan. These promising findings highly encourage its application for a marker-less tracking system.
Year
DOI
Venue
2013
10.1109/BIBE.2013.6701632
2013 IEEE 13TH INTERNATIONAL CONFERENCE ON BIOINFORMATICS AND BIOENGINEERING (BIBE)
Keywords
Field
DocType
tracking,radiation therapy,monte carlo methods,skin,support vector machines,motion compensation,feature extraction,regression analysis
Computer vision,Computer science,Support vector machine,Motion compensation,Tracking system,Laser,Feature extraction,Ground truth,Artificial intelligence,Point cloud,Reflection (physics)
Conference
ISSN
Citations 
PageRank 
2471-7819
2
0.61
References 
Authors
3
6
Name
Order
Citations
PageRank
Tobias Wissel1166.16
Patrick Stuber262.42
Benjamin Wagner3387.02
Ralf Bruder4249.88
Achim Schweikard517342.11
Floris Ernst66919.42