
Proceedings Paper
Towards active image guidance: tracking of a fiducial in the thorax during respiration under x-ray fluoroscopyFormat | Member Price | Non-Member Price |
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Paper Abstract
A central purpose of image-guidance is to assist the interventionalist with feedback of geometric performance in the
direction of therapy delivery. Tradeoffs exist between accuracy, precision and the constraints imposed by parameters
used in the generation of images. A framework that uses geometric performance as feedback to control these parameters
can balance such tradeoffs in order to maintain the requisite localization precision for a given clinical procedure. We
refer to this principle as Active Image-Guidance (AIG). This framework requires estimates of the uncertainty in the
estimated location of the object of interest. In this study, a simple fiducial marker detected under X-ray fluoroscopy is
considered and it is shown that a relation exists between the applied imaging dose and the uncertainty in localization for
a given observer. A robust estimator of the location of a fiducial in the thorax during respiration under X-ray fluoroscopy
is demonstrated using a particle filter based approach that outputs estimates of the location and the associated spatial
uncertainty. This approach gives an rmse of 1.3mm and the uncertainty estimates are found to be correlated with the
error in the estimates. Furthermore, the particle filtering approach is employed to output location estimates and the
associated uncertainty not only at instances of pulsed exposure but also between exposures. Such a system has
applications in image-guided interventions (surgery, radiotherapy, interventional radiology) where there are latencies
between the moment of imaging and the act of intervention.
Paper Details
Date Published: 22 March 2007
PDF: 12 pages
Proc. SPIE 6509, Medical Imaging 2007: Visualization and Image-Guided Procedures, 650929 (22 March 2007); doi: 10.1117/12.710615
Published in SPIE Proceedings Vol. 6509:
Medical Imaging 2007: Visualization and Image-Guided Procedures
Kevin R. Cleary; Michael I. Miga, Editor(s)
PDF: 12 pages
Proc. SPIE 6509, Medical Imaging 2007: Visualization and Image-Guided Procedures, 650929 (22 March 2007); doi: 10.1117/12.710615
Show Author Affiliations
Sami Siddique, Princess Margaret Hospital, Ontario Cancer Research Institute (Canada)
Univ. of Toronto (Canada)
Univ. of Toronto (Canada)
David Jaffray, Princess Margaret Hospital, Ontario Cancer Research Institute (Canada)
Univ. of Toronto (Canada)
Univ. of Toronto (Canada)
Published in SPIE Proceedings Vol. 6509:
Medical Imaging 2007: Visualization and Image-Guided Procedures
Kevin R. Cleary; Michael I. Miga, Editor(s)
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