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Proceedings Paper

Validation of the use of photogrammetry to register pre-procedure MR images to intra-procedure patient position for image-guided cardiac catheterization procedures
Author(s): Gang Gao; Segolene Tarte; Andy King; Yingliang Ma; Phani Chinchapatnam; Tobias Schaeffter; Reza Razavi; Dave Hawkes; Derek Hill; Kawal Rhode
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Paper Abstract

A hybrid X-ray and magnetic resonance imaging system (XMR) has been proposed as an interventional guidance for cardiovascular catheterisation procedure. However, very few hospitals can benefit from the XMR system because of its limited availability. In this paper we describe a new guidance strategy for cardiovascular catheterisation procedure. In our technique, intra-operative patient position is estimated by using a chest surface reconstructed from a photogrammetry system. The chest surface is then registered with the same surface derived from pre-procedure magnetic resonance (MR) images. The catheterisation procedure can therefore be guided by a roadmap derived from the MR images. Patients were required to hold the breath at end expiration during MRI acquisition. The surface matching accuracy is improved by using a robust trimmed iterative closest point (ICP) matching algorithm, which is especially designed for incomplete surface matching. Compared to the XMR system, the proposed guidance strategy is low cost and easy to set up. Experimental data were acquired from 6 volunteers and 1 patient. The patient data were collected during an electrophysiology procedure. In 6 out of 7 subjects, the experimental results show our method is accurate in term of reciprocal residual error (range from 1.66m to 3.75mm) and constant (closed-loop TREs range from 1.49mm to 3.55mm). For one subject, trimmed ICP failed to find the optimal transform matrix (residual = 4.89, TRE = 9.32) due to the poor quality of the photogrammetry-reconstructed surface. More studies are being carried on in clinical trials.

Paper Details

Date Published: 25 March 2008
PDF: 8 pages
Proc. SPIE 6918, Medical Imaging 2008: Visualization, Image-Guided Procedures, and Modeling, 69181Q (25 March 2008); doi: 10.1117/12.770113
Show Author Affiliations
Gang Gao, Univ. College London (United Kingdom)
Segolene Tarte, Univ. College London (United Kingdom)
Andy King, King's College London (United Kingdom)
Yingliang Ma, King's College London (United Kingdom)
Phani Chinchapatnam, Univ. College London (United Kingdom)
Tobias Schaeffter, King's College London (United Kingdom)
Reza Razavi, King's College London (United Kingdom)
Dave Hawkes, Univ. College London (United Kingdom)
Derek Hill, Univ. College London (United Kingdom)
Kawal Rhode, King's College London (United Kingdom)

Published in SPIE Proceedings Vol. 6918:
Medical Imaging 2008: Visualization, Image-Guided Procedures, and Modeling
Michael I. Miga; Kevin Robert Cleary, Editor(s)

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