Technical Note: A comparison of point set registration methods for electromagnetic tracking
Götz TI, Wankerl H, Tomé AM, Meyer-Baese A, Bert C, Hensel B, Lang EW (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 46
Pages Range: 2025-2030
Journal Issue: 5
DOI: 10.1002/mp.13443
Abstract
Purpose: High dose rate brachytherapy applies intense and destructive radiation. A treatment plan defines radiation source dwell positions to avoid irradiating healthy tissue. The study discusses methods to quantify any positional changes of source locations along the various treatment sessions. Methods: Electromagnetic tracking (EMT) localizes the radiation source during the treatment sessions. But in each session the relative position of the patient relative to the filed generator is changed. Hence, the measured dwell point sets need to be registered onto each other to render them comparable. Two point set registration techniques are compared: a probabilistic method called coherent point drift (CPD) and a multidimensional scaling (MDS) technique. Results: Both enable using EMT without external registration and achieve very similar results with respect to dwell position determination of the radiation source. Still MDS achieves smaller grand average deviations (CPD-rPSR: MD = 2.55 mm, MDS-PSR: MD = 2.15 mm) between subsequent dwell position determinations, which also show less variance (CPD-rPSR: IQR = 4 mm, MDS-PSR: IQR = 3 mm). Furthermore, MDS is not based on approximations and does not need an iterative procedure to track sensor positions inside the implanted catheters. Conclusion: Although both methods achieve similar results, MDS is to be preferred over rigid CPD while nonrigid CPD is unsuitable as it does not preserve topology.
Authors with CRIS profile
Christoph Bert
Professur für Med. Strahlenphysik
Bernhard Hensel
Max Schaldach-Stiftungsprofessur für Biomedizinische Technik
Involved external institutions
Universität Regensburg
Germany (DE)
Florida State University (FSU)
United States (USA) (US)
IEETA - Instituto de Engenharia Electrónica e Telemática de Aveiro
Portugal (PT)
Germany (DE)
Florida State University (FSU)
United States (USA) (US)
IEETA - Instituto de Engenharia Electrónica e Telemática de Aveiro
Portugal (PT)
How to cite
APA:
Götz, T.I., Wankerl, H., Tomé, A.M., Meyer-Baese, A., Bert, C., Hensel, B., & Lang, E.W. (2019). Technical Note: A comparison of point set registration methods for electromagnetic tracking. Medical Physics, 46(5), 2025-2030. https://doi.org/10.1002/mp.13443
MLA:
Götz, T. I., et al. "Technical Note: A comparison of point set registration methods for electromagnetic tracking." Medical Physics 46.5 (2019): 2025-2030.
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