Magnetocardiographic localization of arrhythmia substrates: a methodology study with accessory pathway ablation as reference

In magnetocardiographic (MCG) localization of arrhythmia substrates, a model of the thorax volume conductor is a crucial component of the calculations. In this study, the authors investigated different models of the thorax, to determine the most suitable to use in the computations. Their methods and...

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Bibliographic Details
Published in:IEEE transactions on medical imaging 1998-06, Vol.17 (3), p.479-484
Main Authors: Agren, P.L., Goranson, H., Hindmarsh, T., Knutsson, E., Mohlkert, D., Rosenqvist, M., Bergfeldt, L.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Cardiac dysrhythmias
Cardiology. Vascular system
Catheter Ablation
Catheters
Conductors
Female
Heart
Heart Conduction System - surgery
Humans
Interference
Magnetic resonance
Magnetic Resonance Imaging
Magnetics
Magnetism
Male
Mathematical models
Medical sciences
Medicin och hälsovetenskap
Middle Aged
Noninvasive medical procedures
Processor scheduling
Radio frequency
SQUIDs
Superconducting devices
Superconducting magnets
Thorax
Thorax - anatomy & histology
Wolff-Parkinson-White Syndrome - diagnosis
Wolff-Parkinson-White Syndrome - surgery
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Summary:In magnetocardiographic (MCG) localization of arrhythmia substrates, a model of the thorax volume conductor is a crucial component of the calculations. In this study, the authors investigated different models of the thorax, to determine the most suitable to use in the computations. Their methods and results are as follows. They studied 11 patients with overt Wolff-Parkinson-White syndrome, scheduled for catheter ablation. The MCG registrations were made with a 37-channel "superconducting quantum interference device" system. The underlying equivalent current dipole was computed for the delta-wave. Three models of the thorax were used: the infinite halfspace, a sphere and a box. For anatomical correlation and to define the suitable sphere and box, magnetic resonance images were obtained. As reference the authors used the position of the tip of the catheter, at successful radio-frequency-ablation, documented by cine-fluoroscopy. Nine patients could be evaluated. The mean errors (range) when using the infinite halfspace, the sphere and the box were 96 (49-125), 21 (5-39), and 36 mm (20-58 mm), respectively (p
ISSN:0278-0062
1558-254X
DOI:10.1109/42.712138