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Automatic Electrode and CT/MR Image Co-localisation for Electrocardiographic Imaging

  • YingLiang Ma
  • Umesh Mistry
  • Ashley Thorpe
  • R. James Housden
  • Zhong Chen
  • Walther H. W. Schulze
  • C. Aldo Rinaldi
  • Reza Razavi
  • Kawal S. Rhode
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7945)

Abstract

Body surface potential mapping (BSPM) can be used to non-invasively measure the electrical activity of the heart using a dense set of thorax electrodes and a CT/MR scan of the thorax to solve the inverse problem of electrophysiology (ECGi). This technique now shows potential clinical value for the assessment and treatment of patients with arrhythmias. Co-localisation of the electrode positions and the CT/MR thorax scan is essential. This manuscript describes a method to perform the co-localisation using multiple biplane X-ray images. The electrodes are automatically detected and paired in the X-ray images. Then the 3D positions of the electrodes are computed and mapped onto the thorax surface derived from CT/MR. The proposed method is based on a multi-scale blob detection algorithm and the generalized Hough transform, which can automatically discriminate the leads used for BSPM from other ECG leads. The pairing method is based on epi-polar constraint matching and line pattern detection which assumes that BSPM electrodes are arranged in strips. The proposed methods are tested on a thorax phantom and two clinical cases. Results show an accuracy of 0.33 ± 0.20mm for detecting electrodes in the X-ray images and a success rate of 95.4%. The automatic pairing method achieves a 91.2% success rate.

Keywords

Iterative Close Point Body Surface Potential Mapping Blob Size Blob Detection Epicardial Potential 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • YingLiang Ma
    • 1
  • Umesh Mistry
    • 1
  • Ashley Thorpe
    • 1
  • R. James Housden
    • 1
  • Zhong Chen
    • 1
  • Walther H. W. Schulze
    • 2
  • C. Aldo Rinaldi
    • 3
  • Reza Razavi
    • 1
  • Kawal S. Rhode
    • 1
  1. 1.Division of Imaging Sciences and Biomedical EngineeringKing’s College LondonUK
  2. 2.Institute of Biomedical EngineeringKarlsruhe Institute of Technology (KIT)KarlsruheGermany
  3. 3.Department of CardiologyGuy’s & St. Thomas’ Hospitals NHS Foundation TrustLondonUK

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