- Workshop presentation
- Open Access
Improved ECG based gating in ultra high field cardiac MRI using an independent component analysis approach
© Krug et al; licensee BioMed Central Ltd. 2013
- Published: 30 January 2013
- Independent Component Analysis
- Independent Component
- Cardiac Gating
- Ultra High Field
- Gating Method
Cardiac gating in ultra high field (UHF) MRI is a challenging task due to the magnetohydrodynamic (MHD) effect . The MHD effect is particularly severe at such field strengths and severely distorts the electrocardiogram (ECG). State-of-the-art ECG based gating methods which use the vectorcardiogram (VCG)  are thus prone to errors . This work presents an approach which separates the ECG and the MHD signal using Independent Component Analysis (ICA).
Examples for the different ICs obtained by the FastICA algorithm are depicted in Figs. 1(d)-(f). The automatic identification of the IC representing the R wave was possible in nine of the ten data sets while the 10th data set required manual identification. Regarding the QRS detection, Se and +P of 97% was achieved for all ten data sets, respectively. For the VCG based method, Se was 90% and +P reached only 48%.
An ICA-based gating method has been shown to outperform the state-of-the-art VCG based gating technique for UHF MRI. As with the VCG method, the proposed ICA based method can be applied in real time, since it can be shown that the computation of the demixing matrix does not need to be updated for each new sample. Recent developments of MR safe 12-lead ECG recorders could make this method applicable in clinical practice .
This work was founded by the Federal Ministry of Education (Germany, BMBF, 03IP710) and by the Royal Academy of Engineering (UK).
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.