- Poster presentation
- Open Access
Improved cardiac motion self-gating
© Han et al; licensee BioMed Central Ltd. 2013
- Published: 30 January 2013
- Principle Component Analysis
- Cardiac Motion
- Cine Sequence
- Trigger Detection
- Cardiac Trigger
Cardiac motion self-gating is a technique where MRI signal is used to derive motion triggers instead of ECG, which might be problematic in high B0 field or cases where ECG is not accessible (e.g. fetal cardiac imaging). However, the performance of existing cardiac self-gating approaches have not yet enabled clinical utility. We propose and evaluate here a novel cardiac self-gating strategy that potentially improves the trigger detection accuracy and reliability.
Fig.1b shows the cardiac self-gating signal and trigger generated by the proposed method on the same subject for Fig.1a. Fig.1c&d show the result from a 3T scanner where the quality of ECG is poor while our self-gating method could still provide accurate triggers. Based on data from 8 healthy volunteers, the overall trigger detection rate was 99% (one failed due to non-ideal breath-holding) and the average temporal variability of triggers was ±7.79ms using the ECG as reference. On 3 subjects using the k-space center point only as previously described, the overall detection rate was only 65%.
Our data demonstrates that the proposed cardiac self-gating method can significantly reduce the drift and distortion of the self-gating signal and therefore improve cardiac trigger detection accuracy and reliability. Future work will be focused on implementing the technique in an imaging sequence as Fig.2.
The authors acknowledge research-funding support from AHA (10SDG4200076), NIH (1R21HL113427).
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.