Figure 1

ECG processing of an AF patient in a 1.5T MR. In (b) MR imaging noise is removed. In (c) VMHD is removed & (d) Stroke volume is provided. (e) The ST elevation mean increased by only 2.5%-5% (0.062-0.13mV) between ECGs taken (i) outside MRI and (iii) inside MRI with ECG filtered. (f) The corresponding standard deviations are close (1.4-1.6), showing that the filtered ECG taken in (iii) is very close to the true ECG in (i). VMHD in (iii) was effectively removed, extracting real ECG. (g) 12-lead ECG-gated cardiac cine in a subject whose 4-lead ECG gating failed due to a strong MHD peak voltage which eclipsed the QRS complex.