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Longitudinal motion during in vivo pullbacks acquisition of intravascular ultrasound (IVUS) sequences is a major artifact for 3-D exploring of coronary arteries. Most current techniques are based on the electrocardiogram (ECG) signal to obtain a gated pullback without longitudinal motion by using specific hardware or the ECG signal itself. We present an image-based approach for cardiac phase retrieval...
A technique for designing optimized filters by optimizing filter parameters could be used for detecting QRS complexes in electrocardiogram has been discussed. This system includes three stages. A pre amplifier stage, an anti alias filter for filter out unwanted higher frequencies with cutoff frequency 50 Hz and a eighth order Butterworth band pass filter to filter out noises in near desired frequencies...
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