Image-based cardiac phase retrieval in intravascular ultrasound sequences.
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 from coronary IVUS sequences without an ECG signal. A signal reflecting cardiac motion is computed by exploring the image intensity local mean evolution. The signal is filtered by a band-pass filter centered at the main cardiac frequency. Phase is retrieved by computing signal extrema. The average frame processing time using our setup is 36 ms. Comparison to manually sampled sequences encourages a deeper study comparing them to ECG signals.
Computer Vision Center and Department of Computer Science, Universitat Autonoma de Barcelona, Bellaterra, Spain. aura,debora@cvc.uab.cat
Aura
A
Hernàndez-Sabaté
Debora
D
Gil
Jaume
J
Garcia-Barnés
Enric
E
Martí
D000465:Algorithms; D016477:Artifacts; D004562:Electrocardiography; D006321:Heart / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D009068:Movement; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D018084:Ultrasonography, Interventional / Q000379:methods*