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Proceedings Paper

Cardiac phase detection in intravascular ultrasound images
Author(s): Monica M. S. Matsumoto; Pedro Alves Lemos; Takashi Yoneyama; Sergio Shiguemi Furuie
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Paper Abstract

Image gating is related to image modalities that involve quasi-periodic moving organs. Therefore, during intravascular ultrasound (IVUS) examination, there is cardiac movement interference. In this paper, we aim to obtain IVUS gated images based on the images themselves. This would allow the reconstruction of 3D coronaries with temporal accuracy for any cardiac phase, which is an advantage over the ECG-gated acquisition that shows a single one. It is also important for retrospective studies, as in existing IVUS databases there are no additional reference signals (ECG). From the images, we calculated signals based on average intensity (AI), and, from consecutive frames, average intensity difference (AID), cross-correlation coefficient (CC) and mutual information (MI). The process includes a wavelet-based filter step and ascendant zero-cross detection in order to obtain the phase information. Firstly, we tested 90 simulated sequences with 1025 frames each. Our method was able to achieve more than 95.0% of true positives and less than 2.3% of false positives ratio, for all signals. Afterwards, we tested in a real examination, with 897 frames and ECG as gold-standard. We achieved 97.4% of true positives (CC and MI), and 2.5% of false positives. For future works, methodology should be tested in wider range of IVUS examinations.

Paper Details

Date Published: 10 March 2008
PDF: 9 pages
Proc. SPIE 6920, Medical Imaging 2008: Ultrasonic Imaging and Signal Processing, 69200D (10 March 2008); doi: 10.1117/12.769670
Show Author Affiliations
Monica M. S. Matsumoto, Aeronautics Institute of Technology (Brazil)
Heart Institute (InCor), Hospital das Clínicas, Univ. de São Paulo (Brazil)
Pedro Alves Lemos, Heart Institute (InCor), Hospital das Clínicas, Univ. de São Paulo (Brazil)
Takashi Yoneyama, Aeronautics Institute of Technology (Brazil)
Sergio Shiguemi Furuie, Heart Institute (InCor), Hospital das Clínicas, Univ. de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 6920:
Medical Imaging 2008: Ultrasonic Imaging and Signal Processing
Stephen A. McAleavey; Jan D'hooge, Editor(s)

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