Assessment of regional myocardial strain by a novel automated tracking system from digital image files

Tomohiko Toyoda, Hirotaka Baba, Takashi Akasaka, Maki Akiyama, Yoji Neishi, Junko Tomita, Renan Sukmawan, Yuji Koyama, Nozomi Watanabe, Satoshi Tamano, Ryuichi Shinomura, Issei Komuro, Kiyoshi Yoshida

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


Myocardial strain imaging by Doppler tissue echocardiography is a useful method to quantify regional left ventricular function. However, this method has a problem of its Doppler angle dependency. We attempted to quantify myocardial strain by a newly developed automated tracking system from digital image files. In 6 anesthetized open-chest dogs, a pair of ultrasonic crystals was implanted at the inner site and outer site of the left ventricular wall to measure myocardial radial strain. B-mode echocardiographic images and trajectories of crystals were recorded simultaneously. Three conditions were examined by intravenous infusion of dobutamine. We used a pattern matching algorithm, which allowed us to track objects from one frame to the next. In 18 image sequences obtained in the 6 dogs, there was an excellent correlation in maximal myocardial strain between the two methods (r = 0.92, P <. 0001). Thus, this system is a promising tool to provide automated quantification of regional myocardial strain.

Original languageEnglish
Pages (from-to)1234-1238
Number of pages5
JournalJournal of the American Society of Echocardiography
Issue number12
Publication statusPublished - Dec 2004


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