Usefulness of Myocardial Velocity Gradient Derived from Two-Dimensional Tissue Doppler Imaging as an Indicator of Regional Myocardial Contraction Independent of Translational Motion Assessed in Atrial Septal Defect

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Acknowledgements

We are indebted to Nobuo Yamazaki, BS, Akihiro Sano, MS, and Tetsuya Kawagishi, MS, Toshiba Corporation, for the development of the computer software used in this study. We also thank Norio Tanaka, BS, for his excellent technical assistance and helpful comments.

This study was supported in part by a Grant-in-Aid for Scientific Research (08670841) from the Ministry of Education, Science, and Culture, Tokyo, Japan.

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