Abstract
Purpose
The purpose of this study is to propose a novel method to depict small calcifications in ultrasound B-mode images using decorrelation of forward scattered waves with no decrease in the frame rate.
Methods
Since the waveform of an ultrasound pulse changes when it passes through a calcification location, the echo waveform from regions behind the calcification is quite different from that without a calcification. This indicates that the existence of a calcification is predictable based upon the waveform difference between adjacent scan lines by calculating cross-correlation coefficients. In addition, a high-intensity echo should return from the calcification itself. Therefore, the proposed method depicts the high-intensity echo positions with posterior low correlation coefficient regions.
Results
Eleven of 15 wires 0.2–0.4 mm in diameter were depicted using this method, yielding a sensitivity of 73.3% and a specificity of 100%, even though they might go undetected under clinical inspection of ultrasound B-mode images.
Conclusion
This study suggests that an US device could perform well in terms of calcification detection.
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Acknowledgments
This work is partly supported by the Research and Development Committee Program of the Japan Society of Ultrasonics in Medicine and the Innovative Techno-Hub for Integrated Medical Bio-imaging Project of the Special Coordination Funds for Promoting Science and Technology from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
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Taki, H., Sakamoto, T., Yamakawa, M. et al. Small calcification depiction in ultrasound B-mode images using decorrelation of echoes caused by forward scattered waves. J Med Ultrasonics 38, 73–80 (2011). https://doi.org/10.1007/s10396-011-0298-7
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DOI: https://doi.org/10.1007/s10396-011-0298-7