Hirofumi Taki1, Takuya Sakamoto2, Makoto Yamakawa3, Tsuyoshi Shiina4, Toru Sato2. 1. Graduate School of Informatics, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan. hirofumi.taki@mb6.seikyou.ne.jp. 2. Graduate School of Informatics, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan. 3. Advanced Biomedical Engineering Research Unit, Kyoto University, Kyoto, Japan. 4. Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Abstract
PURPOSE: The purpose of this study is to improve the calcification depiction ability in ultrasonography using correlation of echoes with a modified Wiener filter. METHODS: The waveform of an ultrasound pulse changes when it passes through the location of a calcification. Since the change in echo waveform caused by a calcification decreases the correlation of waveforms in adjacent scan lines, we have proposed a calcification depiction method using the decorrelation of echoes. However, the low signal-to-noise ratio of echoes also decreases the correlation of the echoes. In this study, we employ the correlation of echoes with a modified Wiener filter to suppress the effect of noise, as an indicator of a calcification. RESULTS: The proposed calcification indicator depicted copper cylindrical rods 0.2 mm in size at a depth of 2 cm with a sensitivity of 80% and a positive predictive value of 80%, despite being hardly depicted at all on B-mode ultrasound imaging. CONCLUSION: This study suggests the potential of the proposed method to improve the performance of calcification depiction by ultrasound devices.
PURPOSE: The purpose of this study is to improve the calcification depiction ability in ultrasonography using correlation of echoes with a modified Wiener filter. METHODS: The waveform of an ultrasound pulse changes when it passes through the location of a calcification. Since the change in echo waveform caused by a calcification decreases the correlation of waveforms in adjacent scan lines, we have proposed a calcification depiction method using the decorrelation of echoes. However, the low signal-to-noise ratio of echoes also decreases the correlation of the echoes. In this study, we employ the correlation of echoes with a modified Wiener filter to suppress the effect of noise, as an indicator of a calcification. RESULTS: The proposed calcification indicator depicted copper cylindrical rods 0.2 mm in size at a depth of 2 cm with a sensitivity of 80% and a positive predictive value of 80%, despite being hardly depicted at all on B-mode ultrasound imaging. CONCLUSION: This study suggests the potential of the proposed method to improve the performance of calcification depiction by ultrasound devices.
Entities:
Keywords:
Calcification; Calcification depiction; Decorrelation; Ultrasonography; Wiener filter
Authors: Hirofumi Taki; Kousuke Taki; Takuya Sakamoto; Makoto Yamakawa; Tsuyoshi Shiina; Toru Sato Journal: Annu Int Conf IEEE Eng Med Biol Soc Date: 2010
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