40兆赫血管内超声射频信号的分形维数
Fractal dimension of 40 MHz intravascular ultrasound radio frequency signals.
作者信息
Santos Filho E, Saijo Y, Tanaka A, Yambe T, Yoshizawa M
机构信息
Department of Medical Engineering and Cardiology, Institute of Development, Aging, and Cancer, Tohoku University, 4-1 Seiryomachi, Aoba-ku, Sendai 980-8575, Japan.
出版信息
Ultrasonics. 2008 Mar;48(1):35-9. doi: 10.1016/j.ultras.2007.08.006. Epub 2007 Nov 7.
OBJECTIVE
Fully automatic tissue characterization in intravascular ultrasound systems is still a challenge for the researchers. The present work aims to evaluate the feasibility of using the Higuchi fractal dimension of intravascular ultrasound radio frequency signals as a feature for tissue characterization.
METHODS
Fractal dimension images are generated based on the radio frequency signals obtained using mechanically rotating 40 MHz intravascular ultrasound catheter (Atlantis SR Plus, Boston Scientific, USA) and compared with the corresponding correlation images.
CONCLUSION
An inverse relation between the fractal dimension images and the correlation images was revealed indicating that the hard or slow moving tissues in the correlation image usually have low fractal dimension and vice-versa. Thus, the present study suggests that fractal dimension images may be used as a feature for intravascular ultrasound tissue characterization and present better resolution then the correlation images.
目的
对于研究人员而言，血管内超声系统中的全自动组织表征仍是一项挑战。当前工作旨在评估将血管内超声射频信号的 Higuchi 分形维数用作组织表征特征的可行性。
方法
基于使用机械旋转的 40 MHz 血管内超声导管（美国波士顿科学公司的 Atlantis SR Plus）获得的射频信号生成分形维数图像，并与相应的相关图像进行比较。
结论
分形维数图像与相关图像之间呈现出反比关系，这表明相关图像中硬的或移动缓慢的组织通常具有低分形维数，反之亦然。因此，本研究表明分形维数图像可用作血管内超声组织表征的一个特征，并且比相关图像具有更好的分辨率。
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