Rényi信息在医学超声中的应用  

Application of Rényi Information in Medical Ultrasound

作　　者：白培瑞[1] 傅颖霞[2] 杨超[3] 

机构地区：[1]山东科技大学信息与电气工程学院,山东青岛266510 [2]山东科技大学资源与环境工程学院,山东青岛266510 [3]海军航空工程学院控制与制导系,山东烟台264001

出　　处：《烟台大学学报（自然科学与工程版）》2010年第1期78-82,共5页Journal of Yantai University(Natural Science and Engineering Edition)

基　　金：山东省自然科学基金资助项目(ZR2009CM032)

摘　　要：医学超声中的脉冲回波信号是多频率成分的宽带信号,采用时频分析方法可以同时从时域和频域定征信号的发散特性和失真.Choi-William分布的R啨nyi信息可以有效表征超声信号的定量信息,将信号复杂度与组织散射结构联系起来.本文研究了超声射频信号的R啨nyi信息在医学超声领域的应用.结果表明,R啨nyi信息可以反映组织结构的散射特性,R啨nyi差分信息则可以反映组织结构或成分的变化程度,而基于R啨nyi信息的DRI方法则可以获取组织结构非均匀性的先验信息.超声射频信号的R啨nyi信息在超声组织定征和超声弹性成像方面具有良好的应用前景.Time-frequency representation of multi-element ultrasonic pulses plays an important role in characterizing the scattering and dispersive effects in time and frequency domain simultaneously. Rényi information of the Choi-William distribution can disclose quantitative complexity of ultrasonic signals, and relate them to tissue structure. The application of Rényi information of radio frequency ultrasonic signals in medical ultrasound is investigated. Experiment results indicate that Rényi information can disclose scattered information of tissue structure, and differential Rényi information can disclose the change of tissue structure or tissue element. Furthermore, apriori information of tissue inhomogeneity can be obtained through DRI method based on Rényi information. It is concluded that Rényi information of radio frequency ultrasonic signals has potential application in ultrasound tissue characteristic and elastography.

关 键 词：时频分布 R啨nyi信息 超声组织定征 超声弹性成像 

分 类 号：R318[医药卫生—生物医学工程]