{"title":"Selective focusing through inhomogeneous media: the DORT method","authors":"C. Prada, M. Fink","doi":"10.1109/ULTSYM.1995.495829","DOIUrl":null,"url":null,"abstract":"The DORT method (Decomposition de l'Operateur de Retournement Temporel) applies to ultrasonic detection and focusing with arrays of transducers. It is a signal analysis method based on the invariance of ultrasonic propagation under time reversal. It requires the measurement of the inter element impulse responses of the the propagating medium for all pair of elements in the array. A hermitian matrix called the time reversal operator is deduced from these responses and diagonalized. The eigenvectors are then used to perform selective focusing. This method is applied here to phase aberration correction. Experiments with weakly and strongly aberrating medium are shown.","PeriodicalId":268177,"journal":{"name":"1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium","volume":"11 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1995-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"12","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ULTSYM.1995.495829","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12
Abstract
The DORT method (Decomposition de l'Operateur de Retournement Temporel) applies to ultrasonic detection and focusing with arrays of transducers. It is a signal analysis method based on the invariance of ultrasonic propagation under time reversal. It requires the measurement of the inter element impulse responses of the the propagating medium for all pair of elements in the array. A hermitian matrix called the time reversal operator is deduced from these responses and diagonalized. The eigenvectors are then used to perform selective focusing. This method is applied here to phase aberration correction. Experiments with weakly and strongly aberrating medium are shown.
DORT (Decomposition de l’operateur de Retournement Temporel)方法适用于传感器阵列的超声波检测和聚焦。它是一种基于时间反转下超声波传播不变性的信号分析方法。它要求测量阵列中所有对元的传播介质的元间脉冲响应。从这些响应中推导出一个称为时间反转算子的厄米矩阵并对角化。然后使用特征向量进行选择性聚焦。本文将该方法应用于相位像差校正。给出了弱像差和强像差介质的实验结果。
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