Title :
An accurate method for measuring complex acoustic impedance of biological tissues using an impedance transformer
Author :
Takigawa, Hirotsugu ; Furumoto, Yousuke ; Hatakeyama, Rokuro ; Tagawa, Norio ; Moriya, Tadashi
Author_Institution :
Dept. of Electr. Eng., Tokyo Metropolitan Univ., Japan
Abstract :
By measuring the characteristic impedance of tissues, we can differentiate between various types of biological tissue. This capability may lead to early diagnosis of cancer and other diseases that cause changes in the characteristic impedance of tissues. We have developed a new method for measuring the characteristic impedance of biological tissues. However, the accuracy of this method was found to be insufficient for differentiating between tissues that are only subtly different. Therefore, a new impedance transformer was developed which enables accurate measurement of biological samples. The present paper describes a method for measuring complex acoustic impedance of biological tissues using an impedance transformer
Keywords :
acoustic impedance; bioacoustics; biological tissues; biomedical measurement; biomedical transducers; biomedical ultrasonics; ultrasonic velocity measurement; Smith chart; accurate measurement method; biological tissues; characteristic impedance; complex acoustic impedance; early cancer diagnosis; equivalent circuit; impedance transformer; longitudinal wave reflection; Acoustic devices; Acoustic measurements; Acoustic reflection; Biological tissues; Cancer; Impedance measurement; Performance evaluation; Reflectivity; Surface impedance; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849251
