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A new method of measuring in vivo sound speed in the reflection mode
Author(s) -
Hayashi Nobushige,
Tamaki Nagara,
Senda Michio,
Yamamoto Kazutaka,
Yonekura Yoshiharu,
Torizuka Kanji,
Ogawa Toshio,
Katakura Kageyoshi,
Umemura Chinichiro,
Kodama Mashio
Publication year - 1988
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870160204
Subject(s) - medicine , acoustics , reflection (computer programming) , in vivo , sound (geography) , mode (computer interface) , speed of sound , optics , medical physics , physics , computer science , microbiology and biotechnology , biology , programming language , operating system
This paper describes a new method for in vivo sound measurement in the reflection mode. The mean sound speed between the reflector and linear array transducer is measured using the following three parameters: time of flight, time of flight difference, and distance between two receiver elements. To detect time of flight, the system delay‐line time compensator is adjusted to obtain the sharpest reflector image. This method was evaluated in vivo in human livers, specifically 26 normal, 27 cirrhotic, and 15 fatty livers. The mean sound speed between diaphragm and the transducer was obtained. The measured sound speed was significantly higher in cirrhotic livers and lower in fatty livers.