A new method of measuring in vivo sound speed in the reflection mode

✍ Scribed by Nobushige Hayashi; Nagara Tamaki; Michio Senda; Kazutaka Yamamoto; Yoshiharu Yonekura; Kanji Torizuka; Toshio Ogawa; Kageyoshi Katakura; Chinichiro Umemura; Mashio Kodama

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 564 KB
• Volume: 16
• Category: Article
• ISSN: 0091-2751
• DOI: 10.1002/jcu.1870160204

✦ Synopsis

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.