Title :
Relationship between micro- and macro-acoustic properties of myocardium
Author :
Saijo, Yoshifumi ; Sasaki, Hidehiko ; Okawai, Hiroaki ; Nitta, Shin-ichi
Author_Institution :
Dept. of Med. Eng. & Cardiology, Tohoku Univ., Sendai, Japan
fDate :
31 Oct-3 Nov 1996
Abstract :
The objective of the present study is to assess the relationship between micro- and macro-acoustic properties of myocardium. The values of ultrasonic attenuation and sound speed of the myocardium at 3.5 MHz were obtained by frequency domain analysis of the pulse response in order to determine the macro-acoustic properties. The micro-acoustic properties were obtained by a specially developed scanning acoustic microscope system operating in the frequency range of 100-200 MHz. At 3.5 MHz, the sound speed was 1600 m/s and the attenuation was 2.5 dB/cm in the normal myocardium, 1582 m/s and 5.8 dB/cm in the necrosis, respectively. At 130 MHz, both values were 1614 m/s and 1.1 dB/mm/MHz in the normal myocardium, 1578 m/s and 0.6 dB/mm/MHz in the necrosis, respectively. The results suggest that the ultrasonic attenuation is affected by both the chemical components and the structure of the tissue
Keywords :
acoustic microscopy; acoustic signal processing; bioacoustics; echocardiography; frequency-domain analysis; medical signal processing; muscle; ultrasonic absorption; ultrasonic velocity; 100 to 200 MHz; 130 MHz; 1578 m/s; 1582 m/s; 1600 m/s; 1614 m/s; 3.5 MHz; absolute values; amplitude images; echographic images; frequency domain analysis; macro-acoustic properties; micro-acoustic properties; myocardium; necrosis; phase images; pulse response; scanning acoustic microscope system; sound speed; tissue chemical components effect; tissue structure effect; ultrasonic attenuation; Acoustic measurements; Attenuation; Biological tissues; Biomedical optical imaging; Frequency; Myocardium; Optical attenuators; Optical microscopy; Signal processing; Ultrasonic variables measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 1996. Bridging Disciplines for Biomedicine. Proceedings of the 18th Annual International Conference of the IEEE
Conference_Location :
Amsterdam
Print_ISBN :
0-7803-3811-1
DOI :
10.1109/IEMBS.1996.652013