Theoretical study of temperature elevation at muscle/bone interface during ultrasound hyperthermia

This paper examines the distributions of the SAR (specific absorption rate) ratio and temperature elevation when an ultrasound beam propagates through the interface of muscle and bone. This interface is regarded as a flat boundary to partition the energy of the ultrasound beam, and the analytical so...

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Bibliographic Details
Published in:Medical physics (Lancaster) 2000-05, Vol.27 (5), p.1131-1140
Main Authors: Lin, Win-Li, Liauh, Chihng-Tsung, Chen, Yung-Yaw, Liu, Hwa-Chang, Shieh, Ming-Jium
Format: Article
Language:English
Subjects:
absorbed power deposition
Acoustic wave attenuation
Acoustic waves
Acoustics
Biological effects of ultrasound, ultrasonic tomography
Biomedical Engineering
biomedical ultrasonics
Biophysical Phenomena
Biophysics
Biothermics and thermal processes in biology
bone
Bone and Bones - physiopathology
Energy transfer
High temperature acoustics
Humans
hyperthermia
Models, Biological
muscle
muscle/bone interface
Muscles
Muscles - physiopathology
Neoplasms - physiopathology
Neoplasms - therapy
Physicists
radiation therapy
Temperature
temperature distribution
temperature elevation
Therapeutic applications
Ultrasonic attenuation
Ultrasonic Therapy - methods
Ultrasonography
ultrasound hyperthermia
Wave attenuation
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Summary:This paper examines the distributions of the SAR (specific absorption rate) ratio and temperature elevation when an ultrasound beam propagates through the interface of muscle and bone. This interface is regarded as a flat boundary to partition the energy of the ultrasound beam, and the analytical solution of temperature distribution is based on the steady-state bio-heat transfer equation. The parameters considered are the incident angle of ultrasound beam, the ultrasound frequency, the acoustic attenuation coefficients of refracted longitudinal and shear waves in bone, and the blood perfusion in muscle. The results show that the peak of the SAR ratio is always at the interface of muscle and bone, while the peak of temperature is located in the bone region beyond the interface. A muscle with lower perfusion or a bone with higher acoustic attenuation results in the shifting of the temperature peak closer to the interface. It is more difficult to heat a higher perfused muscle in front of a bone using a lower frequency ultrasound since the temperature elevation for bone relative to muscle is greater.
ISSN:0094-2405
2473-4209
DOI:10.1118/1.598979