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- Title
Thermal Fields and Thermal Doses in Ultrasonic Surgery: A Model of a Gaussian Focused Beam.
- Authors
Makov, Yu. N.
- Abstract
The condition of equivalence of the space-time distributions of thermal sources in the focal region is introduced for the sources caused by the absorption of focused ultrasonic beams with different aperture amplitude distributions in biological tissue. The Gaussian beam model, which allows the simplest analytical solution of the biothermal equation, is used to obtain fairly accurate approximations in the form of explicit functions describing the spatial distribution and the time dynamics of thermal fields and thermal doses along the beam axis and along the radius in the focal plane. This provides an opportunity to conduct a rapid analysis (without multiple numerical integration) of the results of active surgical (thermodestructive) action of ultrasound on biological tissue and, first of all, to determine the characteristic dimensions of the zone of thermal destruction of biological tissue. The approximate analytical solutions are important for the determination of the effect of the beam parameters (the radius of the aperture and the frequency) on the characteristic dimensions of the zone of thermal destruction.
- Subjects
ULTRASONIC therapy; GAUSSIAN beams
- Publication
Acoustical Physics, 2001, Vol 47, Issue 3, p333
- ISSN
1063-7710
- Publication type
Article
- DOI
10.1134/1.1371591