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Computer Simulation and Measurement of the Ultrasound Field in a Bounded Plane

Computer simulation, if accurate enough, can substitute digital measurements in situations where it is difficult and inconvenient to perform measurements. A good example of such a situation are ultrasound field measurements within the human brain, which occur during ultrasonic brain cancer surgery. The simulation was based on the virtual source model, which ensured accuracy. The source of ultrasound has been described by its position and directivity characteristics. The medium has been described by its absorption coefficient and the velocity of sound in the medium. The reflective surfaces have been described by their geometry and absorption coefficient. The correctness of the mathematical interpretation used in the simulation was checked by measurements on a scaled model specially designed for research. The characteristics of the model were similar to those of the bounded plain. The comparison of the results of the simulation and the measurements on the model confirmed the quality of the computer simulation. Finally, the distribution of acoustic fields in the human cranium was simulated.

ultrasound; simulation; sound pressure level; neurosurgery

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