The monopole-source solution for estimating tissue temperatureincreases for focused ultrasound fields

摘要

The monopole-source solution to the problem of estimating tissuentemperature rise generated by a focused ultrasound beam is presented.nThe acoustic pressure field generated by a focused, continuous-wavenultrasound source using the acoustic monopole-source method isndeveloped. The point-source solution to the linear bio-heat transfernequation is used to calculate the axial, steady-state temperaturenincrease for both circular and rectangular apertures. The results of thencircular aperture are compared with the temperature increase calculatednusing the heated-disc method and are shown to be in substantialnagreement. Finally, the temperature increase generated by the circularnaperture is compared to that of the rectangular aperture for the samensource power, aperture surface area, operating frequency, and mediumnproperties, and it is shown that the rectangular source generatesntemperature increases less than those of the circular source under thesenconditions