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• W2068184572 startingPage "441" @default.
• W2068184572 abstract "Knowledge of the spatial distribution of intensity loss from an ultrasonic beam is critical for predicting lesion formation in focused ultrasound (US) surgery (FUS). To date, most models have used linear propagation models to predict intensity profiles required to compute the temporally varying temperature distributions used to compute thermal dose contours. These are used to predict the extent of thermal damage. However, these simulations fail to describe adequately the abnormal lesion formation behaviour observed during ex vivo experiments in cases for which the transducer drive levels are varied over a wide range. In such experiments, the extent of thermal damage has been observed to move significantly closer to the transducer with increased transducer drive levels than would be predicted using linear-propagation models. The first set of simulations described herein use the KZK (Khokhlov-Zabolotskaya-Kuznetsov) nonlinear propagation model with the parabolic approximation for highly focused US waves to demonstrate that both the peak intensity and the lesion positions do, indeed, move closer to the transducer. This illustrates that, for accurate modelling of heating during FUS, nonlinear effects should be considered. Additionally, a first order approximation has been employed that attempts to account for the abnormal heat deposition distributions that accompany high transducer drive level FUS exposures where cavitation and boiling may be present. The results of these simulations are presented. It is suggested that this type of approach may be a useful tool in understanding thermal damage mechanisms." @default.
• W2068184572 created "2016-06-24" @default.
• W2068184572 creator A5050772942 @default.
• W2068184572 creator A5071097305 @default.
• W2068184572 creator A5077565938 @default.
• W2068184572 date "2000-03-01" @default.
• W2068184572 modified "2023-10-16" @default.
• W2068184572 title "The intensity dependence of lesion position shift during focused ultrasound surgery" @default.
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• W2068184572 doi "https://doi.org/10.1016/s0301-5629(99)00161-1" @default.
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