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Effects of phase aberration on tissue heat generation and temperature elevation using therapeutic ultrasound

机译:使用治疗性超声波的相差对组织发热和温度升高的影响

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The effects of inhomogeneous propagation media on tissue heating patterns and steady-state temperature distributions are investigated analytically for continuous-wave therapeutic ultrasound using a random-phase screen model. Formulas for the statistical moments of the on-axis heat distribution, total heat deposited in a target volume, and axial temperature elevation are derived. Based on the statistical moments, we propose figures of merit to quantitatively assess therapeutic performance for a range of experimental parameters. The analysis relates statistical properties of the aberrator to those of heat generation in tissue. The mean on-axis heat distribution is substantially reduced in the focal zone, while its variance is increased at other axial positions. The amount of heat delivered to a target volume depends on the location of the target and the size of the volume. Compared to the results for homogeneous media, the greatest reduction in temperature increase occurs in the focal zone. Distortions in the temperature elevation patterns are greatest when the perfusion in tissue is large.
机译:对于非均匀传播介质对组织加热模式和稳态温度分布的影响,使用随机相位屏蔽模型对连续波治疗性超声进行了分析性研究。推导出轴上热分布,在目标体积中沉积的总热量和轴向温度升高的统计矩的公式。基于统计时刻,我们提出了品质因数,以定量评估一系列实验参数的治疗效果。该分析将畸变器的统计特性与组织中发热的统计特性相关联。平均轴向热分布在焦点区域中显着减小,而其方差在其他轴向位置处增大。传递到目标体积的热量取决于目标的位置和体积的大小。与均匀介质的结果相比,焦点区域的温度升高幅度最大。当组织中的灌注较大时,温度升高模式的失真最大。

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