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Effects of phase aberration on tissue heat generation andtemperature 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 heatingnpatterns and steady-state temperature distributions are investigatednanalytically for continuous-wave therapeutic ultrasound using anrandom-phase screen model. Formulas for the statistical moments of thenon-axis heat distribution, total heat deposited in a target volume, andnaxial temperature elevation are derived. Based on the statisticalnmoments, we propose figures of merit to quantitatively assessntherapeutic performance for a range of experimental parameters. Thenanalysis relates statistical properties of the aberrator to those ofnheat generation in tissue. The mean on-axis heat distribution isnsubstantially reduced in the focal zone, while its variance is increasednat other axial positions. The amount of heat delivered to a targetnvolume depends on the location of the target and the size of the volume.nCompared to the results for homogeneous media, the greatest reduction inntemperature increase occurs in the focal zone. Distortions in thentemperature elevation patterns are greatest when the perfusion in tissuenis large
机译:使用随机相位屏蔽模型,对连续波治疗性超声进行了解析研究,研究了非均匀传播介质对组织加热模式和稳态温度分布的影响。推导了非线性热分布,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。基于统计量,我们提出了用于量化评估一系列实验参数的治疗效果的指标。然后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显着减少,而其方差在其他轴向位置上却增加。传递到目标体积的热量取决于目标的位置和体积的大小。n与均匀介质的结果相比,最大的降低温度发生在焦点区域。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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