AN ULTRASOUND SYSTEM FOR LOCAL HYPERTHERMIA USING SCANNED FOCUSED TRANSDUCERS
AN ULTRASOUND SYSTEM FOR LOCAL HYPERTHERMIA USING SCANNED FOCUSED TRANSDUCERS
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DOI：
10.1109/tbme.1984.325378
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发表时间：
1984-01-01
影响因子：
4.6
通讯作者：
DICKINSON, RJ
中科院分区：
文献类型：
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作者：
DICKINSON, RJ
组织加热的计算机模拟用于检查扫描肿瘤的聚焦超声换能器产生的加热模式。结果表明，需要大面积换能器才能在深度处提供优先加热，并且加热模式不是由焦点体积的路径给出的。使用考虑了热剂量的估计来研究通过脉冲或扫描随时间改变加热模式的效果。热损伤对温度的非线性依赖性，并且发现温度波动往往会降低治疗率，因此应避免。讨论了这些结果对超声加热系统设计的影响。
A computer simulation of tissue heating is used to examine the heating pattern produced by a focused ultrasound transducer scanned over the tumor. It is shown that, a large area transducer is required to give preferential heating at depth and the heating pattern is not given by the path of the focal volume. The effect of varying the heating pattern with time by pulsing or scanning is investigated using an estimate of thermal dose which takes into account the. nonlinear dependence of heat damage on temperature, and it is found that temperature fluctuations tend to reduce the therapeutic ratio and so should be avoided. The implications of these results on the design of ultrasound heating systems are discussed.