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The concentric-ring phased-array hyperthermia applicator: problems associated with directly synthesized annular heating patterns

机译:同心环相控阵热疗器:与直接合成的环形加热模式相关的问题

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The authors investigate the synthesis of different size annular patterns and examine the relative intensities produced in the ultrasonic field proximal and distal to the focal plane. Computer simulations using a concentric-ring array are presented and discussed. The size and position of the synthesized annular patterns are varied by adjusting the phase and amplitude of the driving signal to each array element. It is demonstrated that annular patterns need to be larger than a limiting size (R/sub s/) to avoid excessive energy accumulation along the array axis. Analysis and computer simulations demonstrate that smaller size annual patterns (r>or=R/sub s/) are always associated with intense hot spots along the axis (beyond the focal plane). On the other hand, simulated temperature distributions associated with large patterns (r
机译:作者研究了不同尺寸的环形图案的合成,并研究了在焦平面近端和远端的超声场中产生的相对强度。提出并讨论了使用同心环阵列的计算机仿真。通过调节到每个阵列元件的驱动信号的相位和幅度来改变合成环形图案的尺寸和位置。已经证明,环形图案需要大于极限尺寸(R / sub s /),以避免沿阵列轴的过多能量积聚。分析和计算机仿真表明,较小尺寸的年度模式(r>或= R / sub s /)始终与沿轴(超出焦平面)的强烈热点相关。另一方面,与大模式相关的模拟温度分布(r <或= R / sub s /)显示,虽然在周围达到治疗温度,但肿瘤中心温度无法均匀升高。

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