Lithotripsy pulse measurement errors due to non-ideal hydrophone and amplifier frequency response

G. Harris
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引用次数: 3

Abstract

To study the potential effects of bandwidth-limited behavior on lithotripsy pulse measurements, the mathematical model for diagnostic-type pulses of G.R. Harris (1989) was modified. Several parameters of a simulated lithotripsy pulse were compared before and after being filtered by hydrophone and amplifier response functions, both separately and in combination. Errors were computed for the peak positive and negative pressures, rise-time, pulse duration, and pulse intensity integral as functions of hydrophone and amplifier bandwidths. Although most of the energy in a shock wave pulse lies at frequencies below a few megahertz, significant errors can occur unless measurement bandwidths are much wider. However, accuracy for the combined response can be maintained at lower bandwidths if the amplifier's cutoff frequency is less than the hydrophone's thickness resonance peak.<>
由非理想水听器和放大器频率响应引起的碎石脉冲测量误差
为了研究带宽限制行为对碎石脉冲测量的潜在影响,对G.R. Harris(1989)的诊断型脉冲的数学模型进行了修正。通过水听器和放大器响应函数分别滤波和联合滤波,比较了模拟碎石脉冲的几个参数。计算了峰值正负压、上升时间、脉冲持续时间和脉冲强度积分作为水听器和放大器带宽的函数的误差。虽然冲击波脉冲中的大部分能量位于几兆赫以下的频率,但除非测量带宽更宽,否则可能会出现重大误差。然而,如果放大器的截止频率小于水听器的厚度共振峰值,则可以在较低带宽下保持组合响应的准确性
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