超声束强度的红外热成像定量估计。实验验证。
Quantitative estimation of ultrasound beam intensities using infrared thermography-Experimental validation.
机构信息
Center for Devices and Radiological Health, U.S. Food and Drug Administration, 10993 New Hampshire Avenue, Silver Spring, Maryland 20993, USA.
出版信息
J Acoust Soc Am. 2012 Jun;131(6):4283-91. doi: 10.1121/1.4711006.
Infrared (IR) thermography is a technique that has the potential to rapidly and noninvasively determine the intensity fields of ultrasound transducers. In the work described here, IR temperature measurements were made in a tissue phantom sonicated with a high-intensity focused ultrasound (HIFU) transducer, and the intensity fields were determined using a previously published mathematical formulation relating intensity to temperature rise at a tissue/air interface. Intensity fields determined from the IR technique were compared with those derived from hydrophone measurements. Focal intensities and beam widths determined via the IR approach agreed with values derived from hydrophone measurements to within a relative difference of less than 10%, for a transducer with a gain of 30, and about 13% for a transducer with a gain of 60. At axial locations roughly 1 cm in front (pre-focal) and behind (post-focal) the focus, the agreement with hydrophones for the lower-gain transducer remained comparable to that in the focal plane. For the higher-gain transducer, the agreement with hydrophones at the pre-focal and post-focal locations was around 40%.
红外（IR）热成像技术具有快速、非侵入性地确定超声换能器强度场的潜力。在本文描述的工作中，对高强度聚焦超声（HIFU）换能器声处理的组织体模进行了 IR 温度测量，并使用先前发表的数学公式将强度与组织/空气界面的温升相关联来确定强度场。通过 IR 技术确定的强度场与通过水听器测量得出的强度场进行了比较。IR 方法确定的焦点强度和波束宽度与水听器测量值得出的值相差不到 10%，增益为 30 的换能器和增益为 60 的换能器相差约 13%。在距焦点前（预焦）和后（后焦）约 1 厘米的轴向位置，对于低增益换能器，与水听器的一致性与焦平面内的一致性相当。对于高增益换能器，在预焦和后焦位置与水听器的一致性约为 40%。
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