Medical Physics and Clinical Engineering Department, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK.
Ultrasound Med Biol. 2011 Oct;37(10):1659-66. doi: 10.1016/j.ultrasmedbio.2011.07.003. Epub 2011 Aug 19.
This paper introduces a novel method for measuring the surface temperature of ultrasound transducer membranes and compares it with two standard measurement techniques. The surface temperature rise was measured as defined in the IEC Standard 60601-2-37. The measurement techniques were (i) thermocouple, (ii) thermal camera and (iii) novel infra-red (IR) "micro-sensor." Peak transducer surface measurements taken with the thermocouple and thermal camera were -3.7 ± 0.7 (95% CI)°C and -4.3 ± 1.8 (95% CI)°C, respectively, within the limits of the IEC Standard. Measurements taken with the novel IR micro-sensor exceeded these limits by 3.3 ± 0.9 (95% CI)°C. The ambiguity between our novel method and the standard techniques could have direct patient safety implications because the IR micro-sensor measurements were beyond set limits. The spatial resolution of the measurement technique is not well defined in the IEC Standard and this has to be taken into consideration when selecting which measurement technique is used to determine the maximum surface temperature.
本文介绍了一种测量超声换能器膜表面温度的新方法，并将其与两种标准测量技术进行了比较。表面温升的测量符合 IEC 标准 60601-2-37 的规定。所采用的测量技术包括：（i）热电偶，（ii）热像仪和（iii）新型红外（IR）“微传感器”。热电偶和热像仪测量的换能器表面峰值温度分别为-3.7 ± 0.7（95%置信区间）°C 和-4.3 ± 1.8（95%置信区间）°C，均在 IEC 标准范围内。新型 IR 微传感器的测量值超出了这些限制，达到了 3.3 ± 0.9（95%置信区间）°C。我们的新方法与标准技术之间的不明确性可能会直接影响患者的安全，因为 IR 微传感器的测量值超出了设定的限制。IEC 标准中并未明确定义测量技术的空间分辨率，因此在选择用于确定最大表面温度的测量技术时，必须考虑这一点。
