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首页> 外文期刊>Physics in medicine and biology. >Temperature measurement artefacts of thermocouples and fluoroptic probes during laser irradiation at 810 nm.
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Temperature measurement artefacts of thermocouples and fluoroptic probes during laser irradiation at 810 nm.

机译：在810 nm激光辐照期间，热电偶和荧光探针的温度测量伪像。

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摘要

This study examined the artefact induced in temperature measurements made with thermocouples and Luxtron fluoroptic probes in the presence of infrared radiation. Localized heating was created using a continuous-wave, 810 nm diode laser system emitting 2.0 W from a cylindrical diffusing optical fibre, in air, water and an agar-albumin phantom. The temperature was measured every 1.0 s for 10 to 150 s, with both a thermocouple and a Luxtron fluoroptic probe at distances of 2, 3, 4, 5, 6 and 7 mm from the cylindrical diffusing tip. In all cases, the fluoroptic probe recorded a higher temperature than the thermocouple during laser irradiation. The difference in measured temperatures between the Luxtron probe and the thermocouple ranged from 1.6 degrees C to 18.8 degrees C in air, from 0.3 degrees C to 10.2 degrees C in water, and from 1.4 degrees C to 10.1 degrees C in phantom, depending on the distance of the probe from the laser source. The results suggest that in the presence of laser irradiation, self-heating of the Luxtron probe induces a significant artefact in temperature measurements at distances less than 4 mm from the source fibre. As a result, fluoroptic probes may not be suitable for monitoring tissue temperature for treatments when laser irradiation is present if sensors are located close to the fibre tip (<4 mm).
机译：这项研究检查了在红外辐射存在下用热电偶和Luxtron荧光探针进行温度测量时产生的伪影。使用810 nm连续波二极管激光系统在空气，水和琼脂-白蛋白模型中，从圆柱形扩散光纤发射2.0 W的光，以产生局部加热。每隔1.0 s测量一次温度，持续10至150 s，同时使用热电偶和Luxtron荧光探针在距圆柱扩散尖端2、3、4、5、6和7 mm的距离处进行测量。在所有情况下，荧光探针在激光照射期间记录的温度均高于热电偶。 Luxtron探头与热电偶之间的测量温度差在空气中为1.6摄氏度至18.8摄氏度，在水中为0.3摄氏度至10.2摄氏度，在幻像中为1.4摄氏度至10.1摄氏度，具体取决于探头与激光源的距离。结果表明，在存在激光辐射的情况下，Luxtron探针的自热在距源光纤小于4 mm的距离内引起温度测量中的显着伪像。因此，如果传感器位于靠近光纤尖端（<4 mm）的位置，则存在激光照射时，荧光探针可能不适用于监测组织温度以进行治疗。

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