Samaras T, van Rhoon G C, Sahalos J N
Department of Physics, Aristotle University of Thessaloniki, GR-54006 Thessaloniki, Greece.
Int J Hyperthermia. 2002 Sep-Oct;18(5):416-25. doi: 10.1080/02656730210132039.
This work presents the results obtained from simple numerical models concerning the measurement uncertainty with thermographic techniques used for the evaluation of superficial hyperthermia applicators. Based upon the calculations performed, it is shown that, when using a thermographic technique to measure the SAR distribution of an applicator, heating times from 60-120s and measuring times of 10s are acceptable for an accurate assessment of the half-width at half power (HWHP) of an applicator (error less than 2%) with an expected HWHP larger than 2.5 cm. Only when the HWHP is expected to be less than 2.5 cm does the heating time need to be adapted to obtain an accuracy of 2% or better. For the assessment of the maximum SAR, the situation is worse. Even with a careful experimental design, it is difficult to measure the maximum SAR with an error less than 7%.
这项工作展示了从简单数值模型中获得的结果，这些模型涉及用于评估浅表热疗施源器的热成像技术的测量不确定度。基于所进行的计算表明，当使用热成像技术测量施源器的比吸收率（SAR）分布时，对于预期半高宽（HWHP）大于2.5厘米的施源器，60 - 120秒的加热时间和10秒的测量时间对于准确评估其半高宽（误差小于2%）是可以接受的。只有当预期半高宽小于2.5厘米时，才需要调整加热时间以获得2%或更好的精度。对于最大比吸收率（SAR）的评估，情况更糟。即使进行了精心的实验设计，也很难将最大比吸收率测量的误差控制在小于7%。
