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Interstitial instrumentation for therapeutic ultrasonic heating: modeling the discrete blood vessels

機譯:用于治療性超聲波加熱的間隙器械:對離散血管進行建模

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Instrumentation for interstitial ultrasound (US) heating is an important emerging technology in thermotherapy of deep seated tumors or those hard to reach by external devices. The instrumentation has special significance in case of radio-and/or chemotherapy resistant lesions. Its efficacy strongly depends on local tissue properties, especially local blood vessels. We evaluate effects of the vessels on temperature distribution elevated from basal by deposition of ultrasound energy. In the proposed model, we take into account several micron diameter vessels in proximity to the US four-applicator array. At large distances from the array, the volume is assigned a modified effective thermal conductivity. Our Finite Element Analysis of the so-defined problem shows that modelling under the assumption of constant, basal temperature across the vessels' lumen leads to erroneous results. The simulations agree best with experiments if fixed nodal temperature is applied at 60% of the lumen. We specify requirements on the array to avoid local underheating that could lead to performance failure of the instrumentation.
機譯:間隙超聲(US)加熱的儀器是深部腫瘤或難以通過外部設備觸及的腫瘤的熱療法中的一項重要新興技術。該儀器在對放射線和/或化療有抵抗性病變的情況下具有特殊意義。其功效在很大程度上取決于局部組織特性,尤其是局部血管。我們通過沉積超聲能量評估血管對從基底升高的溫度分布的影響。在提出的模型中,我們考慮到了靠近美國四應用陣列的幾個微米直徑的血管。在距陣列較遠的位置,為該體積分配了修改后的有效熱導率。我們對這樣定義的問題的有限元分析表明,在假設容器內腔恒定的基礎溫度的情況下進行建模會導致錯誤的結果。如果將固定節點溫度應用到流明的60%,則模擬與實驗最吻合。我們在陣列上規定了要求,以避免局部過熱,該過熱可能導致儀器性能下降。

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