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放射治療皮膚劑量模擬量測方法

Simulating Measurement of Skin Surface Dose for Radiation Therapy

摘要


為探討病患於放射治療期間皮膚表面劑量的變化,本研究利用不同厚度人體組織填充物(bolus)鋪於圓柱型固態假體(cheese phantom)外層以模擬病患皮膚劑量,bolus的厚度分別為0.3cm、0.5cm、1cm、1.5cm,量測工具為熱發光劑量計TLD 100H。利用不同SAD值下以6MV光子射束照射固態水假體,以1.5cm厚作為最大深度劑量,其增建效益所造成的劑量增益約為3.64±0.08(即最大深度劑量(d(下標 max))/表面劑量(d(下標 s)));然而,以60°、270°的TLD 100H佈點位置在四射束Box技術下所量測的表面劑量,於不同Bolus厚度下表面劑量的平均值分別為108.9±6.1 cGy與109.3±3.4 cGy;而IMRT技術則為135.2±2.1 cGy與136.7±3.3 cGy,IMRT技術所造成的皮膚表面劑量於60°、270°佈點位置較四角度Box技術增加24.2%與25.1%。

並列摘要


This study was to simulate skin dose variation for cancer patients during radiation therapy. We use tissue equivalent materials (bolus) and cheese solid phantom expose to Elekta Synergy accelerator for skin dose evaluation. Different bolus slide (0.3 cm, 0.5 cm, 1 cm, 1.5 cm) attached with TLD 100H at 60° and 270° was irradiated with 6 MV photon in 4 irradiate angles (Box technique) or 7 irradiate angles (IMRT technique). The ratio of measuring dose for 1.5 cm thickness (d(subscript max)) and cheese phantom surface (d(subscript s) is 3.64±0.08 (i.e. d(subscript max)/d(subscript s)). The average surface dose at mark point 60° for Box and IMRT are 108.9±6.1 cGy and 135.2±2.1 cGy; furthermore, the average surface dose at mark point 270° for Box and IMRT are 109.3±3.4 cGy and 136.7±3.3 cGy. Skin surface dose simulating with IMRT are 24.2% and 25.1% higher than that of Box at mark point 60° and 270°, respectively.

並列關鍵字

radiation therapy bolus cheese phantom TLD 100H

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