CT-电子密度转换曲线的采集校正及对治疗计划剂量计算的影响
发布时间：2018-07-21 17:59
【摘要】：目的:为提高放疗精度,建立CT-电子密度转换曲线,确定对放射治疗计划剂量计算的影响。方法:利用CT电子密度模体,对模拟定位CT机的CT值进行检测。比较人体不同组织的CT值,建立CT-电子密度转换曲线。根据各组织的相对电子密度对组织不均匀性剂量进行校正,并分析照射剂量MU数值的变化。结果:在同一定位扫描参数下,不同位置的等效密度组织CT值均有变化:高密度组织CT值变化较大,近床面的等效密度组织CT值变化均大于远床面的等效密度组织。不同的CT-电子密度转换曲线其MU数值相差均20%,调强放疗(intensity modulated radiation therapy,IMRT)较大,三维适形放射治疗(3-dimensional conformal radiation therapy,3DCRT)和调强放疗各偏差值相同。结论:对治疗计划系统数据进行采集录入时,应正确合理地输入一条CT-电子密度转换曲线,以保证治疗计划剂量计算的精度。
[Abstract]:Objective: to improve the accuracy of radiotherapy, to establish CT-electron density conversion curve and to determine the effect on dose calculation of radiotherapy plan. Methods: using CT electron density motif, the CT value of simulated location CT machine was detected. The CT values of different tissues were compared and the CT-electron density conversion curve was established. The inhomogeneity dose of tissue was corrected according to the relative electron density of each tissue, and the change of MU value of irradiation dose was analyzed. Results: under the same scanning parameters, the CT values of the equivalent density tissue in different locations were all changed: the CT value of the high-density tissue changed greatly, and the CT value of the near-bed tissue was larger than that of the far-bed tissue. The difference of MU values in different CT-electron density conversion curves was 20. The difference of MU values in intensity modulated radiotherapy (IMRT) was larger than that in intensity modulated radiotherapy (IMRT). The deviations of three dimensional conformal radiotherapy (3-dimensional conformal radiation therapeutic therapy) and intensity modulated radiotherapy (IMRT) were the same. Conclusion: a CT-electron density conversion curve should be inputted correctly and reasonably when collecting and inputting the data of the treatment plan system in order to ensure the accuracy of the dose calculation of the treatment plan.
【作者单位】： 解放军89医院肿瘤放疗科;武警后勤学院附属医院;
【分类号】：R730.55
，
本文编号：2136331
[Abstract]:Objective: to improve the accuracy of radiotherapy, to establish CT-electron density conversion curve and to determine the effect on dose calculation of radiotherapy plan. Methods: using CT electron density motif, the CT value of simulated location CT machine was detected. The CT values of different tissues were compared and the CT-electron density conversion curve was established. The inhomogeneity dose of tissue was corrected according to the relative electron density of each tissue, and the change of MU value of irradiation dose was analyzed. Results: under the same scanning parameters, the CT values of the equivalent density tissue in different locations were all changed: the CT value of the high-density tissue changed greatly, and the CT value of the near-bed tissue was larger than that of the far-bed tissue. The difference of MU values in different CT-electron density conversion curves was 20. The difference of MU values in intensity modulated radiotherapy (IMRT) was larger than that in intensity modulated radiotherapy (IMRT). The deviations of three dimensional conformal radiotherapy (3-dimensional conformal radiation therapeutic therapy) and intensity modulated radiotherapy (IMRT) were the same. Conclusion: a CT-electron density conversion curve should be inputted correctly and reasonably when collecting and inputting the data of the treatment plan system in order to ensure the accuracy of the dose calculation of the treatment plan.
【作者单位】： 解放军89医院肿瘤放疗科;武警后勤学院附属医院;
【分类号】：R730.55
，
本文编号：2136331
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