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arXiv 1809.06308physics.med-ph
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一种新的标准二次优化方法用于固定野调强放射治疗的射束角度优化

A new standard quadratic optimization approach to beam angle optimization for fixed-field intensity modulated radiation therapy

Junbo Peng, Ailin Wu, Lei Zhu

摘要:

射束角度优化在很大程度上决定了固定野调强放射治疗(IMRT)的效果,通常被认为是一个非凸优化问题,是一个NP难问题。在这项工作中,BAO被重新制定成一个高效的标准二次优化框架。每个入射场的子束强度的最大值作为指示是否已选择一个辐射场的替代变量。通过将目标函数中的最大值转化为一组线性约束,通过重新加权l1-范数方案将问题转化为标准二次优化问题。已在数字体模和两名患者上验证了申报BAO的性能。并得出结论:所提出的凸优化框架能够找到射束角度的最佳集合,从而导致固定场IMRT中的OAR上的改进的剂量节省。

英文摘要:

Beam angle optimization (BAO) largely determines the performance of fixed-field intensity modulated radiation therapy (IMRT), and it is usually considered as non-convex optimization and an NP hard problem. In this work, BAO is reformulated into a highly efficient framework of standard quadratic optimization. The maximum of beamlet intensities for each incident field as the surrogate variable indicating whether one radiation field has been selected. By converting the function of maximum value in the objective into a set of linear constraints, the problem is solved as standard quadratic optimization via reweighting l1-norm scheme. The performance of the proposed BAO has been verified on a digital phantom and two patients. And the conclusion is drawn: the proposed convex optimization framework is able to find an optimal set of beam angles, leading to improved dose sparing on OARs in fixed-field IMRT.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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