Minimizing the number of segments in a delivery sequence for intensity-modulated radiation therapy with a multileaf collimator
Minimizing the number of segments in a delivery sequence for intensity-modulated radiation therapy with a multileaf collimator
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DOI：
10.1118/1.1406518
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发表时间：
2001-10-01
期刊：
影响因子：
3.8
通讯作者：
Zhu, YP
中科院分区：
文献类型：
--
作者：
Dai, JR;Zhu, YP
本文提出了一种静态模式下多叶准直器调强放射治疗的排序算法。该算法的目的是最小化的交付序列中的段的数量。对于具有长的验证和记录开销时间的机器（例如，每段15 s），最小化段数就相当于最小化交付时间。所提出的新算法是基于检查一个片段的众多候选人，并选择候选人，结果在一个残差强度矩阵具有最小的复杂性。当存在导致相同复杂度的多个候选时，选择具有最大大小的候选。新算法通过使用已发表的算法获得的传输序列中的段数来测量强度矩阵的复杂性。使用临床强度调制光束测试了所提出的算法的光束传输效率以及用于计算强度矩阵复杂性的不同已发表算法的影响。结果表明，无论采用哪种算法计算强度矩阵的复杂度，本文提出的算法生成的序列总是比采用已发表算法本身生成的序列更有效。计算结果还表明，计算强度矩阵的复杂性的算法影响光束传输的效率。当Bortfeld等人的算法用于计算强度矩阵的复杂性时，递送序列通常是最有效的。因为没有一个单一的变化是最有效的所有光束测试，我们建议实现我们的算法的多种变化。(C)2001年美国医学物理学家协会。
This paper proposes a sequencing algorithm for intensity-modulated radiation therapy with a multileaf collimator in the static mode. The algorithm aims to minimize the number of segments in a delivery sequence. For a machine with a long verification and recording overhead time (e.g., 15 s per segment), minimizing the number of segments is equivalent to minimizing the delivery time. The proposed new algorithm is based on checking numerous candidates for a segment and selecting the candidate that results in a residual intensity matrix with the least complexity. When there is more than one candidate resulting in the same complexity, the candidate with the largest size is selected. The complexity of an intensity matrix is measured in the new algorithm in terms of the number of segments in the delivery sequence obtained by using a published algorithm, The beam delivery efficiency of the proposed algorithm and the influence of different published algorithms used to calculate the complexity of an intensity matrix were tested with clinical intensity-modulated beams. The results show that no matter which published algorithm is used to calculate the complexity of an intensity matrix, the sequence generated by the algorithm proposed here is always more efficient than that generated by the published algorithm itself. The results also show that the algorithm used to calculate the complexity of an intensity matrix affects the efficiency of beam delivery. The delivery sequences are frequently most efficient when the algorithm of Bortfeld et al. is used to calculate the complexity of an intensity matrix. Because no single variation is most efficient for all beams tested, we suggest implementing multiple variations of our algorithm. (C) 2001 American Association of Physicists in Medicine.