Spirou S V, Chui C S
Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.
Med Phys. 1994 Jul;21(7):1031-41. doi: 10.1118/1.597345.
An algorithm, which calculates the motions of the collimator jaws required to generate a given arbitrary intensity profile, is presented. The intensity profile is assumed to be piecewise linear, i.e., to consist of segments of straight lines. The jaws move unidirectionally and continuously with variable speed during radiation delivery. During each segment, at least one of the jaws is set to move at the maximum permissible speed. The algorithm is equally applicable for multileaf collimators (MLC), where the transmission through the collimator leaves is taken into account. Examples are presented for different intensity profiles with varying degrees of complexity. Typically, the calculation takes less than 10 ms on a VAX 8550 computer.
本文提出了一种算法，用于计算生成给定任意强度分布所需的准直器叶片运动。假设强度分布为分段线性，即由直线段组成。在辐射传输过程中，叶片以可变速度单向连续移动。在每一段中，至少有一个叶片被设置为以最大允许速度移动。该算法同样适用于多叶准直器（MLC），其中考虑了通过准直器叶片的透射率。给出了不同复杂度强度分布的示例。通常，在VAX 8550计算机上计算时间不到10毫秒。
