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在立体定向放射治疗时，计算组织内一系列点处吸收剂量的关键是γ光子通量的计算。用蒙特卡罗方法计算点通量的方法有许多种，我们的经验是选用指向概率法，此方法简单、方便。
In stereotactic radiotherapy, the key to calculating the absorbed dose at a series of points in the tissue is the calculation of the gamma photon flux. There are many ways to calculate the point flux with the Monte Carlo method. Our experience is to use the pointing probability method, this method is simple and convenient.