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目的：颅内病灶常常是不规则的或体积较大，传统Ｘ－刀系统需采用多个等中心达到覆盖靶灶的目的，但使靶灶内剂量分布不均一，而且计划、治疗难。本文比较了微型多叶光栅系统与传统Ｘ－刀系统在剂量分布上的不同。材料和方法：取颅内球形、不规则形病灶，分别使用微型多叶光栅系统与传统Ｘ－刀系统制定治疗计划，通过ＤＶＨ，ＲＴＯＧ的放射外科指标ｃｏｖｅｒａｇｅ，ＨＩ，ＣＩ进行计划评价。结果：从ＤＶＨ和ＲＴＯＧ的３项指标表明，对于小球形靶灶，微型多叶光栅系统与传统Ｘ－刀系统差别不大；不规则形病灶，微型多叶光栅系统比传统Ｘ－刀系统更有优势，使用５－７个射束即可以有较好的剂量分布。结论：微型多叶光栅系统作为直线加速器放射外科的一种方法，比传统Ｘ－刀系统有更好的剂量分布，靶灶内部剂量均匀，剂量线适形好，并且计划、治疗简单。
OBJECTIVE: Intracranial lesions are often irregular or bulky. Traditional X-knife systems require multiple centers to cover the target lesion. However, the dose distribution in the target lesion is not uniform, and planning and treatment are difficult. This article compares the differences in dose distribution between a micro-leaflet grating system and a conventional X-knife system. MATERIAL AND METHODS: Intracranial spondylolysis and irregular shaped lesions were taken. The treatment plans were set up using micro-lobular raster system and traditional X-knife system respectively. The planned evaluation was made through the radiosurgery coverage, HI and CI of DVH and RTOG. Results: The three indexes of DVH and RTOG showed that the microscopic multileaf raster system has little difference with the traditional X-knife system for the small spherical target stove; the irregular multi-lobes raster system is more than the traditional X-knife system There are advantages, using 5-7 beams that can have a better dose distribution. CONCLUSION: Micro-leaflet grating system, as a method of radiosurgery for linear accelerator, has better dose distribution than traditional X-knife system, uniform dose inside target stove, good conformal dose line, and simple planning and treatment.