双筛孔式准直器

提出了一种新型的准直器——双筛孔式准直器。利用扫描电子线轰击位于上层的主准直器上的400个呈矩阵排列的方孔中的钨靶，产生400个面积为100mm×10mm的小X线方野，这些方野经下一级准直器(次准直器)的进一步准直后在同中心野面上留下400个5mm×5mm的微野。再以一定的次序控制主次准直器的前后左右移动和电子线的若干个轮次的逐孔扫描，就可以在同中心野面上留下16种组别的微野群，这些微野可以拼凑成任意形状和不同强度分布的射野面。本准直器可以替代和简化已有的适形调强设备，为加速器提供了一种全新的准直器。降低了放疗设备的成本，使适形调强设备，为加速器提供了一种全新的准直器。降低了放疗设备的成本，使适形调强放疗更易于实行。

Dual Sieve-Mesh Collimator

In this paper is advanced a new type of collimator-dual sieve-mesh collimator. Its principle is to use scanned electronic beam to attack 400 matrix-arranged wolfram targets of the square holes on the upper side of the main collimator and created 400 small X-ray fields sized by 10 mm x 10 mm. These X-ray fields will leave on its center 400 smaller X-ray fields sized by 5 mm x 5 mm after being further collimated by a sub-collimator. What's more, 16 different groups of such X-ray fields can be left on the center of the same field by controlling the all-round movement of the main collimator and sub-collimator in proper order and by scanning it round by round and mesh by mesh with electronic beams. It is these ting fields groups that make up various treatment fields with different energy (Dosage). This type of collimator can replace and simplify all other present collimators on accelerators and conformal-intensity modulation radiotherapy equipment. It has advantage of reducing the costs of radio-therapy equipment and making conformal and intensity modulation radiotherapy easier to perform.