双拓补式准直器

摘要

用两个以放射源为中心的上边开有许多小方孔的铅制球台作准直器，利用扫描电子线的打靶在第一个准直器上击出若干个X线分野，然后用另一个准直器把这些分野再进一步分成更细小的微野，这些野元就可以拼凑出各式各样的，强度可以不均的照射野面来。这种设备可以替代现有的多叶光栏和其它类别的准直器，使适形放疗更加易于实现。%Dual Copy-Supplement Collimator consists of two lead conicsections centered on one common radioactive source and having a lot of small square holes on them.When scanning electron beams strike X-Ray target and create some X-Ray fields while passing through the primary section,they penetrate the secondary section and generate even smaller field units(FU).Using thess FUs would compose various treatment fields with different energy (dosage).It is able not only to replace many existing collimators such as MLC,but also to make the conformal radiotherapy easier.