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深部治疗X线管多在阳极外面加上一个放射屏罩,X线出口处有一个钼窗,所以从外边看不到钨靶。焦点好坏只能用针孔摄影法进行检查(见图)。我们在使用新管时都要给焦点照个像,保存在机器档案中;每月测线量时也要给焦点照个像,作为常规检查。焦点损坏时在管电流和管电压表上是看不出来的,往往要过一个时期发现所用量与皮肤反应肿瘤消退情况不符,这时检查焦点才发现已坏,输出量降低,那么焦点为什么会损坏的呢?据我们多年的使用经验,有以下几种情形。
Deep treatment of X-ray tube in the anode plus a radiation shield, the X-ray exit there is a molybdenum window, so from the outside can not see the tungsten target. The focus is good or bad can only be pinhole photography (see photo). We use the new tube should be given a photo of the focus, stored in the machine file; the amount of monthly survey line should also take a photo, as a routine examination. Focus on damage in the tube current and tube voltage meter is not seen, often over a period of time to find the amount of skin reaction with tumor regression disappeared, then check the focus was found to have been bad, the output decreased, then why the focus will be Damaged? According to our many years of experience, the following situations.