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CT 检查是现代化医院中的最先进的设备之一。现在,新型高压水银灯、石英碘灯的研制已使 CT 扫描获得了新的应用。高压水银灯内装有两个电极,是一种依靠在电离水银蒸汽中的两个电极间产生的电弧而发光的照明装置。其内的水银蒸气的压力为2～8个大气压。石英碘灯内装有钨丝,充入含有碘蒸气的惰性气体。它们都是在城市中获得广泛应用的强光源。在充入水银或含碘的惰性气体之前,需要先抽出其中的空气,然后进行置换。本底真空度一般应达到10~(-3)～10~(-4)Pa。
CT examination is one of the most advanced equipment in a modern hospital. Now, the development of a new high-pressure mercury lamp and quartz iodine lamp has made CT scanning a new application. The high-pressure mercury lamp houses two electrodes, a lighting device that glows by relying on an arc created between two electrodes in ionized mercury vapor. The mercury vapor pressure is 2 ~ 8 atm. Quartz iodine lamp is equipped with tungsten wire, filled with inert gas containing iodine vapor. They are all strong light sources that are widely used in the cities. Before filling with inert gas containing mercury or iodine, you need to extract the air and replace it. The background vacuum should generally reach 10 ~ (-3) ~ 10 ~ (-4) Pa.