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很多进口B超机使用Polaroid相机,进口Polaroid片具有清晰度高、使用简便的特点,受到广大影象医学工作者的欢迎。但Polaroid片普遍存在有效期较短,一般一年左右。过期的Polaroid片如果按原来的正常曝光时间、光圈时,则往往得不到预期的效果。本文介绍如何使用过期的Polaroid片的方法。 过期的Polaroid片,一种是药袋内的药液干枯、硬结,这种片只好报废了;另一种则是药袋内药液完好,则可以继续使用。Polaroid片过期后,感光度则降低。如667片感光度为ISO3000/36°可以降一至二级甚至三级使用(ISO11600/33°、ISO400/30°或ISO400/27°)。方法如下:
Many imported B-machine using Polaroid camera, imported Polaroid film with high definition, easy to use features, by the majority of imaging medical workers welcome. However, Polaroid tablets are generally valid for a short period, usually about a year. Expired Polaroid film if the original normal exposure time, aperture, you often can not get the desired results. This article describes how to use expired Polaroid slices. Expired Polaroid tablets, one is the medicine bag inside the liquid dry, induration, this piece had to scrapped; the other is the medicine bag in good condition, you can continue to use. After the Polaroid expires, the sensitivity decreases. If the 667 sensitivity ISO3000 / 36 ° can be reduced to one or two or even three levels (ISO11600 / 33 °, ISO400 / 30 ° or ISO400 / 27 °). Methods as below: