Saturday, February 14, 2009

Black vs white!

Look at this radiograph. There is a thick black shadow at the bottom of the x-ray. What do you think has happened?

Apparently, while the radiographer was about to pull out an unexposed film from its box in the darkroom, a friend came by and accidentally open the dark room door. The part of the film that was exposed is now fogged. Being a smart radiographer, he continued to use the film but by making sure the fogged part is placed inferiorly. 
Compare this to the well-collimated film below. The collimated portion is unexposed to x-rays and thus (after processing) should be clear.

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