Changes

In '''projectional radiography ("X-ray") of the thorax''' (chest), the estimated [[geometric magnification]] factor is generally between 1.05 and 1.40,<ref>{{cite web|title=Implementation of unsharpness and noise into the model of the imaging system: Applications to chest and lumbar spine screen-film radiography|url=https://www.diva-portal.org/smash/get/diva2:327957/FULLTEXT01.pdf|author=M Sandborg, D R Dance, and G Alm Carlsson|website=Faculty of Health Sciences, Linköping University}} Report 90. Jan. 1999. ISRN: LIU-RAD-R-090</ref> meaning that measurements made in the image will be this much larger than the real distance in the patient. Therefore, compare to other structures (such as pleural fluid reaching half way to hilar level) where possible rather than giving numbers.