Foil filters for equalized chest radiography.
Variable-thickness filters made of foil are easy to construct, can be fashioned into almost any shape, and can be used to produce high-quality equalized chest radiographs.
D005374:Filtration / Q000295:instrumentation / Q000379:methods; D006801:Humans; D013902:Radiography, Thoracic / Q000295:instrumentation* / Q000379:methods