Short-Target-Film Rotating-Grid Magnification

Two techniques of direct-magnification radiography are compared : (a) standard magnification using a 40 cm air gap to reduce scatter, and (b) short-target-film (STF) magnification using a 55 cm target-film distance and a rotating grid to reduce scatter. Both techniques provide nearly equal resolution, although STF magnification is slightly superior in this respect. The advantages and disadvantages of STF magnification are discussed.