Pro-RF Geometry
This device readily indicates a 1% or 2% misalignment at a 1 m focal-film distance (FFD), but it may be used at any FFD. It consists of a flat 20 x 25 cm plate with a 14 x 18 cm pattern etched on its surface. It can also be used to check fluoroscopy alignment and collimation.
Pro-RF Geometry
This device readily indicates a 1% or 2% misalignment at a 1 m focal-film distance (FFD), but it may be used at any FFD. It consists of a flat 20 x 25 cm plate with a 14 x 18 cm pattern etched on its surface. It can also be used to check fluoroscopy alignment and collimation.