These test objects are designed for systems which operate by sensing mean signal levels. The TO DR tests dynamic range by measuring detail visibility over a wide range of input X-ray intensities. Different designs cater for subtraction and non-subtraction systems.

TO DR (4 Piece)
Supplied in a set that allows it to be used for both subtraction and non-subtraction systems.

TO DR (2 Piece)
For use with non-subtraction systems only.