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. The TO.DR (4 piece) Supplied in a set that allows it to be used for both subtraction and non-subtraction systems. Comprises of the following test objects: ? Filter Plate ? Non-Subtraction Detail Plate ? Subtraction Detail Plate ? Blank Plate The TO.DR (2 piece) For use with non-subtraction systems only. Comprises of the following test objects: ? Filter Plate ? Non-Subtraction Detail Plate
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