digital x-ray radiogrammetry digital x-ray radiogrammetry digital x-ray radiogrammetry is a method for measuring bone mineral density (bmd). digital x-ray radiogrammetry is based on the old technique of radiogrammetry. in dxr, the cortical thickness of the three middle metacarpal bones of the hand is measured in a digital x-ray image. through a geometrical operation the thickness is converted to bone mineral density. the bmd is corrected for porosity of the bone, estimated by a texture analysis performed on the cortical part of the bone. digital x-ray radiogrammetrysynonymsdxr like other technologies for estimating the bone mineral density, the outputs are an areal bmd value, a t-score and a z-score for assessing osteoporosis and the risk of bone fracture. digital x-ray radiogrammetry is primarily used in combination with digital mammography for osteoporosis screening, where same mammography machine that is used to acquire breast x-ray images is also used to acquire a hand image for bmd measurement. due to high precision, dxr is also used for monitoring change in bone mineral density over time.