Is stone radiodensity a useful parameter for predicting outcome of extracorporeal shockwave lithotripsy for stones < 2 cm?

Abstract

On the Doli machine, stone radiodensity alone does not predict lithotripsy treatment outcome for stones < or = 1 cm within the renal pelvis. This parameter is probably only useful as the stone size becomes larger than 1 cm, and should be used in conjunction with other stone parameters to select appropriate therapy.