PRedictive Accuracy of Initial Stone Burden Evaluation.

Measurement of the stone burden by cumulative stone diameter, the sum of linear longest diameters of all the stones to be treated within one patient as measured on the CT or by additional rendering software

Measurement of the stone burden by surface area, the sum of surface areas of all the stones to be treated within one patient as measured on the CT or by additional rendering software

Measurement of the stone burden by volume of all the stones to be treated within one patient, as measured on the CT or by additional rendering software