Fig. 2

Evaluation of respiration. a, b The position of the bed was set to fit the shockwave using X-rays, the operator explained to the patient the reason for measuring respiration during lithotripsy, then lithotripsy began. c, d Patients’ respiration curves of inhalation and exhalation were recorded, and the locations of the stones in the kidney were predicted using ultrasound to recognize a specific breath point and generate high-accuracy shockwave targeting