Materials and MethodsSonography was performed using a Philips SDU 3000 real-time scanner with either a 3.5-or 5.0-MHz transducer.Of 100 consecutive patients undergoing ESWL, 94 were studied the day before treatment and at 24 and 48 hr after the treatment. Four additional patients had only post-ESWL sonography, and two other patients had only pre-ESWL sonography. The images were evaluated with the knowledge that each patient was being examined before or after ESWL, but without other radiographic studies for comparison.The diagnosis of a calculus was made when a highly echogenic focus was detected within the collecting system associated with distal acoustic shadowing.In a few cases, the calculus was identified as an Downloaded from www.ajronline.org by 54.245.55.244 on 05/12/18 from IP address 54.245.55.244.
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