title: [New ultrasound navigational system in extracorporeal lithotripsy: decreased fluoroscopy and radiation].
abstract: OBJECTIVE
  Extracorporeal shock wave lithotripsy is the most common method of treatment for kidney stones. Both fluoroscopy and ultrasound imaging can be used to locate stones, but fluoroscopy is more frequently employed. Evaluation of a new stereotaxic navigational system: the stone was located using an ultrasound probe, and its 3D location was saved. The table automatically moved to position the stone at the focal point. A real-time follow-up was possible during treatment. Our objective was to demonstrate a decrease in the use of fluoroscopy to locate kidney stones for extracorporeal shock wave lithotripsy through the use of a 3D ultrasound stone locking system.
  
  
  METHODS
  Prospective analysis of the case records of the 20 patients preceding and the 20 patients succeeding the arrival of the ultrasound stone locking system Visio-Track (EDAP-TMS). We used a Student test to compare age, BMI, kidney stone size, number of shock waves and administered energy.
  
  
  RESULTS
  Patient characteristics were comparable. The average age was 55 years old and the average kidney stone size was 10.7 mm. Radiation duration was 174.8 seconds in the group without Visio-Track versus 57.1 seconds in the group with it (P<0.0001). A similar result was observed for radiation doses: 5197.25 mGy x cm2 for the group without versus 1987.6 mGy x cm2 for the group with Visio-Track (P=0.0033).
  
  
  CONCLUSIONS
  The stone locking system Visio-Track reduced fluoroscopy in our first group of patients, which decreased the patient's individual absorbed irradiation dose.
authors.affiliation: Service d'urologie et chirurgie de la transplantation, hôpital Édouard-Herriot, 5, place d'Arsonval, 69003 Lyon, France. Electronic address: nadia.abid@chu-lyon.fr.
authors.forename: N
authors.initials: N
authors.lastname: Abid
authors.forename: E
authors.initials: E
authors.lastname: Ravier
authors.forename: R
authors.initials: R
authors.lastname: Codas
authors.forename: S
authors.initials: S
authors.lastname: Crouzet
authors.forename: X
authors.initials: X
authors.lastname: Martin
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005471:Fluoroscopy; D006801:Humans; D007669:Kidney Calculi / Q000000981:diagnostic imaging* / Q000628:therapy*; D008096:Lithotripsy / Q000379:methods*; D008875:Middle Aged; D011446:Prospective Studies; D011829:Radiation Dosage; D013238:Stereotaxic Techniques; D013997:Time Factors; D018084:Ultrasonography, Interventional / Q000295:instrumentation* / Q000379:methods
keywords: Extracorporeal shock wave lithotripsy; Irradiation; Lithotritie extracorporelle; Radiation dose; Repérage échographique; Ultrasound stone localization