1812 IMPROVED STONE PHANTOMS FOR SHOCK WAVE LITHOTRIPSY (2010)

You have accessJournal of UrologyStone Disease: SWL, Ureteroscopic or Percutaneous Stone Removal III1 Apr 20101812 IMPROVED STONE PHANTOMS FOR SHOCK WAVE LITHOTRIPSY Michael Lipkin, Dorit Zilberman, Neal Simmons, Eric Esch, Glenn Preminger, and Pei Zhong Michael LipkinMichael Lipkin More articles by this author , Dorit ZilbermanDorit Zilberman More articles by this author , Neal SimmonsNeal Simmons More articles by this author , Eric EschEric Esch More articles by this author , Glenn PremingerGlenn Preminger More articles by this author , and Pei ZhongPei Zhong More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2010.02.1737AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES BegoStone plaster has been used as a stone phantom material for shock-wave lithotripsy (SWL) research because of its physical similarity to calcium oxalate monohydrate. However, human stones vary in composition and physical properties. The purpose of this study was to develop a BegoStone phantom that would closely mimic the properties of other types of human stones. The ratio of BegoStone powder to water was varied and the tensile strength, longitudinal wave speed, and transverse wave speeds were measured for the resulting samples. METHODS BegoStone powder was mixed water in varying ratios (15:3, 15:4, 15:5, 15:6). The samples molded into 5mm x 10mm cylindrical stones and subsequently sectioned for either acoustic or tensile testing. Tensile strength was determined using a diametral compression fixture on a universal testing machine. Longitudinal and wave speeds were determined by measuring the propagation time of an ultrasound pulse in a sample of known thickness. RESULTS The phantom tensile strength decreased as the powder:water ratio decreased (15:3–7MPa, 15:4–5MPa, 15:5–3.8 MPa, 15:6–3.2MPa). Longitudinal wave speeds decreased with increased water (15:3-8.2•106Kg/m2s, 15:4-6.4•106Kg/m2s, 15:5-5.2•106Kg/m2s, 15:6-4.9•106Kg/m2s) with transverse wave speed following a similar trend (15:3-4.6•106Kg/m2s, 15:4-3.5•106Kg/m2s, 15:5-3.1•106Kg/m2s, 15:6-2.8•106Kg/m2s). CONCLUSIONS The range of physical properties produced with powder to water ratios of 15:3 to 15:6 matches those of human kidney stones. A stone phantom possessing the physical and acoustic properties similar human kidneys stones can be produced with different BegoStone powder to water ratios: 15:3 phantoms have properties similar to COM and brushite, 15:5 ratio possess properties similar to uric acid, while 15:6 has similar properties to struvite stones. Durham, NC© 2010 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 183Issue 4SApril 2010Page: e703 Advertisement Copyright & Permissions© 2010 by American Urological Association Education and Research, Inc.MetricsAuthor Information Michael Lipkin More articles by this author Dorit Zilberman More articles by this author Neal Simmons More articles by this author Eric Esch More articles by this author Glenn Preminger More articles by this author Pei Zhong More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...