Use of the Acoustic Shadow Width to Determine Kidney Stone Size with Ultrasound

Barbrina Dunmire, Jonathan D. Harper, Bryan W. Cunitz, Franklin C. Lee, Ryan Hsi, Ziyue Liu, Michael R. Bailey, Mathew D. Sorensen

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Purpose Ultrasound is known to overestimate kidney stone size. We explored measuring the acoustic shadow behind kidney stones combined with different ultrasound imaging modalities to improve stone sizing accuracy. Materials and Methods A total of 45 calcium oxalate monohydrate stones were imaged in vitro at 3 different depths with the 3 different ultrasound imaging modalities of conventional ray line, spatial compound and harmonic imaging. The width of the stone and the width of the acoustic shadow were measured by 4 operators blinded to the true size of the stone. Results Average error between the measured and true stone width was 1.4 ± 0.8 mm, 1.7 ± 0.9 mm, 0.9 ± 0.8 mm for ray line, spatial compound and harmonic imaging, respectively. Average error between the shadow width and true stone width was 0.2 ± 0.7 mm, 0.4 ± 0.7 mm and 0.0 ± 0.8 mm for ray line, spatial compound and harmonic imaging, respectively. Sizing error based on the stone width worsened with greater depth (p

Original languageEnglish (US)
Pages (from-to)171-176
Number of pages6
JournalJournal of Urology
Volume195
Issue number1
DOIs
StatePublished - Jan 1 2016

Keywords

  • calculi
  • lithotripsy
  • nephrolithiasis
  • ultrasonography

ASJC Scopus subject areas

  • Urology

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