PURPOSE: A prototype ultrasound-based probe for use in ureteroscopy was used for in vitro measurements of stone fragments in a porcine kidney. METHODS: Fifteen human stones consisting of three different compositions were placed deep in the collecting system of a porcine kidney. A 2 MHz, 1.2 mm (3.6F) needle hydrophone was used to send and receive ultrasound pulses for stone sizing. Calculated stone thicknesses were compared with caliper measurements. RESULTS: Correlation between ultrasound-determined thickness and caliper measurements was excellent in all three stone types (r(2) = 0.90, p < 0.0001). All 15 ultrasound measurements were accurate to within 1 mm, and 10 measurements were accurate within 0.5 mm. CONCLUSION: A 3.6F ultrasound probe can be used to accurately size stone fragments to within 1 mm in a porcine kidney.
PURPOSE: A prototype ultrasound-based probe for use in ureteroscopy was used for in vitro measurements of stone fragments in a porcine kidney. METHODS: Fifteen human stones consisting of three different compositions were placed deep in the collecting system of a porcine kidney. A 2 MHz, 1.2 mm (3.6F) needle hydrophone was used to send and receive ultrasound pulses for stone sizing. Calculated stone thicknesses were compared with caliper measurements. RESULTS: Correlation between ultrasound-determined thickness and caliper measurements was excellent in all three stone types (r(2) = 0.90, p < 0.0001). All 15 ultrasound measurements were accurate to within 1 mm, and 10 measurements were accurate within 0.5 mm. CONCLUSION: A 3.6F ultrasound probe can be used to accurately size stone fragments to within 1 mm in a porcine kidney.
Authors: Mathew D Sorensen; Jonathan D Harper; Ryan S Hsi; Anup R Shah; Manjiri K Dighe; Stephen J Carter; Mariam Moshiri; Marla Paun; Wei Lu; Michael R Bailey Journal: J Endourol Date: 2013-01-30 Impact factor: 2.942