Turkish Journal of Urology (Turk J Urol) is the scientific, peer reviewed, open access publication of the Turkish Association of Urology. The journal is a bimonthly publication, published on January, March, May, July, September and November and its publication language is English. The aim of the Turkish Journal of Urology is to contribute to the literature by publishing scientifically high-quality research articles as well as reviews, editorials, letters to the editor and case reports.
INTRODUCTION AND OBJECTIVES: Limiting the amount of ionizing radiation exposure for both patients and staff is an important principle in the management of patients with kidney stones. While ultrasound guided access during percutaneous nephrolithotomy (PCNL) has been shown to help reduce the amount of radiation associated with this operation, the radiation exposure associated with the remaining e724
Complete URS procedures were recorded and 30 stone fragments were extracted and measured using digital calipers. The novel software program was applied to the recorded URS footage in order to obtain ureteroscopederived stone size measurements. These ureteroscope-derived measurements were then compared to the actual measured fragment size.RESULTS: The median longitudinal and transversal error was 0.14 mm (95%CI 0.1-0.18) and 0.09 mm (95%CI 0.02-0.15), respectively. The overall software accuracy and precision were 0.17 mm and 0.15 mm, respectively. The longitudinal and transversal measurements obtained by the software and digital calipers were highly correlated (r ¼ 0.97 and 0.93). Neither stone size nor stone type was correlated with error measurements.CONCLUSIONS: This novel method and software reliably measured stone fragment size during URS. The software ultimately has the potential to make ureteroscopy safer and more efficient. Figure 1. Method of stone measurement. (a, c) Stone fragment as measured by digital calipers. (b, d) The same stone as measured by software. The fragment is grasped within the basket and the basket tip serves as the reference point for stone measurement. A scale can be seen around the periphery of the image, with a 1 mm measurement marked in yellow. Stone can also be measured by selecting the limits of the stone (seen in green, with corresponding stone measurement of 4.11 and 1.82 mm).
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