PD40-03 UTILIZATION OF MEDMEASURE!, A SMARTPHONE-BASED APP, AS A RELIABLE METHOD FOR FLUOROSCOPIC AND ENDOSCOPIC MEASUREMENTS

Abstract

You have accessJournal of UrologySurgical Technology & Simulation: Instrumentation & Technology III1 Apr 2018PD40-03 UTILIZATION OF MEDMEASURE!, A SMARTPHONE-BASED APP, AS A RELIABLE METHOD FOR FLUOROSCOPIC AND ENDOSCOPIC MEASUREMENTS Samuel Washington, III and Maurice Garcia Samuel Washington, IIISamuel Washington, III More articles by this author and Maurice GarciaMaurice Garcia More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2018.02.1928AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Endoscopic procedures are ubiquitous amongst urology practices across the world. A reliable evaluation of the size of the stone or tumor evaluated during an endoscopic procedure can significantly alter management. To our knowledge a standardized, reliable method for measurement in endoscopic cases has yet to be developed. We describe utilization of a smartphone-based application, MedMeasure! for objective measurements during endoscopy. METHODS We conducted an ex-vivo experiment using an Olympus cystoscope with a 30 degree lens to simulate a standard endoscopic procedure. We then visualized a reference item of known diameter (quarter and nickel) and a target object (ruler) in the same field of view. We describe the reference and target objects in several configurations based upon their position to each other and relative distance to the cystoscope. Nomenclature used as follows: A-P, both objects are perpendicular to the cystoscope; Angled, objects parallel to one another and tilted away from scope; Askew, objects at different angles relative to scope; Equidistant, same distance from cystoscope; Offset, objects at unequal distances from scope; Foreground, one object closer to scope than the other. For each configuration a picture was taken of the image on the monitor using an iPhone camera. MedMeasure! was used to then measure the width of the target object. We calculated the difference between the measured and known diameter of the target object in each configuration. We then derived the percentage distortion between measured and known values by dividing the previously calculated differences by the known diameter. Box plot graphs was used to illustrate the inter-observer variation as well as the extent of distortion of the target image. RESULTS The reference objects used were items whose diameters are well-known and standardized, a quarter, 24.3mm, and a nickel, 21.21mm. The target object of interest was a ruler with a width of 4cm. Distortion was the least when both objects were equidistant, either A-P (12-14% distortion) or askew (6-30%) (p>0.05 for both). The distortion increased significantly when offset or at different distances from the scope (p<0.001 for all). CONCLUSIONS Using a smartphone-based app, MedMeasure!, we demonstrate that accurate measurements can be obtained during fluoroscopic and endoscopic procedures using a reference object with the target at the same distance from the cystoscope. Distortion increases significantly when objects are askew or at different distances from the cystoscope. © 2018FiguresReferencesRelatedDetails Volume 199Issue 4SApril 2018Page: e803-e804 Advertisement Copyright & Permissions© 2018MetricsAuthor Information Samuel Washington, III More articles by this author Maurice Garcia More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...