2186 PITFALLS IN URINARY STONE IDENTIFICATION USING CT ATTENUATION VALUES: ARE WE GETTING THE SAME INFORMATION ON DIFFERENT SCANNER MODELS?

Abstract

You have accessJournal of UrologyImaging/Radiology: Uroradiology II1 Apr 20122186 PITFALLS IN URINARY STONE IDENTIFICATION USING CT ATTENUATION VALUES: ARE WE GETTING THE SAME INFORMATION ON DIFFERENT SCANNER MODELS? Romain Grosjean, Michel Daudon, Mario Chammas, Alain Blum, Jacques Felblinger, M. Claudon, D. Regent, and Jacques Hubert Romain GrosjeanRomain Grosjean Nancy, France More articles by this author , Michel DaudonMichel Daudon Nancy, France More articles by this author , Mario ChammasMario Chammas Nancy, France More articles by this author , Alain BlumAlain Blum Nancy, France More articles by this author , Jacques FelblingerJacques Felblinger Nancy, France More articles by this author , M. ClaudonM. Claudon Nancy, France More articles by this author , D. RegentD. Regent Nancy, France More articles by this author , and Jacques HubertJacques Hubert Nancy, France More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2012.02.2360AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Our objective is to analyze the imaging findings of 241 renal stones in studies performed using four different Computed Tomography scanners aiming to determine the stone composition based on CT attenuation values and to evaluate potential differences between each model. METHODS 241 human urinary stones were obtained from the data base of a stone-analysis laboratory. They have been collected during surgical and endoscopic interventions. Their biochemical composition was determined and the stones were classified according to their main component. Four differents CT scanners (Somatom Sensation 16 (Siemens, Erlangen, Germany), Brilliance VCT (Philips Healthcare, Eindhoven, The Netherlands) , Lightspeed VCT (GEMS, Milwaukee, USA) and Aquilion one (Toshiba Medical, Zoetermeer, The Netherlands)) were evaluated. During the imaging studies the regions of interest (ROI) were placed within the largest area of the stones. The mean CT-attenuation values and the standard deviation were recorded in Hounsfield Units (HU). The results of each scanner were recorded separately (4 groups) and compared with a t-paired test. RESULTS For all tested CT scanners, when the classification of the various types of stones was arranged according to the mean CT-attenuation values and to the confidence interval, large overlappings between stone types were highlighted. The t-paired test used to compare the mean CT-attenuation values between the different types of stones showed that most stone types could not be identified. Some types of stones presented mean CT attenuation values significantly different from one CT scanner to another. At 80kV, the mean CT attenuation values obtained with the Toshiba Aquilion one were all significantly different from those obtained with the Siemens Sensation 16. On the other hand, the mean values obtained with the Philips Brilliance VCT were all significantly equal to those obtained with the Siemens Sensation 16 and with the Toshiba Aquilion one. At 120 kV the mean CT attenuation values of uric acid, cystine and struvite stones obtained with the Philips Brilliance VCT are significantly different from those obtained with the Siemens Sensation 16 and the Toshiba Aquilion but equal to those obtained with the GE 64. CONCLUSIONS According to our study, there is a great variability of results when different brands and models of scanners are compared directly. Furthermore, the CT scan analysis and HU evaluation appears gather insufficient information in order to characterize and identify the composition of renal stones. © 2012 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 187Issue 4SApril 2012Page: e881-e882 Advertisement Copyright & Permissions© 2012 by American Urological Association Education and Research, Inc.MetricsAuthor Information Romain Grosjean Nancy, France More articles by this author Michel Daudon Nancy, France More articles by this author Mario Chammas Nancy, France More articles by this author Alain Blum Nancy, France More articles by this author Jacques Felblinger Nancy, France More articles by this author M. Claudon Nancy, France More articles by this author D. Regent Nancy, France More articles by this author Jacques Hubert Nancy, France More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...