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• W2073288317 abstract "You have accessJournal of UrologyStone Disease: Evaluation I1 Apr 2015MP75-17 IN VIVO RADIATION EXPOSURE DUE TO URINARY CALCULI IMAGING: SINGLE ENERGY CT VS. LOW DOSE CT VS. DUAL SOURCE DUAL ENERGY CT (DECT) Maria Jepperson, Joseph Cernigliaro, Ibrahim El-Sayed, William Haley, David Thiel, and Abby Taylor Maria JeppersonMaria Jepperson More articles by this author , Joseph CernigliaroJoseph Cernigliaro More articles by this author , Ibrahim El-SayedIbrahim El-Sayed More articles by this author , William HaleyWilliam Haley More articles by this author , David ThielDavid Thiel More articles by this author , and Abby TaylorAbby Taylor More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2015.02.2714AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Radiation exposure is often required to diagnose, treat and manage urolithiasis; it is important to have an understanding of available CT imaging techniques and their concomitant radiation exposure. METHODS Of 200 consecutive DECT examinations performed at our institution between May and December of 2012, 35 patients had undergone a single energy low dose renal stone protocol (ldSECT; 120 kVp/160 mAs and CTDIvol=10.78 mGy) and 30 patients had undergone a standard single energy CT (SECT; 120 kVp/240 mAs and CTDIvol=16.18 mGy) within two years of the DECT exam. DECT was performed using a Definition Flash Scanner (Siemens, Forchheim, Germany) in dual energy mode. DECT protocol: patient's cross sectional diameter <35cm: 80 kVp/419 mAs, 140kVp/162 mAs and CTDIvol=15.51 mGy; patient's cross sectional diameter >35cm: 100 kVp/210 mAs, 140kVp/162 mAs and CTDIvol=16.61 mGy. Automated exposure control (CareDose4D; Siemens Healthcare) was used for all imaging protocols. CTDIvol, DLP, and effective dose were compared using a Student's t-test. Stone material was available for 15 patients and was used to assess accuracy of DECT determination of stone composition. RESULTS DECT had an average radiation exposure reduction of 40% when compared to SECT performed on the same patient (p<0.001). When divided into subgroups of low kV (80/140) and high kV (100/140) there was an average of a 46% and 35% reduction in radiation exposure, respectively (p=<0.001). DECT performed at the lower setting of 80/140 kVp showed a 10% average reduction (p= 0.01) in radiation exposure compared with ldSECT. DECT performed at the higher setting of 100/140 kVp showed no difference in radiation exposure compared to ldSECT (p>0.05). Since a single cohort was used, patient parameters such as gender and body composition were internally controlled. DECT analysis correctly predicted stone composition in 15/16 patients (93%). CONCLUSIONS DECT provides additional information of stone composition without increasing patient radiation exposure compared with ldSECT and has an average of 40% less radiation exposure when compared with conventional SECT of the abdomen and pelvis. © 2015 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 193Issue 4SApril 2015Page: e953-e954 Advertisement Copyright & Permissions© 2015 by American Urological Association Education and Research, Inc.MetricsAuthor Information Maria Jepperson More articles by this author Joseph Cernigliaro More articles by this author Ibrahim El-Sayed More articles by this author William Haley More articles by this author David Thiel More articles by this author Abby Taylor More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ..." @default.
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• W2073288317 title "MP75-17 IN VIVO RADIATION EXPOSURE DUE TO URINARY CALCULI IMAGING: SINGLE ENERGY CT VS. LOW DOSE CT VS. DUAL SOURCE DUAL ENERGY CT (DECT)" @default.
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