2296 ORGAN SPECIFIC RADIATION DOSE AND EFFECTIVE DOSE FOR RENAL STONE PROTOCOL COMPUTERIZED TOMOGRAPHY (CT)

Abstract

You have accessJournal of UrologyStone Disease: Basic Research II1 Apr 20122296 ORGAN SPECIFIC RADIATION DOSE AND EFFECTIVE DOSE FOR RENAL STONE PROTOCOL COMPUTERIZED TOMOGRAPHY (CT) Muhammad W. Iqbal, Agnes J. Wang, Giao Nguyen, Gastón M. Astroza, Greta Toncheva, Natalie Januzis, Carolyn Lowry, Amy M. Neville, Michael N. Ferrandino, Terry T. Yoshizumi, Glenn M. Preminger, and Michael E. Lipkin Muhammad W. IqbalMuhammad W. Iqbal Durham, NC More articles by this author , Agnes J. WangAgnes J. Wang Durham, NC More articles by this author , Giao NguyenGiao Nguyen Durham, NC More articles by this author , Gastón M. AstrozaGastón M. Astroza Durham, NC More articles by this author , Greta TonchevaGreta Toncheva Durham, NC More articles by this author , Natalie JanuzisNatalie Januzis Durham, NC More articles by this author , Carolyn LowryCarolyn Lowry Durham, NC More articles by this author , Amy M. NevilleAmy M. Neville Durham, NC More articles by this author , Michael N. FerrandinoMichael N. Ferrandino Durham, NC More articles by this author , Terry T. YoshizumiTerry T. Yoshizumi Durham, NC More articles by this author , Glenn M. PremingerGlenn M. Preminger Durham, NC More articles by this author , and Michael E. LipkinMichael E. Lipkin Durham, NC More articles by this author View All Author Informationhttps://doi.org/10.1016/j.juro.2012.02.2476AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookTwitterLinked InEmail INTRODUCTION AND OBJECTIVES Patients with nephrolithiasis are at increased risk for radiation exposure. The amount of radiation these patients are exposed to from a CT scan is evolving, as protocols evolve. The concern over increased patient radiation exposure is related to the risk of developing a malignancy. Effective dose (ED) is a value that relates the amount of radiation absorbed to the risk of developing a malignancy. This study was done to measure organ specific radiation doses and determine the effective dose for a non-contrast CT abdomen/pelvis for the evaluation of nephrolithiasis performed at our institution. METHODS An anthropomorphic, adult male phantom validated for human organ dosimetry, was placed on a GE 64-slice Volume CT scanner in prone position. A non-contrast CT abdomen/pelvis was performed with the following settings: tube voltage 120 kV, tube current 700 mA, pitch 1.375:1, noise index 17.5. High sensitivity metal oxide semiconductor field effect transistors (MOSFET) dosimeters were placed at 20 organ locations and used to measure organ radiation doses. The organ doses were multiplied by their tissue weighting factors(Wt) and summed to determine the effective dose. Tissue weighting factors are obtained from the International Commission on Radiological Protection, publication (ICRP) 103. RESULTS The bone marrow was exposed to the highest absorbed dose, with cumulative dose of 13.4 milligray (mGy), followed by the skin entrance, 7.23 mGy and bladder 6.60 mGy. The ED for the renal stone CT was 3.04 milli Sieverts(mSv). CONCLUSIONS Radiation from CT scans contributes to the overall radiation exposure for patients with nephrolithiasis. A non-contrast CT performed for the evaluation of nephrolithiasis results in an effective dose of 3.04 mSv. Accurate determination of ED enables patients and clinicians to make informed decisions regarding CT imaging and allows calculation of cumulative ED in this high risk population. © 2012 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 187Issue 4SApril 2012Page: e926-e927 Advertisement Copyright & Permissions© 2012 by American Urological Association Education and Research, Inc.MetricsAuthor Information Muhammad W. Iqbal Durham, NC More articles by this author Agnes J. Wang Durham, NC More articles by this author Giao Nguyen Durham, NC More articles by this author Gastón M. Astroza Durham, NC More articles by this author Greta Toncheva Durham, NC More articles by this author Natalie Januzis Durham, NC More articles by this author Carolyn Lowry Durham, NC More articles by this author Amy M. Neville Durham, NC More articles by this author Michael N. Ferrandino Durham, NC More articles by this author Terry T. Yoshizumi Durham, NC More articles by this author Glenn M. Preminger Durham, NC More articles by this author Michael E. Lipkin Durham, NC More articles by this author Expand All Advertisement Advertisement PDF downloadLoading ...