PD23-07 PELVIC DIGITAL TOMOSYNTHESIS FOR THE EVALUATION OF DISTAL URETERAL CALCULI: ORGAN SPECIFIC DOSES AND EFFECTIVE DOSE COMPARED WITH NON-CONTRAST COMPUTED TOMOGRAPHY

INTRODUCTION AND OBJECTIVES:Follow-up imaging to confirm passage of distal ureteral stones represents a dilemma in the outpatient setting. We have previously published on the substantial radiation reduction, cost savings and clinical usefulness of abdominal digital tomosynthesis in the evaluation of renal and proximal ureteral stones relative to stone protocol non-contrast computed tomography (NCCT). The aim of this study is to report on our early clinical experience using pelvic digital tomosynthesis for the evaluation of distal ureteral stones as well as to describe the effective dose (ED) and organ specific doses (ODs) for this technique compared to NCCT.METHODS:A validated anthropomorphic phantom was placed supine on a digital GE Definium 8000 radiological scanner. A 0.18cc ion chamber was placed on the phantom surface in the center of the imaged field to measure skin entrance exposure during 6 pelvic DTs. Using these data, PCXMC 2.0 software was used to calculate ODs by Monte Carlo simulation and ED ...