AUA 2016: Automated Stone Volume Measurement Using Reduced-Dose (RD) CT Is Comparable Standard-Dose (SD) CT - Session Highlights

San Diego, CA USA ( The automated approach to stone volume measurement using CT has been shown in past studies to be more precise when compared to linear measurements. Dr. Bell and colleagues developed an ultra-low dose CT protocol where effective doses were reduced to an average of 0.9 millisievert, a reduction 70-90% compared to the average standard dose.

To evaluate this new CT protocol Dr. Bell and colleagues compared automated stone volume measurements on ultra-low dose CT to automated stone volume measurement on standard dose CT.

For this study, the authors performed a prospective trial of 20 patients with urolithiasis. All patients underwent concurrent ultra- low dose and standard dose CT imaging. The same dedicated software was used to assess automated stone volume for both images using the FBP algorithm for standard dose images and using FBP, PICCS, ASIR and Veo algorithms for ultra-low dose image reconstruction. Ultra low dose stone volume percent error compared to standard dose stone volume was analyzed.

Their results showed the volume percent volume error: ASiR 12.1%, FBP 16.9%, VEO 28.8%, PICCS 29.9%. The authors concluded from their findings that automated stone volume can be reliably obtained from ULD CT images with improved stone size assessment with very low dose radiation exposure to patients.


Presented By: John Roger Bell, MD


Written By: by Renai Yoon; Research Associate, Department of Urology, University of California, Irvine at the 2016 AUA Annual Meeting - May 6 - 10, 2016 – San Diego, California, USA