#WCE2014 - Ellipsoid stone volume measured on computed tomography imaging correlates with computer generated 3D volumes - Interview

TAIPEI, TAIWAN (UroToday.com) - Introduction and Objectives: Numerous CT-based parameters describing stone size have been reported to predict shockwave lithotripsy (SWL) success. Amongst these, stone volume has greatest predictive value. Widespread use of this metric is limited by the specialized software and expertise required for its determination. The majority of stones considered for SWL are ellipsoid in shape. Therefore, we hypothesize that the manually measured ellipsoid stone volume (ESV) can closely approximate the computer-generated stone volume (CSV).

wceMethods: CT scans for 24 patients with urinary stones greater than 4mm were reviewed by a radiologist. CSV was generated utilizing the TeraRecon® 3D volume rendering software. To determine ESV, the anteroposterior (AP), horizontal (H) and craniocaudal (CC) stone dimensions were measured. ESV was calculated based upon the ellipsoid volume formula, volume = (π /6) x (AP x H x CC). Correlation was assessed utilizing the Pearson product-moment correlation coefficient.

Results: Twenty-eight stones were analyzed. 25/28 (89.2%) stones were ellipsoid in shape. For all stones analyzed, the correlation coefficient between CSV and ESV was 0.9778. When non-ellipsoid stones were excluded from the analysis, the correlation coefficient between CSV and ESV was 0.9893.

Conclusions: We describe a novel method for estimating stone volume that is accurate and easy to rapidly determine. Incorporation of the ellipsoid stone volume into preoperative planning can facilitate better preoperative patient selection for SWL.

Source of Funding: None

 
Listen to an interview with Timothy Tran, one of the authors of this study.

 

Presented by Timothy Tran, Darren Bialo, and Gyan Pareek at the 32nd World Congress of Endourology & SWL - September 3 - 7, 2014 - Taipei, Taiwan

Alpert Medical School of Brown University, Providence, RI USA

 

Conference Coverage
 
Recent data from conferences worldwide
  • 2020 Virtual Congress / September 19-21
  • 2020 BCAN Think Tank Virtual / August 7
  • 2020 Virtual Education Program / August 8-10
  • 2020 Annual Meeting / July 17-19 / EAU Virtual Program
  • SUO - AUA 2020 Summer Webcast / July 18
  • 2020 Annual Meeting / June 27-28 / AUA Live Virtual Program
  • 2020 Annual Meeting / May 29-31 / Virtual Scientific Program
  • 2020 Annual Meeting / February 13-15 / San Francisco, CA
  • 2019 Annual Meeting / December 4-6 / Washington, DC
  • 2019 Annual Meeting / October 3 - October 5 / Aarhus, Denmark
  • 2019 Annual Congress / September 27 - October 1 / Barcelona, Spain
  • 2019 Biennial Meeting / August 29-31 / Basel, Switzerland