Mikael Fontarensky MD, Presenter: Nothing to Disclose

Agaicha Alfidja, Abstract Co-Author: Nothing to Disclose

Renan PERIGNON MD, Abstract Co-Author: Nothing to Disclose

Arnaud Schoenig, Abstract Co-Author: Nothing to Disclose

Christophe Perrier, Abstract Co-Author: Nothing to Disclose

Aurelien Mulliez, Abstract Co-Author: Nothing to Disclose

Laurent Guy, Abstract Co-Author: Nothing to Disclose

Louis Bernard Boyer MD, Abstract Co-Author: Nothing to Disclose

To evaluate the accuracy of ultra-low dose abdominal CT in the diagnosis of acute renal colic with a new generation model-based iterative reconstruction MB-IR / VéoTM, comparing it to low dose abdominal CT using 50% Adaptative Statistical Iterative Reconstruction (ASIR 50%).

Prospective monocentric study including 118 patients with symptoms of acute renal colic who underwent 2 successive CT acquisitions: « Standard-ASIR50% » and « ultra-low dose VeoTM ».Two readers independently reviewed both CT examinations concerning the presence of renal colic, differential diagnoses and associated abnormalities. The results and doses as well as image quality of both two CT expositions were compared. 

Intra observer correlation was 100% for the diagnosis of renal colic (kappa к=1), τ=98.7% к=0.97, and τ=98.16% к=0.95 respectively for the detection of calculus and uretero hydronephrosis, and / τ=98.87% к=0.95 for differential or alternative diagnoses. Ultra-low dose CT using VeoTM allows a reduction of 84% of the dose delivered (DLP = 92.07±44.58 versus 586±270.01 mGy.cm p<0.001), without any significant alteration of image quality (mean score 3.83±0.49/4 for ultra-low dose VeoTM versus 3.92±0.27/4 for ASIR 50 %(p=0.32), nor increase in noise (18.36±2.53 versus 17.40±3.42UH).

Ultra-low dose CT using model-based iterative reconstruction MB-IR/VeoTM allows a dose reduction (84%) without any noise increase or alteration of image quality in the diagnosis of acute renal colic. We have also determined a threshold of 40mGy.cm in abdominal CT.

Detection of renal colic with ultra low-dose CT-scan using Model-based iterative reconstruction VEOTM is as accurate as standard CT-Scan with adaptative statistical iterative reconstruction (ASIR), and allows a dose reduction of 84%. 

Fontarensky, M, Alfidja, A, PERIGNON, R, Schoenig, A, Perrier, C, Mulliez, A, Guy, L, Boyer, L, Model-based Iterative Reconstruction (MB-IR VEOTM) with Ultra Low-dose Abdominal CT versus Adaptative Statistical Iterative Reconstruction (ASIR) in the Diagnosis of Acute Renal Colic.  Radiological Society of North America 2014 Scientific Assembly and Annual Meeting, - ,Chicago IL. http://archive.rsna.org/2014/14011005.html