Non-contrast CT at comparable dose to an abdominal radiograph in patients with acute renal colic; impact of iterative reconstruction on image quality and diagnostic performanceReport as inadecuate




Non-contrast CT at comparable dose to an abdominal radiograph in patients with acute renal colic; impact of iterative reconstruction on image quality and diagnostic performance - Download this document for free, or read online. Document in PDF available to download.

Insights into Imaging

, Volume 5, Issue 2, pp 217–230

First Online: 07 February 2014Received: 16 September 2013Revised: 20 November 2013Accepted: 13 January 2014

Abstract

ObjectivesThe aim was to assess the performance of low-dose non-contrast CT of the urinary tract LD-CT acquired at radiation exposures close to that of abdominal radiography using adaptive statistical iterative reconstruction ASiR.

MethodsThirty-three patients with clinically suspected renal colic were prospectively included.
Conventional dose CD-CT and LD-CT data sets were contemporaneously acquired.
LD-CT images were reconstructed with 40 %, 70 % and 90 % ASiR.
Image quality was subjectively and objectively measured.
Images were also clinically interpreted.

ResultsMean ED was 0.48 ± 0.07 mSv for LD-CT compared with 4.43 ± 3.14 mSv for CD-CT.
Increasing the percentage ASiR resulted in a step-wise reduction in mean objective noise p < 0.001 for all comparisons.
Seventy % ASiR LD-CT images had higher diagnostic acceptability and spatial resolution than 90 % ASiR LD-CT images p < 0.001.
Twenty-seven calculi diameter = 5.5 ± 1.7 mm, including all ureteric stones, were correctly identified using 70 % ASiR LD-CT with two false positives and 16 false negatives diameter = 2.3 ± 0.7 mm equating to a sensitivity and specificity of 72 % and 94 %.
Seventy % ASiR LD-CT had a sensitivity and specificity of 87 % and 100 % for detection of calculi >3 mm.

ConclusionReconstruction of LD-CT images with 70 % ASiR resulted in superior image quality than FBP, 40 % ASIR and 90 % ASIR.
LD-CT with ASIR demonstrates high sensitivity and specificity for detection of calculi >3 mm.

Teaching Points• Low-dose CT studies for urinary calculus detection were performed with a mean dose of 0.48 ± 0.07 mSv

• Low-dose CT with 70 % ASiR detected calculi >3 mm with a sensitivity and specificity of 87 % and 100 %

• Reconstruction with 70 % ASiR was superior to filtered back projection, 40 % ASiR and 90 % ASiR images

KeywordsIterative reconstruction Computed tomography Renal colic Nephrolithiasis Ureterolithiasis Radiation dose  Download fulltext PDF



Author: P. D. McLaughlin - K. P. Murphy - S. A. Hayes - K. Carey - J. Sammon - L. Crush - F. O’Neill - B. Normoyle - A. M. 

Source: https://link.springer.com/



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