Reduction of the radiation dose and the amount of contrast material in hepatic dynamic CT using low tube voltage and adaptive iterative dose reduction 3-dimensional

Medicine
Atsushi NakamotoYoshifumi Narumi

Abstract

The purpose of this study was to prospectively evaluate the image quality and the diagnostic ability of low tube voltage and reduced contrast material dose hepatic dynamic computed tomography (CT) reconstructed with adaptive iterative dose reduction 3-dimensional (AIDR 3D).Eighty-nine patients underwent hepatic dynamic CT using one of the 2 protocols: tube voltage of 120 kVp, contrast dose of 600 mgI/kg, and filtered back projection in Protocol A (n = 46), and tube voltage of 100 kVp, contrast dose of 500 mgI/kg, and AIDR 3D in Protocol B (n = 43). The volume CT dose index (CTDIvol) and size-specific dose estimates (SSDEs) were compared between the 2 groups. Objective image noise and tumor to liver contrast-to-noise ratio (CNR) were also compared. Three radiologists independently reviewed image quality. The jackknife alternative free-response receiver-operating characteristic (JAFROC) analysis was performed to compare diagnostic performance.The mean CTDIvol and SSDE of Protocol B (14.3 and 20.2, respectively) were significantly lower than those of Protocol A (22.1 and 31.4, P < .001). There were no significant differences in either objective image noise or CNR. In the qualitative analysis, 2 readers assigned significant lower s...Continue Reading

References

Sep 21, 2004·Medical Physics·Dev P Chakraborty, Kevin S Berbaum
Nov 30, 2007·The New England Journal of Medicine·David J Brenner, Eric J Hall
Mar 23, 2012·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Saebeom HurByung Ihn Choi
Oct 24, 2012·Radiology·Jodie A ChristnerCynthia H McCollough
Jan 17, 2013·Journal of Computer Assisted Tomography·Hiroshi JuriYoshifumi Narumi
Jul 1, 2015·Journal of Computer Assisted Tomography·Hiromitsu OnishiNoriyuki Tomiyama

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Methods Mentioned

BETA
X-ray

Software Mentioned

JAFROC
AIDR
AIDR 3D Weak
Ziostation

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