Evaluation of an iterative model-based reconstruction algorithm for low-tube-voltage (80 kVp) computed tomography angiography

被引:21
作者
Noel, Peter B. [1 ]
Koehler, Thomas [2 ]
Fingerle, Alexander A. [1 ]
Brown, Kevin M. [3 ]
Zabic, Stanislav [3 ]
Muenzel, Daniela [1 ]
Haller, Bernhard [4 ]
Baum, Thomas [1 ]
Henninger, Martin [1 ]
Meier, Reinhard [1 ]
Rummeny, Ernst J. [1 ]
Dobritz, Martin [1 ]
机构
[1] Tech Univ Munich, Dept Radiol, D-81675 Munich, Germany
[2] Philips Res Labs, D-22335 Hamburg, Germany
[3] Philips Healthcare, Cleveland, OH 44143 USA
[4] Tech Univ Munich, Inst Med Stat & Epidemiol, D-81675 Munich, Germany
关键词
computed tomography; iterative reconstruction; low-tube-current; computed tomography angiography; dose reduction; low-tube-voltage;
D O I
10.1117/1.JMI.1.3.033501
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
The objective of this study was to investigate the improvement in diagnostic quality of an iterative model-based reconstruction (IMBR) algorithm for low-tube-voltage (80-kVp) and low-tube-current in abdominal computed tomography angiography (CTA). A total of 11 patients were imaged on a 256-slice multidetector computed tomography for visualization of the aorta. For all patients, three different reconstructions from the low-tube-voltage data are generated: filtered backprojection (FBP), IMBR, and a mixture of both IMBR + FBP. To determine the diagnostic value of IMBR-based reconstructions, the image quality was assessed. With IMBRbased reconstructions, image noise could be significantly reduced, which was confirmed by a highly improved contrast-to-noise ratio. In the image quality assessment, radiologists were able to reliably detect more third-order and higher aortic branches in the IMBR reconstructions compared to FBP reconstructions. The effective dose level was, on average, 3.0 mSv for 80-kVp acquisitions. Low-tube-voltage CTAs significantly improve vascular contrast as presented by others; however, this effect in combination with IMBR enabled yet another substantial improvement of diagnostic quality. For IMBR, a significant improvement of image quality and a decreased radiation dose at low-tube-voltage can be reported. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.
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页数:7
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