| Deng Chunlan,Xu Shunliang,Xiao Shengxiang,et al.The use of iterative reconstruction technique in low-dose CT angiography of renal artery[J].Chinese Journal of Radiological Medicine and Protection,2014,34(3):228-230 |
| The use of iterative reconstruction technique in low-dose CT angiography of renal artery |
| Received:December 09, 2013 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.03.018 |
| KeyWords:Renal artery Low-dose Iterative reconstruction Tomography,X-ray computer |
| FundProject: |
| Author Name | Affiliation | E-mail | | Deng Chunlan | Department of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | | Xu Shunliang | Department of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | | Xiao Shengxiang | Department of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | cn@139.com | | Yang Hong | Department of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | | | Feng Zhan | Department of Radiology, First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China | |
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| Abstract:: |
| Objective To assess the feasibility of computed tomography angiography (CTA) in renal artery using the iterative reconstruction technique(iDose4) in Brilliance iCT (Philips Ltd.). Methods 90 patients (body weight 60-70 kg) supposed to undergo renal artery CTA were selected and randomly divided into three groups: A(120 kV, 120 mAs), B(120 kV, 60 mAs) and C(100 kV, 100 mAs). CTA images from Group A were obtained using filtered back projection and those from the rest groups were generated by iDose4. Then CT number of renal artery, noise (denoted as standard deviation SD), signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of images for each group were measured and recorded. Images were post-processed using volume reformation (VR) 3D imaging and image quality were assessed in five-level grade (1-5). Results The five parameters (CT number of renal artery, SD value, SNR, CNR and VR grade) of group A and group B were statistically insignificant (P>0.05). While SD values of group C were comparable to those of group A and B, the rest four parameters of group C were apparently larger, which was statistically significant (tCT value=-12.326,tSNR=-7.136,tCNR=-7.649,ZVR=-2.690,PVR<0.05).Conclusions Image quality could still fit the diagnosis requirements using iDose4 when mAs decreased lower than 50%. The image quality increases when radiation dose is halved at 100 kVp kV. |
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