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低管电压联合迭代模型重建技术在肝脏CT增强扫描中的可行性研究 被引量:6

Feasibility study of contrast-enhanced hepatic CT with low tube voltage using iterative model reconstruction technique
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摘要 目的 探讨低管电压联合迭代模型重建(IMR)技术在肝脏CT增强扫描中的可行性.方法 60例患者按随机数字表法分为A组和B组,每组30例.扫描方案A组动脉期100 kV,门静脉期120 kV,B组动脉期120 kV,门静脉期100 kV.各组管电流均固定为250 mAs.A组动脉期和B组门静脉期采用IMR,A组门静脉期和B组动脉期采用滤波反投影(FBP)重建,得到4组图像,包括A1组(动脉期,100 kV,IMR),B1组(动脉期,120 kV,FBP),A2组(门静脉期,120 kV,FBP)以及B2组(门静脉期,100 kV,IMR).分别比较A1组和B1组,A2组和B2组的图像质量客观评价指标[图像噪声、图像信噪比(SNR)、对比噪声比(CNR)]和主观评价指标(低对比分辨力、病灶边缘锐利度、图像失真及诊断信心度),并计算有效剂量.结果 有效剂量A1组较B1组、B2组较A2组明显下降(t =11.05、11.64,P<0.01).低对比分辨力、病灶边缘锐利度A1优于B1组、B2优于A2组(Z=6.391、3.200、6.559、3.409,P<0.01),图像失真和诊断信心差异无统计学意义(P>0.05).图像噪声A1组低于B1组,B2组低于A2组(t=12.889、15.163,P<0.01),SNR和CNR A1组高于B1组,B2组高于A2组(t=15.458、1.325、15.308、3.136,P<0.01).结论 与常规管电压FBP重建相比,低管电压联合IMR重建可显著降低肝脏增强CT的辐射剂量,并提高其图像质量. Objective To investigate the feasibility of contrast-enhanced CT with low tube voltage using iterative model reconstruction (IMR) technique.Methods Sixty patients were randomly assigned into 2 groups (group A and group B, 30 each) according to random number table.All patients underwent contrast-enhanced hepatic CT.Group A was scanned with 100 kV at arterial phase(AP) and 120 kV at portal vein phase (PVP), while group B was scanned with 120 kV at AP and 100 kV at PVP.All protocols were performed at the same tube current of 250 mAs.Raw data were reconstructed with IMR for AP images in group A and PVP images in group B;and reconstructed with FBP for AP images in group B and PVP images in group A.Images of 4 different groups were obtained: A1(AP,100 kV,IMR) , B1(AP,120 kV, FBP), A2(PVP, 120 kV,FBP) and B2(PVP, 100 kV, IMR).Subjective evaluation indexes for image quality including low-contrast detectability, lesion edge sharpness, image distortion and diagnostic confidence.Objective evaluation indexes included CT attenuation of hepatic parenchyma, image noise, SNR and CNR, which were assessed and compared between groups A1 and B1, groups A2 and B2.Effective radiation doses were calculated.Results Effective dose in group A1 was reduced 35.1% compared toB1 (t=ll.05, P〈0.01), while a reduction of 37.7% in group B2 compared to A2 (t=11.64,P 〈 0.01).Subjective image quality score of low-contrast detectability and lesion edge sharpness were significantly higher in group A1 compared to B1 (Z =6.391, 3.200, P 〈 0.01), as well as in group B2 compared to A2 (Z =6.559, 3.409, P 〈 0.01).No differences were found in image distortion and diagnostic confidence between groups A1 and B1, groups A2 and B2, respectively (P 〉 0.05).Significantly lower image noise and higher SNR/CNR were found in group A1 compared to group B1 (t =12.889, 15.458, 1.325, P 〈 0.01) , as well as in group B2 compared to group A2(t =15.163, 15.308, 3.136, P 〈0.01).Conclusions Significan
作者 程强 刘洋 姜彦 杨学华 高剑波 张永高 董雷钢 Cheng Qiang, Liu Yang, Jiang Yan, Yang Xuehua, Gao Jianbo, Zhang Yonggao, Dong Leigang (No. 1 Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China)
出处 《中华放射医学与防护杂志》 CAS CSCD 北大核心 2015年第12期953-956,共4页 Chinese Journal of Radiological Medicine and Protection
关键词 模型迭代重建算法 肝脏 体层摄影术 X线计算机 辐射剂量 图像质量 Iterative model reconstruction(IMR) Hepatic Tomography, X-ray computed Radiation dosage Image quality
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  • 1Mettler FA Jr, Thomadsen BR, Bhargavan M, et al. Medical radiation exposure in the U. S. in 2006: preliminary Results. Health Phys, 2008,95 (5) : 502-507. 被引量:1
  • 2Valentin J. International commission on radiation protection. Managing patient dose in multidetector computed tomography (MDCT) : ICRP Publication 102. Ann ICRP, 2007,37(1) : 1-79. 被引量:1
  • 3McCollough CH, Bruesewitz MR, Kofler JM Jr. CT dose reduction and dose management tools: overview of available options. Radio Graphics, 2006,26(2) : 503-512. 被引量:1
  • 4Kalra MK, Maher MM, Toth TL, et al. Radiation from "extra" images acquired with abdominal and/or pelvic CT: effect of automatic tube current modulation. Radiology, 2004, 232 (2): 409- 414. 被引量:1
  • 5Hara AK, Paden RG, Silva AC, et al. Iterative reconstruction technique for reducing body radiation dose at CT: feasibility study. AIR Am J Roentgenol, 2009,193(3) :764-771. 被引量:1
  • 6Prakash P, Kalra MK, Digumarthy SR, et al. Radiation dose reduction with chest computed tomography using adaptive statistical iterative reconstruction technique: initial experience. J Comput Assist Tomogr, 2010,34(1) : 40-45. 被引量:1
  • 7Marin D, Nelson RC, Schindera ST, et al. Low-tube-voltage, high-tube-current multidetector abdominal CT: improved image quality and decreased radiation dose with adaptive statistical iterative reconstruction algorithm-initial clinical experience. Radiology, 2010,254(1):145-153. 被引量:1
  • 8Prakash P, Kalra MK, Kambadakone AK, et al. Reducing abdominal CT radiation dose with adaptive statistical iterative reconstruction technique. Invest Radiol, 2010,45(4):202-210. 被引量:1
  • 9Flicek KT, Hara AK, Silva AC, et al. Reducing the radiation dose for CT eolonography using adaptive statistical iterative reconstruction: A pilot study. AJR Am J Roentgenol, 2010, 195 (1) :126-131. 被引量:1
  • 10Hutton B, Nuyts J, Zaidi H. Iterative reconstruction methods //s. n. Quantitative analysis in nuclear medicine imaging. Singapore: Springer Science+Business Media, 2006 : 107-140. 被引量:1

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