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应用iDose4软件对低剂量胸部CT增强扫描图像质量的影响
引用本文:李琼,刘士远,于红,张丽,张沉石,姜松.应用iDose4软件对低剂量胸部CT增强扫描图像质量的影响[J].中国介入影像与治疗学,2012,9(10):762-765.
作者姓名:李琼  刘士远  于红  张丽  张沉石  姜松
作者单位:第二军医大学附属长征医院影像科,上海,200003
基金项目:国家自然科学基金(81071155、81171333)、上海市科委科研计划重点项目(10411952800)。
摘    要:目的评价将iDose4迭代重建(IR)技术用于胸部低剂量增强扫描的可行性。方法选取71例体质量指数(BMI)正常(18.5≤BMI〈25.0kg/m2)且接受胸部CT增强扫描的患者,随机分为A组(120kVp,100 mAs)、B组(80kVp,100mAs)、C组(120kVp,50mAs),分别采用iDose4 IR技术和FBP进行重建,记录各组的噪声、SNR、CNR和有效剂量(ED)。按1~3分评价各组总体图像质量,并对3组结果进行比较。结果比较同一个患者的FBP和IR图像,IR技术明显降低了图像的噪声,提高了图像的SNR、CNR。B、C组IR后的图像噪声、SNR和CNR与A组FBP图像比较差异均无统计学意义(P均〉0.05)。B、C组IR后的图像总体质量与A组FBP重建图像质量差异无统计学意义(P〉0.05)。结论运用IR技术进行低剂量胸部CT增强扫描可获得满足诊断要求的图像。

关 键 词:辐射剂量  体层摄影术  X线计算机  胸部  迭代重建  图像质量
收稿时间:2012/6/13 0:00:00
修稿时间:2012/7/31 0:00:00

Evaluation on impact of iDose4 on dose reduction and image quality of low dose contrast-enhance chest CT
LI Qiong,LIU Shi-yuan,YU Hong,ZHANG Li,ZHANG Chen-shi and JIANG Song.Evaluation on impact of iDose4 on dose reduction and image quality of low dose contrast-enhance chest CT[J].Chinese Journal of Interventional Imaging and Therapy,2012,9(10):762-765.
Authors:LI Qiong  LIU Shi-yuan  YU Hong  ZHANG Li  ZHANG Chen-shi and JIANG Song
Institution:Department of Radiology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, China;Department of Radiology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, China;Department of Radiology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, China;Department of Radiology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, China;Department of Radiology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, China;Department of Radiology, Changzheng Hospital, the Second Military Medical University, Shanghai 200003, China
Abstract:Objective To evaluate the feasibility of using iterative reconstruction(IR) algorithm(iDose4) in low dose contrast-enhanced chest CT.Methods Seventy-one patients with normal body mass index(BMI,18.5—25.0 kg/m2) underwent contrast-enhanced chest CT.The patients were randomly assigned into 3 groups: group A,120 kVp/100 mAs;group B,80 kVp/100 mAs;group C,120 kVp/50 mAs.All images were reconstructed using conventional filtered back projection(FBP) and IR.The mean image noise,SNR,CNR and effective dose(ED) with each protocol were assessed.Image quality were graded(scale: 1—3) and compared among 3 groups.Results For the same patient,IR significantly decreased the mean image noise,improved SNR and CNR compared with FBP.The mean image noise,SNR and CNR using IR in group B and C were improved or comparable to those in group A using FBP(all P>0.05).No significant difference was found in subjective image quality between groups B and C using IR,nor with group A using FBP(P>0.05).Conclusion It is feasible to obtain images qualified for diagnosis using IR in low dose contrast-enhanced chest CT examination.
Keywords:Radiation dosage  Tomography  X-ray computed  Chest  Iterative reconstruction  Image quality
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