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Iterative reconstructions versus filtered back-projection for urinary stone detection in low-dose CT

机译：迭代重建与低剂量CT中泌尿石检测的过滤后投影

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摘要

Rationale and Objectives: To evaluate prospectively, in patients with suspected or known urinary stone disease, the image quality anddiagnostic confidence of nonenhanced abdominal low-dose computed tomography (CT) with iterative reconstruction (IR) compared to filtered back-projection (FBP). Materials and Methods: Fifty consecutive patients with suspected ( n=33) or known ( n=17) urinary stone disease underwent nonenhanced abdominal low-dose CT (120 kVp, 30 effective mAs, 1.6±0.5 mSv). Reconstructions were performed with sinogram-affirmed IR and with FBP. Attenuation (in Hounsfield units) was measured in subcutaneous fat and urinary bladder; image noise was determined. Two readers assessed image quality, number and location of urinary calculi were recorded, and diagnostic confidence was assessed. Statistical analyses included Mann-Whitney, Friedman's two-way, Wilcoxon signed rank, Pearson's, and Spearman's rank order correction tests. Results: Attenuation of urinary bladder ( P=.208, reader 1; P=.123, reader 2) and fat ( P=.568, reader 1; P=.834, reader 2) was similar among FBP and IR datasets. Image noise was reduced in IR datasets by 40.1% ( P<.001). IR improved image quality ( P<.01), and obesity as factor impairing image quality was noted in FBP but not in IR images ( P<.05). There was no significant difference in number of calculi in datasets reconstructed with IR and FBP ( P=.102, reader 1; P=.059, reader 2). Diagnostic confidence regarding identification of urinary calculi improved with IR ( P<.05, reader 1; P<.01, reader 2). Conclusion: IR improves image quality and confidence for diagnosing urinary stone disease in abdominal low-dose CT.
机译：理由和目标：预期评估，在涉嫌或已知的泌尿石疾病的患者中，与过滤后投影（FBP）相比，逆向腹部低剂量计算断层扫描（CT）的图像质量和抗症状低剂量计算断层扫描（CT）。材料和方法：五十连续疑似患者（n = 33）或已知（n = 17）尿石疾病接受了非育腹低剂量CT（120 kVp，30 kVp，有效Mas，1.6±0.5msv）。用宿纪肯定的IR和FBP进行重建。在皮下脂肪和膀胱中测量衰减（在Hounsfield单位）;确定图像噪声。评估了两个读者评估了图像质量，记录了泌尿元计算的数量和位置，并评估了诊断信心。统计分析包括Mann-Whitney，Friedman的双向，Wilcoxon签名等级，Pearson和Spearman的排名校正测试。结果：膀胱衰减（P = .208，读者1; P = .123，读者2）和脂肪（P = .568，读者1; P = .834，读者2）在FBP和IR数据集之间类似。 IR数据集中的图像噪声减少了40.1％（P <.001）。 IR改善图像质量（P <.01），并且在FBP中注意到图像质量的因子损害的肥胖，但不在IR图像中（P <.05）。与IR和FBP重建的数据集中的计算数量没有显着差异（P = .102，读者1; p = .059，读者2）。关于IR（P <.05，读取器1; P <.01，阅读器2）改善尿析鉴定的诊断信心。结论：IR提高了腹部低剂量CT中泌尿石病的图像质量和信心。

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  • 来源
    《Academic radiology》 |2013年第11期|共7页
  • 作者

    WinklehnerA.; BlumeI.; WinklhoferS.; EberliD.; GnanntR.; FrauenfelderT.; AlkadhiH.;

  • 作者单位

    Institute of Diagnostic and Interventional Radiology University Hospital Zurich Raemistrasse 100;

    Institute of Diagnostic and Interventional Radiology University Hospital Zurich Raemistrasse 100;

    Institute of Diagnostic and Interventional Radiology University Hospital Zurich Raemistrasse 100;

    Department of Urology University Hospital Zurich Raemistrasse 100 CH-8091 Zurich Switzerland;

    Institute of Diagnostic and Interventional Radiology University Hospital Zurich Raemistrasse 100;

    Institute of Diagnostic and Interventional Radiology University Hospital Zurich Raemistrasse 100;

    Institute of Diagnostic and Interventional Radiology University Hospital Zurich Raemistrasse 100;

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  • 正文语种 eng
  • 中图分类 放射医学;
  • 关键词

    Computed tomography; Iterative reconstruction; Low radiation dose; Urinary stone disease;

    机译：计算断层扫描;迭代重建;低辐射剂量;泌尿石病;

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