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首页> 外文期刊>Academic radiology >Subtraction CT angiography of the lower extremities: single volume subtraction versus multi-segmented volume subtraction.
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Subtraction CT angiography of the lower extremities: single volume subtraction versus multi-segmented volume subtraction.

机译：下肢减影CT血管造影：单体积减影与多节体积减影。

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RATIONALE AND OBJECTIVES: To validate the hypothesis that a multisegmented approach during subtraction computed tomography (CT) angiography of the lower extremities can improve bone removal efficiency by suppressing regional motion. MATERIALS AND METHODS: The institutional review board of our hospital approved this retrospective study. One hundred and one consecutive patients that had undergone the lower extremity CT angiography were included in this study. Subtraction CT angiography was performed using two different methods, namely, by single volume subtraction and by multisegmented volume subtraction. Multisegmented volume subtraction was conducted by dividing the whole volume of the CT data into three segments along the z axis of the lower extremities, performing a subtraction process for each segment, and combining segments to form as single subtracted volume. The bone removal efficiencies of the two methods was assessed by analyzing bone subtraction scores on maximum intensity projection (MIP) images for each bone segment in a blinded fashion. In addition, overall MIP image qualities were compared by displaying MIP images produced using the two methods side by side. Differences between bone subtraction scores were tested using Wilcoxon's signed rank test. RESULTS: Multisegmented volume subtraction MIP images demonstrated significantly better bone removal for the following bone segments: pelvis (P < .0001), hip (P = .0002), thigh (P = .0258), knee (P = .0004), ankle (P = .0008), metatarsal bone (P < .0001), and toes (P < .0001). Overall bone subtraction score and subjective image qualities determined by performing side-by-side comparisons were better for the multisegmented volume subtraction method. CONCLUSION: Bone removal performance and overall MIP image quality can be increased by adopting multisegmented volume subtraction during subtraction CT angiography of the lower extremities.
机译：理由和目的：验证以下假设：下肢减影计算机断层扫描（CT）血管造影期间采用多段方法可以通过抑制局部运动来提高除骨效率。材料与方法：我们医院的机构审查委员会批准了这项回顾性研究。这项研究包括了连续接受下肢CT血管造影的110例患者。减影CT血管造影使用两种不同的方法进行，即通过单体积减影和多节体积减影。通过将CT数据的整个体积沿下肢的z轴划分为三个片段，对每个片段执行减法过程，然后组合片段以形成单个减法体积，进行多片段体积减法。通过以盲法分析每个骨段的最大强度投影（MIP）图像上的骨扣除分数，评估了这两种方法的骨去除效率。另外，通过并排显示使用两种方法生成的MIP图像，比较了总体MIP图像质量。使用Wilcoxon的带符号秩检验来检验骨相减分数之间的差异。结果：多段容积减影MIP图像显示以下骨段的骨清除效果显着改善：骨盆（P <.0001），臀部（P = .0002），大腿（P = .0258），膝盖（P = .0004）脚踝（P = .0008），meta骨（P <.0001）和脚趾（P <.0001）。对于多段体积减影法，通过并排比较确定的总体骨减影得分和主观图像质量更好。结论：在下肢减影CT血管造影过程中采用多节体积减影可以提高去骨性能和整体MIP图像质量。

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