| 王会霞,岳松伟,吕培杰,武卫杰,高剑波.对比分析两种胸部能谱CT虚拟平扫图像与常规平扫图像[J].中国医学影像技术,2019,35(9):1409~1413 |
| 对比分析两种胸部能谱CT虚拟平扫图像与常规平扫图像 |
| Comparative analysis of two kinds of virtual unenhanced technique of spectral CT and routine plain CT in thorax |
| 投稿时间：2018-12-03 修订日期：2019-06-28 |
| DOI：10.13929/j.1003-3289.201812006 |
| 中文关键词: 胸部 体层摄影术,X线计算机 虚拟平扫技术 图像质量 |
| 英文关键词:thorax tomography, X-ray computed virtual unenhanced technique image quality |
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| 摘要点击次数: 2264 |
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| 中文摘要: |
| 目的 比较虚拟平扫图像（VUE）和抑碘图像（MSI）与常规CT平扫图像（TUE）质量，观察能谱CT虚拟平扫技术在胸部CT成像中的应用价值。方法 前瞻性收集40例患者行胸部平扫联合增强检查，采用常规扫描模式获得胸部TUE，以GSI Assist模式行双期增强扫描。采用VUE技术基于原始数据重建动脉期、静脉期虚拟平扫图像（AP-VUE、VP-VUE），通过后处理抑碘技术获得双期抑碘图（AP-MSI、VP-MSI）。测量胸主动脉、肺动脉、竖脊肌及胸壁皮下脂肪CT值及其标准差（SD值），并计算CNR，采用5分法对图像进行主观评分，以单因素方差分析及Kruskal-Wallis H法、Mann-Whitney U法进行统计学分析。结果 AP-MSI肺动脉及胸主动脉CT值与TUE比较差异有统计学意义（P均<0.005），VP-MSI及双期VUE各部位CT值、CNR值及SD值与TUE间差异无统计学意义（P均>0.005）。双期MSI及AP-VUE图像各项主观评分均低于TUE（P均<0.005），VP-VUE图像各项主观评分与TUE比较差异均无统计学意义（P均>0.005）。虚拟平扫较常规平扫辐射剂量降低19.29%。结论 VUE技术可在降低辐射剂量的同时获得较MSI更好的图像质量，尤其VP-VUE与TUE图像质量相当，有代替常规胸部平扫的潜能。 |
| 英文摘要: |
| Objective To investigate image quality of virtual unenhanced images (VUE) and material suppressed iodine images (MSI) compared with true unenhanced images (TUE), and to explore the application value of virtual unenhanced technique in chest CT scanning. Methods Forty patients underwent conventional unenhanced CT and contrast-enhanced CT with spectral imaging mode, and dual-phase enhanced scanning with GSI Assist mode was performed. VUE based on initial data and MSI based on contrast-enhanced images during arterial phase (AP) and venous phase (VP) were generated, respectively. CT values and standard (SD), CNR of thoracic aorta, pulmonary artery, erector spinae muscle and fat and qualitative visual parameters (image quality as graded on a 5-point scale) were compared. Statistical analysis was performed with One-way ANOVA, Mann-Whitney U test and Kruskal-Wallis H tests. Results CT value of pulmonary artery and thoracic aorta in AP-MSI were significantly different with those in TUE (both P<0.005). Compared with TUE, there was no significant difference of CT value, SD nor CNR in AP-VUE, VP-VUE and VP-MSI (all P>0.05). Compared with TUE, qualitative visual parameters had no difference with VP-VUE (all P>0.005), which were lower in AP-VUE, AP-MSI and VP-MSI (all P<0.005). The radiation dose reduced by 19.29% with VUE compared with TUE. Conclusion Using VUE could acquire better image quality than MSI with reducing radiation dose. VP-VUE has similar image quality to TUE, which has potential to replace TUE. |
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