Application of Dual-source Low-dose Computed Tomography in Common Chest Inspection_West China Medical Journal

Authors：

Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P. R. China;

Corresponding author：

Keywords：

低剂量; 双源CT; 胸部; 扫描

DOI：

10.7507/1002-0179.20130219

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目的　探讨双源CT低剂量扫描技术在胸部普通检查中的应用价值。方法　将2011年8月－2012年12月收治的875例患者依次分为7组，分别采用常规管电流量110 mAs和低管电流量105、100、95、90、85、80 mAs测量，计算并评估7组患者纵隔窗图像的胸骨前空气CT值标准差（SD空气）、肺动脉分叉平面肺动脉信噪比、降主动脉信噪比、肺动脉-竖脊肌对比噪声比、降主动脉-竖脊肌对比噪声比；纵隔窗图像和肺窗图像主观质量评分以及射线剂量指标：CT剂量指数（CTDI）、剂量长度乘积（DLP）、有效剂量（ED）。结果　7组患者纵隔窗图像肺动脉信噪比、降主动脉信噪比、图像主观质量评分和射线剂量CTDI、DLP、ED之间差异均有统计学意义（P＜0.05）；肺动脉-竖脊肌对比噪声比、降主动脉-竖脊肌对比噪声比之间差异无统计学意义（P＞0.05）；其中第7组图像信噪比、射线剂量和主观质量评分均为最低，部分图像肩背部出现横条状伪影，影响肺尖部病变的显示，难以提供足够的诊断信息。结论　胸部普通CT检查，通过阶段性降低管电流量使诊断医生逐渐适应低剂量图像质量，从而普及现有设备的低剂量扫描的方法是可行的。双源CT采用85 mAs的参考管电流量，既能获得满足临床诊断的合格图像，又能明显降低患者群体接受的辐射剂量。

Citation： DENG Liping,LI Zhenlin,YUAN Yuan,LI Yan,CHENG Wei,LI WanJiang,LI Chenjiao.. Application of Dual-source Low-dose Computed Tomography in Common Chest Inspection. West China Medical Journal, 2013, 28(5): 696-700. doi: 10.7507/1002-0179.20130219 Copy

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1. 　Rogolla P, Stover B, Scheer I, et al. Low-dose spiral CT: applicability to paedi atric chest imaging[J]. Pediatr Radiol, 1999, 29(5): 565-569.
2. 　Catalano C, Francone M. Ascareli A, et al. Optimizing radiation-dose and image quality[J]. European Radiology, 2007, 17(6): 26-32.
3. 　Prokop M. Radiation dose in computed tomography: risks and challenges[J]. Radiology, 2008, 48(3): 229-242.
4. 　Wilting JE, Zwartkruis A, van Leeuwen MS, et al. A rational approach to dose reduction in CT: individualized scan protocols. Eur Radiol 2001, 11(12): 2627-2632.
5. 　Cynthia MC, Dianna C, Sue E, et al. The measurement, reporting, and management of radiation dose in CT[R]. American: American Association of Physicists in Medicine, 2008. 13. (Report NO 96).
6. 　Golding SJ, Shrimpton PC. Radiation dose in CT: are we meeting the challenge? [J]. Br J Radiol, 2002, 75: 1-4.
7. 　Chiu CH, Chern MS, Wu MH, et al. Usefulness of low-dose spiral CT of the ches t in regular follow up of postoperative non-small cell lung cancer patients: prel iminary report[J]. Thorac Cardio-vasc Surg, 2008, 125(6): 1300-1305.
8. 　刘绮. 多层螺旋CT低剂量扫描在胸部的临床应用[J]. 放射学实践, 2011, 26(6): 672-674.
9. 　Frush DP, Applegate K. Computed tomography and radiation understanding the issues[J]. J Am Coll Radiol, 2004, 1(2): 113-119．.
10. 　Greess H, Nomayr A, Wolf H, et al. Dose reduction in CT examination of children by an attenuation-based online modulation of tube current (CARE Dose). Eur Radiol 2002, 12(6): 1571-1576.
11. 　余建群, 杨志刚. 多层螺旋CT低剂量扫描对肺门区段支气管显示率的评估[J]. 实用放射学杂志, 2005, 18(6): 21-24.
12. 　Itoh S, Ikeda M, Arahata S, et al. Lung cancer screening: minimum tube current required for helical CT[J]. Radiology, 2000, 215(1): 175-183.
13. 　郑文龙,吴爱琴,许崇永, 等. 成人胸部多层螺旋CT低剂量扫描和防护价值[J]．医学影像学杂志, 2010, 20(2): 182-184．.
14. 　郭俊宇, 黄求理, 张杰, 等. 在健康体检中应用胸部CT低剂量扫描[J]. 现代实用医学, 2011, 23(6): 706-707.
15. 　WHO. Obesity: preventing and managing the global epidemic[R].Geneva: World Health Organization, 2000. (Technical Report Series, No. 894).

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