| 夏巍,尹肖睿,周媛,等.低管电压结合低对比剂量技术在颈部CTA检查中的应用[J].中华放射医学与防护杂志,2014,34(11):872-875.Xia Wei,Yin Xiaorui,Zhou Yuan,et al.Application of low tube voltage combined with low contrast agent in the neck CTA examination[J].Chin J Radiol Med Prot,2014,34(11):872-875 |
| 低管电压结合低对比剂量技术在颈部CTA检查中的应用 |
| Application of low tube voltage combined with low contrast agent in the neck CTA examination |
| 投稿时间：2013-11-26 |
| DOI：10.3760/cma.j.issn.0254-5098.2014.11.021 |
| 中文关键词: 辐射剂量 体层摄影术 血管造影 静脉伪影 |
| 英文关键词:Radiation dose Tomography Angiography Venous artifact |
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| 中文摘要: |
| 目的 评价低管电压扫描方法结合精确计算对比剂量与常规扫描方法在颈部CT血管造影(CTA)辐射剂量及图像质量上的差异.方法 前瞻性连续选择2012年10月至2013年6月颈部CTA受检患者90例.随机数字表法分为A、B、C组,每组30例,分别为A组(常规组):120 kV,对比剂用量70~80 ml;B组:100 kV,精确计算对比剂用量; C组: 80 kV,精确计算对比剂用量.分别对各组辐射剂量、对比剂用量、对比噪声比(CNR)进行单因素方差分析.由两名资深影像学医师以5分制对3组的图像质量进行主观评价.结果 B与C组的有效剂量较A组明显下降,分别为(6.6±0.9)、(4.5±0.7)和(2.1±0.4)mSv,差异有统计学意义(F=72.4,P<0.05);B与C组的对比剂用量较A组均明显下降(73.2±8.2)、(48.2±5.1)和(48.6±5.4)ml,差异均有统计学意义(F=56.8,P<0.05).B组与C组较A组CNR分别提高42.2%、64.8%,差异有统计学意义(F=72.6,P<0.05).A组中有10例患者的图像出现静脉伪影对影像质量有不同程度的影响,B组与C组均未出现静脉伪影.结论 采用精确计算对比剂量结合80 kV扫描方法与常规组相比较不仅辐射剂量与对比剂用量大幅降低,并且图像质量得到提高. |
| 英文摘要: |
| Objective To evaluate the differences in image quality and radiation dose in the neck CTA between low tube voltage scanning method combined with exact calculation of contrast dosage and conventional scanning methods. Methods Ninety patients who had undergone neck CTA examination from October 2012 to June 2013 were prospectively selected to perform study. Patients were randomly divided into Group A, B and C, each with 30 cases. Tube voltage and contrast amount were, respectively, 120 kV and 70-80 ml for Group A (conventional group), 100 kV and exact calculation for Group B, 80 kV and exact calculation for Group C. Using ANOVA test, radiation dose, contrast amount, CNR were statistically analyzed among three groups. Subjective evaluations were made of image quality by two experienced radiologists based on a 5-point system. Results The effective doses in Group B and C were (4.5±0.7)mSv and (2.1±0.4)mSv, respectively, significantly lower than (6.6±0.9) mSv in Group A, with statistically significant difference(F=72.4, P<0.05). The amounts of contrast were significantly lower in Group B and C than that in Group A, which respectively were (73.2±8.2) ml for Group A and (48.2±5.1) for Group B and (48.6±5.4) ml for Group C, with statistically significant difference (F=56.8, P<0.05). CNRs increased respectively by 42.2% in Group B and by 42.2% in Group C compared with Group A, with statistically significant difference (F=72.6, P<0.05). Venous artifact images were found in 10 patients of Group A, having different effects on image quality, whereas in Group B and C, there were not vein artifacts to found. Conclusions The low tube voltage (80 kV) scanning method combined with exact calculation of contrast features not only significantly lower radiation dose and lower contrast amount used, but also improved image quality in comparison with conventional method. |
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