| 潘宇宁,黄求理,任大卫,等.320层容积CT超低剂量扫描在冠状动脉成像中的应用[J].中华放射医学与防护杂志,2012,32(4):420-424,435.PAN Yu-ning,HUANG Qiu-li,REN Da-wei,et al.Application value of low radiation dose coronary angiography using 320-slice volume CT[J].Chin J Radiol Med Prot,2012,32(4):420-424,435 |
| 320层容积CT超低剂量扫描在冠状动脉成像中的应用 |
| Application value of low radiation dose coronary angiography using 320-slice volume CT |
| 投稿时间：2011-12-19 |
| DOI：10.3760/cma.j.issn.0254-5098.2012.04.025 |
| 中文关键词: 320层容积CT扫描 冠状动脉成像 噪声 辐射剂量 |
| 英文关键词:320-slice volume CT Coronary angiography Noise Radiation dose |
| 基金项目:宁波市社会发展科研项目(2011C50075) |
|
| 摘要点击次数: 4395 |
| 全文下载次数: 2514 |
| 中文摘要: |
| 目的 评价320层CT冠状动脉成像中前瞻性轴面容积扫描不同kV设置对辐射剂量及图像质量的影响,探讨<1 mSv冠状动脉检查的可行性及应用价值。方法 从拟行冠状动脉成像的患者中连续选取80例,随机分成A、B两组各40例,A组扫描时管电压为100 kV,B组为120 kV。A组经AIDR软件重建后成为A1组。比较A、B两组升主动脉根部平均强化CT值(SI)、噪声(SD)、信噪比(SNR)、对比信噪比(CNR)、有效辐射剂量(E)及图像质量评分。分别比较A、A1和B、A1组间患者SI、SD、SNR、CNR及图像质量评分。结果 A组有效辐射剂量为(0.67±0.18)mSv,B组为(3.08±1.04)mSv(t=-14.30,P<0.05),平均减少了78%。A、B两组的图像质量评分分别为(4.57±0.57)和(4.59±0.59)分(t=-1.17,P>0.05)。A、B组SI、SD、SNR、CNR分别为(570.8±131.5)HU、25.1±6.9、24.5±9.1、19.8±6.1和(460.6±14.3)HU、15.1±3.6、31.7±7.7、29.3±6.8。两组SI、SD比较, A组大于B组,差异有统计学意义(t=4.49、8.18,P<0.05);SNR、CNR A组小于B组,差异有统计学意义(t=-4.24、-6.19,P<0.05)。A1组SI、SD、SNR、CNR、图像质量评分为(557.9±24.5)HU、21.1±6.0、27.7±10.0、23.4±7.8、(4.60±0.56)分,与A组相比,SI、图像质量评分差异无统计学意义(t=1.09、-1.90,P>0.05);SD、SNR、CNR差异有统计学意义(t=-5.97、-4.18、-6.22,P<0.05)。结论 320层CT冠状动脉成像前瞻性轴面容积扫描中,采用100 kV管电压扫描,其辐射剂量可降到1 mSv以下,并且图像质量达到诊断要求。 |
| 英文摘要: |
| Objective To evaluate the image quality and radiation dose of prospective electrocardiography-triggered coronary 320-slice volume CT angiography with different kV, and the feasibility of coronary scan with <1 mSv radiation dose.Methods Eighty consecutive patients were randomly divided into two groups equally.The tube voltage according to paradigm was 100 kV in group A and 120 kV in group B. All raw data in group A was reconstructed by the software AIDR in CT system to create a new group named as A1. Such parameters as the mean intraluminal attenuation (SI), noise (SD), signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR),effective radiation dose(E) and image quality score measured in group A were compared with those in group B. The values such as SI, SD, SNR, CNR, image quality scores were compared between group A and group A1. The significance of group B and group A1 was compared in SI, SD, SNR, CNR, image quality scores as well. Results E in group A was significantly lower than that in group B[E=(0.67 ± 0.18) mSv in group A vs. E=(3.08 ± 1.04) mSv in group B]. The value of E in group A was decreased by 78% compared to group B(t=-14.30, P<0.05). There was no significant difference in mean image quality scores between two groups(4.57 ± 0.57 in group A vs. 4.59 ± 0.59 in group B, t=-1.17, P>0.05). The values of SI, SD, SNR, CNR in group A were (570.8±131.5)HU, 25.1±6.9, 24.5±9.1, 19.8±6.1. And the values of SI, SD, SNR, CNR in group B were (460.6 ± 14.3) HU, 15.1±3.6, 31.7±7.7, 29.3±6.8. The values of SI and SD in group A were significantly higher than those in group B(t=4.49,8.18, P<0.05). The values of SNR and CNR in group A were lower than those in group B (t=-4.24,-6.19, P<0.05). The values of SI,SD, SNR, CNR,image quality scores in group A1 were (557.9±24.5) HU, 21.1±6.0, 27.7±10.0, 23.4±7.8, 4.60 ± 0.56. There was no difference in the SI and the image quality scores between group A and group A1 (t=1.09,-1.90, P>0.05). Conclusions 320-slice volume CT with 100 kV tube voltage and prospective ECG-triggered technique can reduce the radiation dose to less than 1 mSv and obtain optimal images in diagnosis of coronary arterial diseases. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|