640层CT冠状动脉造影AIDR3D重建算法的图像质量及辐射剂量评价

发布时间：2018-06-20 13:20

本文选题：体层摄影术 + X线计算机　；参考：《重庆医学》2015年10期

【摘要】：目的评价640层CT冠状动脉造影(CTCA)三维自适应迭代剂量降低(AIDR3D)重建算法的图像质量及辐射剂量。方法连续性84例患者接受640层CT自动曝光扫描冠状动脉造影检查,在图像后处理工作站分别采用AIDR3D、滤波反投影(FBP)算法对扫描的原始图像数据进行重建。2位不知道临床信息及重建算法并且富有经验的影像科医生独立测量、计算2种重建算法CTCA的图像噪声、信噪比和对比噪声比,4等级法定性评价CTCA的图像质量。根据CT机扫描输出的剂量长度乘积计算辐射剂量。统计分析比较2种重建算法CTCA的定量及定性图像质量。结果 AIDR3D重建算法CTCA的图像噪声为(27.20±4.40)HU,较FBP(60.00±12.40)HU减少了46.10%,信噪比21.10±5.10较FBP 11.40±2.80提高了84.70%,对比噪声比24.70±5.10较FBP 13.50±3.20提高了82.20%,二者比较均差异有统计学意义(P0.05)。AIDR3D重建算法冠状动脉近部、中部、远部的图像质量定性评价分数分别为(3.90±0.30)、(3.70±0.50)、(3.60±0.60)分,均高于FBP[分别为(2.60±0.60)、(2.30±0.60)、(2.10±0.70)分],二者比较均差异有统计学意义(P0.05)。AIDR3D、FBP重建算法可以用于诊断的冠状动脉总段数分别为1 216段(96.50%)、504段(40.00%),二者比较差异有统计学意义(P0.05)。平均有效辐射剂量为(2.10±1.00)mSv。结论 640层CTCA AIDR3D重建算法不仅较常规的FBP重建算法的图像噪声显著减少,定量及定性图像质量均明显提高,而且有效辐射剂量低。
[Abstract]:Objective to evaluate the image quality and radiation dose of 3D adaptive iterative dose reduction (AIDR3D) reconstruction algorithm for 640 slice CT coronary angiography (CTCA). Methods A total of 84 consecutive patients were examined by 640 slice CT automatic exposure scanning coronary angiography. In the image post-processing workstation, AIDR3D, filter back-projection FBPalgorithm was used to reconstruct the original image data of scanning. 2 bits of image data were measured independently by an experienced imaging doctor who did not know the clinical information and the reconstruction algorithm. The image quality of CTCA is evaluated qualitatively by calculating the image noise, signal-to-noise ratio and contrast noise ratio of two reconstruction algorithms. The radiation dose was calculated according to the dose length product of CT scan output. The quantitative and qualitative image quality of two reconstruction algorithms CTCA were analyzed and compared statistically. Results the image noise of CTCA of AIDR3D reconstruction algorithm was 27.20 卤4.40HU, which was 46.1010 less than that of FBPU 60.00 卤12.40HU, the SNR was 21.10 卤5.10 higher than that of FBP 11.40 卤2.80, the contrast noise ratio of CTCA was 24.70 卤5.10 and that of FBP 13.50 卤3.20 was 82.20.The difference between them was statistically significant. The scores of qualitative evaluation of image quality in the distal part were 3.90 卤0.30, 3.70 卤0.50 and 3.60 卤0.60, respectively. Both were higher than FBP [2.60 卤0.60 + 0.60 + 2.10 卤0.70], there were significant differences between the two groups. The number of total coronary artery segments that could be used for diagnosis by P0.05N. AIDR3DBP reconstruction algorithm was 1 216 segment, 96.505 segment (40.005%), respectively. There was significant difference between the two groups (P 0.05). The average effective radiation dose was 2.10 卤1.00 mSv. Conclusion the image noise of 640 layer CTCA AIDR3D reconstruction algorithm is significantly lower than that of conventional FBP reconstruction algorithm, the quality of quantitative and qualitative images is improved obviously, and the effective radiation dose is low.
【作者单位】：中山大学附属第六医院放射科;重庆市肿瘤研究所放射科;
【分类号】：R816.2

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