| 肖梦强,张萌,刘金丰,周桂忠,雷鸣,徐旺东.迭代算法低剂量CT诊断腰椎间盘突出[J].中国医学影像技术,2017,33(3):458~461 |
| 迭代算法低剂量CT诊断腰椎间盘突出 |
| Iterative reconstruction combined with low dose CT in diagnosis of lumbar intervertebral disc hernia |
| 投稿时间：2016-08-12 修订日期：2016-11-12 |
| DOI：10.13929/j.1003-3289.201608053 |
| 中文关键词: 体层摄影术,X线计算机 椎间盘移位 辐射剂量 |
| 英文关键词:Tomography, X-ray computed Intervertbral disk displacement Radiation dosage |
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| 中文摘要: |
| 目的 评价迭代算法（AIDR 3D）和滤波反投影算法（FBP）联合低剂量CT扫描评估腰椎间盘突出的价值。方法 将150例患者随机分为A~E 5组，每组30例，A~D组扫描管电压为120 kV，管电流分别为 100 mAs、50 mAs、30 mAs、20 mAs，E组管电压为80 kV、管电流为100 mAs。对每组图像分别进行AIDR 3D和FBP重建，比较不同重建方法各组图像的噪声、SNR及CNR。并采用3分法对图像质量进行主观评分，评分 ≥ 2为诊断可接受图像质量，比较各组图像椎间盘突出的显示能力。结果 在不同扫描条件下，采用AIDR 3D重建的图像噪声、SNR、CNR及椎间盘突出的显示情况方面均优于FBP。同一重建技术条件下，随辐射剂量减低，噪声升高、SNR和椎间盘突出显示能力降低；除采用AIDR 3D的50 mAs组CNR略低于30 mAs组外，其余各组随剂量减低，CNR降低；同一剂量下两种重建技术采用降低管电流得到的图像质量优于降低管电压的方式。结论 采用AIDR 3D重建方法联合低剂量CT扫描诊断椎间盘突出有一定的价值。 |
| 英文摘要: |
| Objective To explore the value of iteration algorithm (AIDR 3D) and filter-back projection (FBP) combined with CT low dose scanning in evaluation of lumbar intervertebral disc hernia. Methods Totally 150 patients with lumbar degenerative osteoarthropathy were randomly divided into A-E groups, with 30 cases in each group. Scanning parameters of A-D groups were 120 kV of tube voltage, and 100 mAs, 50 mAs, 30 mAs, as well as 20 mAs of tube current. While parameters of group E were 80 kV of tube voltage and 100 mAs of tube current. Each group was reconstructed with FBP and AIDR 3D, respectively, and their noises, SNRs and CNRs of groups were compared. And 3-point evaluation method was used to score the imaging, while score ≥ 2 were acceptable image quantity for clinical imaging. Results Under different radiation doses, AIDR 3D reconstruction images were superior to FBP in noise, SNR, CNR and display of intervertebral disc hernia. Under the same reconstruction technology, with the reduction of dose, noise increased, SNR and display of intervertebral disc hernia decreased. Except for slightly lower in AIDR 3D reconstruction with 50 mAs than that with 30 mAs, CNR decreased with the reduction of dose.Two reconstruction technologies under the same dose, image quality of reducing the tube current were better than that of lowering the tube voltage. Conclusion It is valuable of AIDR 3D combined with CT low dose scanning in evaluation on lumbar intervertebral disc hernia. |
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