| 赵宏亮,石明国,宦怡,李剑,郑敏文.双源CT大螺距扫描结合正弦图迭代重建技术在小儿先天性心脏病的应用[J].中国医学影像技术,2014,30(10):1569~1573 |
| 双源CT大螺距扫描结合正弦图迭代重建技术在小儿先天性心脏病的应用 |
| Application of dual-source CT angiography of high-pitch combined with sinogram-affirmed iterative reconstruction in congenital heart disease children |
| 投稿时间：2014-04-17 修订日期：2014-07-13 |
| DOI： |
| 中文关键词: 心脏缺损, 先天性 体层摄影术, 螺旋计算机 辐射剂量 |
| 英文关键词:Heart defects, congenital Tomography, spiral computed Radiation dosage |
| 基金项目: |
|
| 摘要点击次数: 2220 |
| 全文下载次数: 736 |
| 中文摘要: |
| 目的 探讨双源CT大螺距扫描结合正弦图迭代重建（SAFIRE）技术在小儿先天性心脏病（简称先心病）低辐射剂量成像中的可行性。方法 选取96例心脏超声或临床拟诊复杂先心病患儿，随机分为A组、B组，每组48例，2组均行双源CT大螺距并前瞻性心电触发扫描。A组管电压采用80 kV，管电流按体质量分别设置，采用滤波反投影（FBP）重建；B组管电压与A组相同，管电流根据体质量设置为A组的50%，采用SAFIRE。分别测量并记录两组图像中升主动脉、降主动脉、主肺动脉及左心室的平均CT值及噪声（SD），并计算SNR及对比噪声比（CNR），由2名影像学医师以5分法主观评价图像质量。记录两组患儿的容积CT剂量指数（CTDIvol）、剂量长度乘积（DLP）值，计算有效辐射剂量（ED）。结果 两组患儿相同层面CT值、SD、SNR及CNR值差异均无统计学意义（P均>0.05）。两组图像的主观图像质量中位数评分均为4分（Z=1.02，P=0.31），图像质量评分评价者间一致性极好（Kappa=0.84，P<0.05）。A组、B组ED分别为（0.18±0.05）mSv、（0.09±0.03）mSv（P<0.05），B组ED较A组降低约50%。结论 对先心病患儿采用双源CT大螺距扫描联合SAFIRE技术的图像质量满足诊断要求，且可降低扫描剂量。 |
| 英文摘要: |
| Objective To explore the feasibility of low radiation dose in children with congenital heart disease (CHD) by combination of high-pitch dual-source CT and sinogram-affirmed iterative reconstruction (SAFIRE). Methods Totally 96 children with CHD conformed by echocardiograph or clinical diagnosis were divided into group A and group B (each n=48) randomly. Then high-pitch dual-source CT prospective ECG-triggered heart angiography was performed. In group A, the tube voltage was 80 kV and the tube current was modulated according to the weight of the patients, and images were reconstructed with filtered back projection (FBP). While in group B, the tube voltage was similar to group A and the tube current was half of group A. While images in group B were reconstructed with SAFIRE. CT value and noise (SD) were measured in ascending aorta, descending aorta, the main pulmonary artery and left ventricular cavity, respectively. Then the corresponding SNR and CNR were calculated. Two experience radiologists assessed the overall image quality by a five point scale independently. CT dose index volume (CTDIvol) and dose length product (DLP) in two groups were recorded, and then effective radiation dose (ED) was computed. Results There was no significant difference in CT value, SD, SNR, CNR at the same cardiovascular anatomical regions (P>0.05). The median of image quality score was 4 in both groups (Z=1.02, P=0.31). Interobserver agreement was excellent for two groups (Kappa=0.84, P<0.05). The ED in group A and B was (0.18±0.05)mSv and (0.09±0.03)mSv (P<0.05). The ED in group B reduced about 50% compared with group B. Conclusion The image quality obtained from high-pitch dual-source CT combined with SAFIRE in CHD children can meet the diagnostic requirements, which can significantly reduce radiation dose. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
