摘要
目的:对比常规扫描重建与低k V扫描结合SAFIRE技术重建的图像质量,探讨低k V结合SAFIRE重建的价值。方法:健康成年家犬11只,分别行胸部CT常规剂量及低剂量扫描,规定120 k V/65 m A结合FBP重建为常规组,100 k V/65 m A结合SAFIRE(强度3级)重建为低k V组。比较两种方案的辐射剂量,比较所得两组图像的平均CT值、噪声、SNR、CNR及图像质量评分。结果:与常规组比较,低k V组ED降低了39.33%;同种组织平均CT值比较差异无统计学意义(P>0.05);低k V组肺组织、上腔静脉、脊柱旁肌肉噪声均降低,SNR均有升高,上腔静脉-脂肪CNR升高,且差异均有统计学意义(P<0.05)。图像质量评分低k V组较常规组升高约1.70%。结论:家犬胸部低k V扫描联合SAFIRE重建技术可降低辐射剂量并提高图像质量,可指导临床推广运用。
Objective To investigate the value of low tube voltage with sinogram affirmed iterative reconstruction （SAFIRE） through comparing the image quality of regular dose scanning with filtered back projection （FBP） reconstruction and low-dose scanning with SAFIRE. Methods Eleven healthy adult domestic dogs were scanned with different doses. The regular dose of 120 kV/65 mA in combination with FBP reconstruction was set as the normal control group, and 100 kV/65 mA plus SAFIRE reconstruction was used as the low kV group. The CT dose index （CTDI）, dose length product （DLP）, and the effective dose （ED） at different doses were compared, and the average CT value, noise, signal-to-noise ratio （SNR）, contrast-to-noise ratio （CNR） and the image quality score of two groups of images were also analyzed. Results ED in the low kV groups was reduced by 39.33%compared to that in the normal control group. No significant differences were found in the average CT value of the same tissue among these two groups （P 〉 0.05）. Compared with the normal control group, image noise of the lung tissue, superior vena cava and spinal muscle of low kV group were consistently decreased, SNR was in also creased, while the noise ratio contrast between superior vena cava and fat was increased. The image quality score of the low kV group was increased by 1.70%compared to that of the normal control group. Conclusion The low kV scan with SAFIRE technology can decrease the radiation dose and improve image quality in chest CT examination of domestic dogs, with a potential value in the clinical promotion and the application.
出处
《实用医学杂志》
CAS
北大核心
2015年第20期3298-3301,共4页
The Journal of Practical Medicine
基金
贵州省科技厅自然科学基金项目(编号:黔科合同SY字[2011]3057号)
关键词
X线计算机
基于原始数据的迭代重建
胸部
辐射剂量
Tomography,X-ray computed
Sinogram affirmed iterative reconstruction
The chest
Radiation dosage
Tomography,X-ray computed
Sinogram affirmed iterative reconstruction
The chest
Radiation dosage
作者简介
通信作者：曾宪春E—mail：zengxianchun04@foxmail．com
