家犬胸部低管电压扫描结合迭代重建SAFIRE技术的运用

发布时间：2018-01-28 11:00

本文关键词： X线计算机基于原始数据的迭代重建胸部辐射剂量　出处：《实用医学杂志》2015年20期 　论文类型：期刊论文

【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(P0.05);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(P0.05)。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。
[Abstract]:Objective: to compare the image quality of conventional scan reconstruction with low kV scan combined with SAFIRE technique, and to evaluate the value of low KV and SAFIRE reconstruction. Methods: 11 healthy adult dogs were used. Conventional and low-dose chest CT scans were performed, and 120kV / 65mA combined with FBP reconstruction was prescribed as the routine group. 100kV / 65mA combined with SAFIRE3 was reconstructed into low KV group. The radiation doses of the two schemes were compared, and the average CT value and noise of the two groups were compared. Results: compared with the normal group, Ed in the low kV group decreased by 39.33. There was no significant difference in the average CT value of homologous tissues (P 0.05). In low KV group, the noise of lung tissue, superior vena cava and paraspinal muscles were all increased, and the CNR of superior vena cava and fat were increased. The difference was statistically significant (P0.05). The image quality score of low KV group was 1.70 higher than that of the normal group. Conclusion: low chest low kV scan combined with SAFIRE reconstruction can reduce the radiation dose and improve the image quality. It can guide clinical application.
【作者单位】：贵州省人民医院放射科;
【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)
【分类号】：R816.4
【正文快照】： 随着多层螺旋CT迅速发展和广泛普及,CT检查的辐射剂量问题亦受到医学界和公众的关注[1-3]。ALARA(as low as reasonably achievable)原则是CT辐射剂量的指导性原则[4]。早期低剂量研究的重点多为扫描技术参数的优化[5],近期已转为联合重建算法以求在降低辐射剂量的同时提高图

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