ASIR-Ⅴ重建算法在高原地区低剂量头颈CTA检查中的应用  

Application of Iterative Algorithm ASIR-V in Low-dose Head and Neck CTA Examination in Plateau Area

作　　者：李春辉 次旦旺久[1] 边巴次仁 王先涛[1] 尼玛卓嘎[1] 张鹏[1] 雷彦明[1] LI Chun-hui;Cidanwangjiu;Bianbaciren;WANG Xian-tao;Nimazhuoga;ZHANG Peng;LEI Yan-ming(Department of Radiology,Tibet Autonomous Region People's Hospital,Lhasa 850000,Xizang Autonomous Region,China)

机构地区：[1]西藏自治区人民医院放射科,西藏拉萨850000

出　　处：《中国CT和MRI杂志》2024年第11期31-33,共3页Chinese Journal of CT and MRI

基　　金：西藏自治区自然科学基金组团式援藏医学项目[XZ2021ZR-ZY08(Z)]。

摘　　要：目的探讨多模型迭代重建算法(ASIR-Ⅴ)在高原地区低剂量头颈CTA检查中的应用价值。方法临床需行头颈CTA的60例患者分为两组,各组30例,分别为100KV组(A组)和80KV组(B组),A组数据进行ASIR-Ⅴ40%进行重建,B组分别采用ASIR-Ⅴ40%和80%进行重建,分别为B1组和B2组,比较两组的辐射剂量,各组图像质量进行主观及客观评分,并进行统计分析。结果A组的有效剂量为:(3.06±0.42)mSv,B组有效剂量为(1.57±0.29)mSv,两组比较差异有统计学意义(P<0.05)。B1组及B2组颈动脉及大脑中动脉CT值高于A组,各组比较差异有统计学意义(P<0.05),B1组和B2组图像噪声大于A组,各组比较差异有统计学意义(P<0.05)。各组图像信噪比及对比噪声比比较差异无统计学意义(P>0.05)。各组轴位图像及VR图像主观评价差异无统计学意义(P>0.05)。结论ASIR-Ⅴ重建算法联合低剂量能保证图像质量前提下能有效降低高原地区头颈CTA辐射剂量。Objective To explore the application value of multi-model iterative reconstruction algorithm(ASIR-V)in low dose head and neck CTA examination in plateau area.Methods The 60 patients who need to undergo head and neck CTA in clinical practice were divided into two groups,with 30 patients in each group,namely the 100KV group(Group A)and the 80KV group(Group B).The data of group A were reconstructed by ASIR-Ⅴ40%,and those of group B were reconstructed by ASIR-Ⅴ40%and 80%,respectively,named as group B1 and B2.The radiation doses of the two groups were compared,and the subjective and objective image quality of each group was evaluated and statistically analyzed.Results The effective dose of Group A was(3.06±0.42)mSv,while the effective dose of Group B was(1.57±0.29)mSv,the difference between the two groups was statistically significant(P<0.05).The CT values of the carotid and middle cerebral arteries in groups B1 and B2 were higher than those in group A,and the differences between the groups were statistically significant(P<0.05).The image noise in groups B1 and B2 was greater than that in group A,and the differences between the groups were statistically significant(P<0.05).There was no statistically significant difference in the signal-to-noise ratio and contrast-to-noise ratio of each group's images(P>0.05).There was no statistically significant difference in subjective evaluation between axial and VR images(P>0.05).Conclusion The combination of ASIR-V reconstruction algorithm and low dose can effectively reduce the CTA radiation dose of head and neck in plateau area under the premise of ensuring the image quality.

关 键 词：迭代算法 血管成像 低剂量 多层螺旋CT 

分 类 号：R322.12[医药卫生—人体解剖和组织胚胎学]