并行采集技术在头颅磁共振中产生伪影的原因及处理方法研究  

Research on the causes and processing methods of artifacts generated by parallel acquisition technology in cranial magnetic resonance imaging

作　　者：李俊华 LI Jun-hua(Jinan Third People's Hospital,Jinan 250132,China)

机构地区：[1]济南市第三人民医院,250132

出　　处：《中国现代药物应用》2024年第18期57-59,共3页Chinese Journal of Modern Drug Application

摘　　要：目的 探讨并行采集技术在头颅磁共振中产生伪影的原因,并分析合理处理方法。方法 选取行头颅磁共振检查的60例患者为研究对象,采用随机数字表法分为甲组、乙组与丙组,各20例。甲组以常规参数开展头颅磁共振扫描;乙组扫描时将激励次数降低为1.5,其他参数不变;丙组扫描时将激励次数降低为1,并将并行采集选项删除。比较三组头颅磁共振扫描的图像质量及伪影发生情况。结果 三组图像质量的主观评估结果比较,差异有统计学意义(P<0.05)。三组图像质量的客观评估结果比较,差异无统计学意义(P>0.05)。甲组发生伪影4例(20.00%),无伪影16例(80.00%);乙组发生伪影2例(10.00%),无伪影18例(90.00%);丙组发生伪影0例,无伪影20例(100.00%)。三组图像的伪影发生率比较,差异有统计学意义(P<0.05)。结论 头颅磁共振检查中出现的以高信号弧形为特点的伪影由并行采集技术所导致,在参数设置时降低激励次数或删除并行采集技术可减少伪影的发生。Objective To explore the causes of artifacts generated by parallel acquisition technology in cranial magnetic resonance imaging and analyze reasonable processing methods.Methods 60 patients who underwent cranial magnetic resonance imaging were selected as the study subjects and divided into group A,group B,and group C according to random numerical table,with 20 patients in each group.Group A was conducted cranial magnetic resonance imaging with conventional parameters.Group B scanned with the number of excitations reduced to 1.5,while other parameters remain unchanged.Group C scanned with the number of excitations reduced to 1 and removed the parallel acquisition option.The image quality and artifact occurrence of cranial magnetic resonance scanning of the three groups were compared.Results Comparison of the subjective assessment results of image quality in the three groups,the difference was statistically significant(P<0.05).Comparison of the results of objective assessment of image quality in the three groups showed no statistically significant difference(P>0.05).In group A,4 cases(20.00%)with artifacts and 16 cases(80.00%)without artifacts.In group B,2 cases(10.00%)with artifacts and 18 cases(90.00%)without artifacts.In group C,0 cases with artifacts and 20 cases(100.00%)without artifacts.There was statistical significance in the incidence of artifacts among the three groups(P<0.05).Conclusion The artifacts characterized by high signal arc in cranial magnetic resonance imaging are caused by parallel acquisition technology.Reducing the number of excitations,or deleting parallel acquisition technology during parameter setting can reduce the occurrence of artifacts.

关 键 词：磁共振 头颅 伪影 并行采集技术 

分 类 号：R445.2[医药卫生—影像医学与核医学]