基于标准差法与均方根法测算美国放射学会体模相控阵线圈MRI信噪比  

Standard deviation method and root mean square method for measuring signal-to-noise ratio of MRI of American College of Radiology phantom based on phased array coils

作　　者：沙松霖 刘奇 白彦灵[1] 马金 张红霞[3] 孙云凤[3] 卢建杰 SHA Songlin;LIU Qi;BAI Yanling;MA Jin;ZHANG Hongxia;SUN Yunfeng;LU Jianjie(Department of Radiation Physics,Harbin Medical University Cancer Hospital,Harbin 150081,China;Department of Services and Solutions Implementation,Philips Investment Corporation Limited Beijing Branch,Beijing 100020,China;Medical Imaging Centre,Harbin Medical University Cancer Hospital,Harbin 150081,China)

机构地区：[1]哈尔滨医科大学附属肿瘤医院放射物理科,黑龙江哈尔滨150081 [2]飞利浦(中国)投资有限公司北京分公司服务与解决方案实施部,北京100020 [3]哈尔滨医科大学附属肿瘤医院医学影像中心,黑龙江哈尔滨150081

出　　处：《中国医学影像技术》2025年第1期138-141,共4页Chinese Journal of Medical Imaging Technology

基　　金：国家自然科学基金(12375341)。

摘　　要：目的比较标准差法与均方根法用于测算美国放射学会(ACR)体模相控阵线圈MRI信噪比(SNR)的价值。方法分别以头部线圈(Head)、腹部线圈(Anterior)、双片柔线圈(Flex L)及腹部线圈+柔线圈(Anterior+Flex L)对ACR体模进行6次重复扫描,序列包括轴位T1W-自旋回波(SE)和T2W-SE;根据所用线圈及扫描序列分为8组扫描方案。分别以标准差法与均方根法测算8组图像SNR,观察2种方法的差异。结果T1W-SE序列下,基于Head、Anterior、Flex L及Anterior+Flex L线圈MRI的SNR标准差法分别为1.25±0.07、0.56±0.02、1.15±0.10及1.04±0.11,SNR均方根法分别为1.10±0.07、0.58±0.03、1.01±0.13及1.31±0.15;T2W-SE序列的SNR标准差法分别为1.40±0.08、0.48±0.02、1.04±0.07及1.08±0.06,SNR均方根法分别为1.29±0.09、0.53±0.03、0.84±0.08及1.35±0.12。两两比较,9对SNR标准差法差异存在统计学意义(P均<0.05)、10对SNR均方根法差异存在统计学意义(P均<0.05)。结论相比标准差法,均方根法更适用于测算ACR体模相控阵线圈MRI的SNR。Objective To compare the value of standard deviation(SD)method and root mean square(RMS)method for measuring signal-to-noise ratio(SNR)of MRI of American College of Radiology(ACR)phantom based on phased array coils.Methods ACR phantom was scanned with head coil(Head),abdominal coil(Anterior),dual piece flexible coil(Flex L)and abdominal coil+flexible coil(Anterior+Flex L)each for 6 times,respectively,with sequences of axial T1W-spin echo(SE)and T2W-SE.And the scanning schemes were divided into 8 groups based on 4 types of coils and 2 sequences.SNR of 8 groups were measured with standard deviation method and root mean square method,respectively,and the differences between the above 2 methods were observed.Results For T1W-SE sequence,SNR SD of MRI based on Head,Anterior,Flex L and Anterior+Flex L was 1.25±0.07,0.56±0.02,1.15±0.10 and 1.04±0.11,respectively,while SNR RMS was 1.10±0.07,0.58±0.03,1.01±0.13 and 1.31±0.15,respectively.For T2W-SE sequence,SNR SD was 1.40±0.08,0.48±0.02,1.04±0.07 and 1.08±0.06,respectively,while SNR RMS was 1.29±0.09,0.53±0.03,0.84±0.08 and 1.35±0.12,respectively.Compared pairwise,significant difference of SNR SD was found in 9 pairs(all P<0.05),while of SNR RMS was detected in 10 pairs(all P<0.05).Conclusion Compared with standard deviation method,root mean square method was more suitable for measuring SNR of MRI of ACR phantom based on phased array coils.

关 键 词：体模 成像 信噪比 相控阵线圈 质量控制 磁共振成像 

分 类 号：R445.2[医药卫生—影像医学与核医学]