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
10.13929/j.issn.1003-3289.2025.01.029
- VernacularTitle: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
- Author:
Songlin SHA
1
;
Qi LIU
;
Yanling BAI
;
Jin MA
;
Hongxia ZHANG
;
Yunfeng SUN
;
Jianjie LU
Author Information
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
- Publication Type:Journal Article
- Keywords:
phantoms,imaging;
signal-to-noise ratio;
phased array coils;
quality control;
magnetic resonance imaging
- From:
Chinese Journal of Medical Imaging Technology
2025;41(1):138-141
- CountryChina
- Language:Chinese
-
Abstract:
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 T 1W-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,SNRsD 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 SNRRMs was 1.10±0.07,0.58±0.03,1.01±0.13 and 1.31±0.15,respectively.For T2W-SE sequence,SNRsD was 1.40±0.08,0.48±0.02,1.04±0.07 and 1.08±0.06,respectively,while SNRRMs was 1.29±0.09,0.53±0.03,0.84±0.08 and 1.35±0.12,respectively.Compared pairwise,significant difference of SNRsD was found in 9 pairs(all P＜0.05),while of SNRRMs 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.
