| 沙松霖,刘奇,白彦灵,马金,张红霞,孙云凤,卢建杰.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[J].中国医学影像技术,2025,41(1):138~141 |
| 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 |
| 投稿时间：2024-06-18 修订日期：2025-01-01 |
| DOI：10.13929/j.issn.1003-3289.2025.01.029 |
| 中文关键词: 体模,成像 信噪比 相控阵线圈 质量控制 磁共振成像 |
| 英文关键词:phantoms, imaging signal-to-noise ratio phased array coils quality control magnetic resonance imaging |
| 基金项目:国家自然科学基金(12375341)。 |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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, 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. |
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