静音技术在颅脑磁共振成像中的初步应用  

Preliminary Application of Silent Technique in Craniocerebral Magnetic Resonance Imaging

作　　者：黄侃[1] 宋清伟[1] 刘爱连[1] 王楠[1] 陈丽华[1] 张浩南 HUANG Kan;SONG Qinwei;LIU Ailian;WANG Nan;CHEN Lihua;ZHANG Haonan(Department of Radiology,First Affiliated Hospital of Dalian Medical University,Dalian 116011,China)

机构地区：[1]大连医科大学附属第一医院放射科,辽宁省大连市116011

出　　处：《中国医学计算机成像杂志》2024年第3期387-391,共5页Chinese Computed Medical Imaging

摘　　要：目的:探讨静音技术不同静音因子(QF)对颅脑MRI图像质量的影响。方法:招募50名志愿者[男23例,女27例,平均年龄(58.06±16.77)岁],以3.0 T MR扫描仪结合静音技术(QF分别为1、0.8、0.6、0.4、0.2)行颅脑矢状位T1液体抑制反转恢复(FLAIR)、T2WI、T2 FLAIR序列扫描,各序列受检者均为21例。扫描过程中记录各序列噪声最大值。在胼胝体、脑白质、小脑、脑桥划定感兴趣区测量信号值和噪声强度,计算信噪比(SNR)和对比度噪声比(CNR)。采用四分法对图像质量进行评分。采用Kappa检验评估两观察者主观评分的一致性。对各序列不同QF组间图像的SNR、CNR和主观评分差异采用单因素方差分析。结果:两观察者主观评分一致性良好(Kappa值=0.806~0.871)。T1 FLAIR序列胼胝体SNR、CNR、主观评分,T2 FLAIR序列胼胝体和小脑CNR,T2WI序列胼胝体CNR和主观评分,在不同QF时的差异有统计学意义(P<0.001)。两两比较结果:QF为0.4或0.2时,T1 FLAIR主观评分较QF为1.0时差异有统计学意义(P<0.05);QF为0.2时,T2 FLAIR胼胝体SNR、T2WI主观评分较QF为1.0时差异有统计学意义(P<0.05)。结论:基于静音技术的颅脑MR扫描时间随着QF的减小,噪声值逐渐降低,综合考虑噪声值与图像质量,临床推荐QF分别为0.6、0.4、0.2时行颅脑轴位T1 FLAIR、T2WI、T2 FLAIR序列扫描。Purpose:To explore the effect of different quiet factors(QF)on the image quality of craniocerebral MRI.Methods:Fifty volunteers[23 males,27 females,age(58.06±16.77)years]were recruited in the study.3.0 T MR scanner and mute technique(QF=1,0.8,0.6,0.4,0.2)were used to scan the sagittal T1 fluid suppressed inversion recovery(FLAIR),T2WI,and T2 FLAIR sequences.The maximum noise of each sequence was recorded during the scanning process.The signal and noise intensity were measured in the corpus callosum,white matter,cerebellum and pons,and the signal-to-noise ratio(SNR)and contrast-to-noise ratio(CNR)were calculated.The image quality was scored using a four-point scale.Kappa test was used to evaluate the consistency of subjective scores between the two observers.One-way ANOVA was used to analyze differences in SNR,CNR and subjective scores of the images between different QF groups in each sequence.Results:The subjective scores of the two observers were consistent(Kappa=0.806-0.871).There were statistically significant differences in SNR,CNR,and subjective scores at the corpus callosum in T1 FLAIR,CNR at the corpus callosum and cerebellum in T2 FLAIR,and CNR and subjective scores at the corpus callosum in T2WI between different QF groups(P<0.001).The subjective scores in T1 FLAIR with QF of 0.4 or 0.2 were significantly higher than that with QF of 1.0(P<0.05),and the SNR at corpus callosum in T2 FLAIR and subjective scores in T2WI with QF of 0.2 were significantly higher than that with QF of 1.0(P<0.05).Conclusion:The time of brain MR scanning based on mute technique decreases with the decrease of QF,and the noise value decreases gradually.Considering the noise value and image quality,it is recommended to scan brain axial T1 FLAIR,T2WI and T2 FLAIR sequences when QF is 0.6,0.4,0.2,respectively.

关 键 词：颅脑 磁共振成像 静音 噪声 

分 类 号：R814.42[医药卫生—影像医学与核医学]