摘要
目的 对比分析乳腺MRI T2WI序列中双回波快速水脂分离(Fast Dixon)技术与传统两点法水脂分离(Dixon)技术图像质量,探讨两种Dixon技术的临床应用价值。材料与方法 回顾性分析2022年6月至2023年3月广西壮族自治区人民医院同时行Fast Dixon(Fast Dixon组)与两点Dixon(两点Dixon组)两种脂肪抑制T2WI序列的41例乳腺MRI检查女性患者病例。综合分析两组图像的质量(包括总体图像质量、脂肪抑制质量、纤维腺体组织与实性病灶的清晰度及在腋窝、胸壁、皮肤区域的运动伪影大小);计算病灶、腋窝、胸肌、正常实质的信噪比(signal-to-noise ratio,SNR)及病灶实质对比噪声比(contrast-to-noise ratio,CNR)。采用Kendall’s W系数评估观察者间主观评分数据的一致性,采用组内相关系数(intra-class correlation coefficient,ICC)评价观察者间图像质量客观定量评价参数的一致性。计数资料用非参数检验进行比较,计量资料采用配对t检验或Wilcoxon符号秩检验。P<0.05为差异有统计学意义。结果 主观评价:两名医师主观评分一致性较好或极好(Kendall’s W=0.773~0.928,P<0.001);两种Dixon技术均可获得均匀一致的脂肪抑制图像质量(P>0.05);Fast Dixon组在腋窝、胸壁、皮肤区域运动伪影更小,总体图像质量较两点Dixon组好,差异有统计学意义(P<0.05);两组图像纤维腺体组织及病灶的清晰度差异无统计学意义(P>0.05)。客观评价:两名观察者观测值计算所得SNR和CNR具有极好的一致性(ICC=0.897~0.936,P<0.001);Fast Dixon组在病灶、正常实质、胸肌及腋窝的SNR优于两点Dixon组(P<0.05);两组病灶的CNR差异无统计学意义(P>0.05)。结论 与两点Dixon技术相比,Fast Dixon技术既可获得均匀一致的脂肪抑制图像,同时运动伪影较少,显著改善乳腺周围区域的图像质量,提升乳腺MRI T2WI序列总体图像质量。
Objective:To compare and analyze the image quality of breast MRI T2WI sequences between double-echo Fast water-fat separation(Dixon)technique and traditional two-point Dixon technique,and to explore the clinical application value of the two Dixon techniques.Materials and Methods:A retrospective study was conducted on 41 female patients who underwent Fast Dixon(Fast Dixon group)and two-point Dixon(two-point Dixon group)two fat-suppressed T2WI sequences for MRI breast examination in Guangxi Zhuang Autonomous Region People's Hospital from June 2022 to March 2023.The image quality of the two groups was comprehensively analyzed(including overall image quality,fat-suppressed quality,motion artifact size in axilla,chest wall,skin area,and clarity of fibroglandular tissue and solid lesions).The signal-to-noise ratio(SNR)of lesions,axilla,chest wall,normal parenchyma,and the contrast-to-noise ratio(CNR)of lesion parenchyma were calculated.Kendall's W coefficient was used to evaluate the consistency of subjective score data between observers,and the intra-class correlation coefficient(ICC)was used to evaluate the consistency of objective quantitative evaluation parameters of image quality between observers.Count data were compared by nonparametric test,and measurement data were compared by paired t test or Wilcoxon signed rank test.P<0.05 was considered statistically significant.Results:Subjective evaluation:the subjective scores of the two physicians showed good or excellent consistency(Kendall's W=0.773-0.928,P<0.001).Both Dixon techniques can achieve uniform fat inhibition image quality(P>0.05).Fast Dixon group had smaller motion artifacts in axilla,chest wall and skin area,and the overall image quality was better than that of two-point Dixon group,with statistical significance(P<0.05).There was no statistical significance in the definition of fibroglandular tissue and lesions between the two groups(P>0.05).Objective evaluation:The SNR and CNR calculated by two observers showed very good consistency(ICC=0.897-0.936,P<0.001).The SNR of the Fast Dixon group was better than that of the two-point Dixon group in the lesions,normal parenchyma,pectoral muscle and axilla(P<0.05),and there was no significant difference in the CNR of the lesions between the two groups.Conclusions:Compared with two-point Dixon technique,Fast Dixon technique can achieve uniform and consistent fat-suppressed images and reduce motion artifacts in the image quality of the peri-mammary region,thereby significantly improving the overall image quality of the breast MRI T2WI sequence.
作者
蒋平平
陈燕清
黄涛
官晓晖
陆虹宇
邓德茂
JIANG Pingping;CHEN Yanqing;HUANG Tao;GUAN Xiaohui;LU Hongyu;DENG Demao(Department of Radiology,the People's Hospital of Guangxi Zhuang Autonomous Region,Nanning 530021,China)
出处
《磁共振成像》
CAS
CSCD
北大核心
2024年第3期158-162,共5页
Chinese Journal of Magnetic Resonance Imaging
基金
广西壮族自治区卫生健康委员会自筹经费科研课题项目(编号:Z20210688)。
关键词
乳腺相关疾病
脂肪抑制
运动伪影
图像质量
水脂分离技术
T2加权成像
磁共振成像
breast related diseases
fat suppression
motion artifact
image quality
water-fat separation technology
T2-weighted imaging
magnetic resonance imaging
