Comparative study of breast magnetic resonance T2WI sequence image quality based on two Dixon techniques
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.
breast related diseasesfat suppressionmotion artifactimage qualitywater-fat separation technologyT2-weighted imagingmagnetic resonance imaging
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