正常肾脏在不同场强下体素不相干运动MRI研究
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摘要
目的:探讨不同场强条件对健康成人肾脏体素不相干运动(IVIM)DWI定量参数值的影响。方法:30例健康志愿者在24h内分别在1.5T和3.0T MR扫描仪上进行扫描序列和参数完全相同的IVIM-DWI扫描,比较不同场强下肾实质的灌注参数(D、D*和f)值的差异。结果:3.0T场强条件下左、右侧肾实质的D值均大于1.5T、D*值均小于1.5T,差异均有统计学意义(P<0.05);两种场强条件下f值的差异无统计学意义(P>0.05)。在相同场强条件下,1.5T时左肾实质的D值大于右肾(P<0.05);而3.0T时双肾实质D值的差异无统计学意义(P>0.05);1.5T时不同性别组间双肾的D、D*和f值的差异均无统计学意义(P>0.05),而3.0T时男性组双肾的f值大于女性组(P<0.05)。结论:肾脏IVIM-DWI定量参数值的测量受到场强变化的影响,其可靠性和可行性需建立在相同场强及扫描参数统一的基础上。
Objective:To compare the D,D*and f values of healthy kidneys in different field strengths and investigate whether an IVIM-DWI conclusion was applicable to different field strengths.Methods:30healthy volunteers underwent kidney IVIM-DWI twice using the same scan sequences and parameters at 1.5Tand 3.0T MR scanners within 24 hours.The differences of D,D*,and f values were compared.Results:The D values of the left and right renal parenchyma at the 3.0T MR scanner were significantly greater than those at the 1.5T MR scanner(P<0.05),D*values were less than those at 1.5T MR scanner(P<0.05),while The f values had no significant difference between them(P>0.05).Under 1.5Tfield strength,D value of left renal parenchyma was higher than that of right kidney with statistically significant difference,while the D value of left and right renal parenchyma has no difference at 3.0T MR scanner.The D,D*and f values in male and female groups were not significantly different(P>0.05)at 1.5T MR scanner,while f value in male group was higher than that in female group at 3.0T MR scanner(P<0.05).Conclusion:The quantitative parameter values of kidney IVIM-DWI were affected by different field strengths.Their reliability and feasibility should be based on the same field strength and scan parameters.
Objective:To compare the D,D*and f values of healthy kidneys in different field strengths and investigate whether an IVIM-DWI conclusion was applicable to different field strengths.Methods:30healthy volunteers underwent kidney IVIM-DWI twice using the same scan sequences and parameters at 1.5Tand 3.0T MR scanners within 24 hours.The differences of D,D*,and f values were compared.Results:The D values of the left and right renal parenchyma at the 3.0T MR scanner were significantly greater than those at the 1.5T MR scanner(P<0.05),D*values were less than those at 1.5T MR scanner(P<0.05),while The f values had no significant difference between them(P>0.05).Under 1.5Tfield strength,D value of left renal parenchyma was higher than that of right kidney with statistically significant difference,while the D value of left and right renal parenchyma has no difference at 3.0T MR scanner.The D,D*and f values in male and female groups were not significantly different(P>0.05)at 1.5T MR scanner,while f value in male group was higher than that in female group at 3.0T MR scanner(P<0.05).Conclusion:The quantitative parameter values of kidney IVIM-DWI were affected by different field strengths.Their reliability and feasibility should be based on the same field strength and scan parameters.
引文
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[2] Kataoka M,Kido A,Yamamoto A,et al.Diffusion tensor imaging of kidneys with respiratory triggering:optimization of parameters to demonstrate anisotropic structures on fraction anisotropy maps[J].J Magn Reson Imaging,2009,29(3):736-744.
[3]米瑞,夏军,胡若凡,等.健康成人肾脏磁共振体素内不相干运动及扩散张量成像的参数分析[J].影像诊断与介入放射学,2017,26(2):146-151.
[4] Le Bihan D,Breton E,Lallemand D,et al.MR imaging of intravoxel incoherent motions:application to diffusion and perfusion in neurologic disorders[J].Radiology,1986,161(2):401-407.
[5] Zhang JL,Sigmund EE,Chandarana H,et al.Variability of renal apparent diffusion coefficients:limitations of the monoexponential model for diffusion quantification[J].Radiology,2010,254(3):783-792.
[6]刘林栋,毛存南,吴书铭,等.3.0T磁共振仪的日常使用[J].中国医疗设备,2013,28(12):132-135.
[7]倪萍,陈自谦,张鲁闽,等.3T磁共振的特点及其质量控制策略[J].中国医疗设备,2009,24(12):121-124.
[8] Saremi F,Jalili M,Sefidbakht S,et al.Diffusion-weighted imaging of the abdomen at 3T:image quality comparison with 1.5T magnet using 3different imaging sequences[J].J Comput Assist Tomogr,2011,35(3):317-325.
[9]钟志伟,陈娇香,邹乔,等.肠道准备对改善兔肾IVIM的磁共振扩散加权成像图像磁敏感伪影的研究[J].实用医学影像杂志,2016,17(6):461-463.
[10]邹倩,罗城,龚良庚.基于体素内不相干运动的扩散加权成像在肾脏疾病中的应用进展[J].中华放射学杂志,2016,50(3):235-237.
[11]丁玉芹,缪熙音,李轫晨,等.成人正常肾脏体素内不相干运动扩散加权成像[J].实用放射学杂志,2016,32(4):558-561.
[12] Cui Y,Dyvorne H,Besa C,et al.IVIM Diffusion-weighted Imaging of the Liver at 3.0T:comparison with 1.5T[J/OL].Eur J Radiol Open,2015,2:e123-e128.DOI:10.1016/j.ejro.2015.08.001
[13]马晓晖,张伟,刘栋,等.1.5T与3.0T MRI弥散加权成像对腰椎间盘退变诊断价值的比较[J].河北医药,2015,37(7):981-984.
[14] Bane O,Wagner M,Zhang JL,et al.Assessment of renal function using intravoxel incoherent motion diffusion-weighted imaging and dynamic contrast-enhanced MRI[J].J Magn Reson Imaging,2016,44(2):317-326.
[15]曲丽洁,周建军,丁玉芹,等.磁共振体素内不相干运动成像和扩散峰度成像在正常肾脏成像中的初步研究[J].放射学实践,2016,30(10):908-913.
[16] Sigmund EE,Vivier PH,Sui D,et al.Intravoxel incoherent motion and diffusion-tensor imaging in renal tissue under hydration and furosemide flow challenges[J].Radiology,2012,263(3):758-769.
[17]Wittsack HJ,Lanzman RS,Quentin M,et al.Temporally resolved electrocardiogram-triggered diffusion-weighted imaging of the human kidney:correlation between intravoxel incoherent motion parameters and renal blood flow at different time points of the cardiac cycle[J].Invest Radiol,2012,47(4):226-230.