目的研究体素内不相干运动DWI(IVIMDWI)联合动态增强MRI(DCE-MRI)定量参数在克罗恩病(CD)活动性评估中的价值,并与基于磁共振肠造影(MRE)的活动性分级比较,讨论两者鉴别CD活动性的效能差异。方法回顾性收集CD患者96例,所有患者均接受常...目的研究体素内不相干运动DWI(IVIMDWI)联合动态增强MRI(DCE-MRI)定量参数在克罗恩病(CD)活动性评估中的价值,并与基于磁共振肠造影(MRE)的活动性分级比较,讨论两者鉴别CD活动性的效能差异。方法回顾性收集CD患者96例,所有患者均接受常规MRE、IVIM-DWI和DCE-MRI扫描。于病变最显著区测量功能MRI定量参数;依据临床活动性评分(HBI)分为缓解组、轻中度活动组和重度活动组,比较MRE活动性分级及功能MRI定量参数的组间差异,对组间具有统计学意义的IVIM-DWI和DCE-MRI定量参数进一步行多元有序Logistic回归分析,采用ROC曲线比较MRE活动性分级和功能MRI定量参数鉴别CD活动性的诊断效能。结果随病情加重,MRE活动性分级提高(P<0.001);ADC_(fast)升高(P<0.001),Fraction of ADC_(fast)降低(P=0.001);K^(trans)和K_(ep)升高(P<0.001、P=0.005)。有序Logistic回归显示K^(trans)和ADC_(fast)是鉴别CD活动性的独立预测因子。ROC曲线分析显示功能MRI组合定量参数(K^(trans)+ADC_(fast))(AUC=0.871)鉴别缓解组和活动组的诊断效能优于MRE活动性分级(AUC=0.744)(P=0.027)。结论功能MRI模型在鉴别CD活动性方面比MRE活动性分级具有更好的诊断效能。展开更多
Optical coherence tomography angiography(OCTA)takes the flowing red blood cells(RBCs)as intrinsic contrast agents,enabling fast and three-dimensional visualization of vasculature per-fusion down to capillary level,wit...Optical coherence tomography angiography(OCTA)takes the flowing red blood cells(RBCs)as intrinsic contrast agents,enabling fast and three-dimensional visualization of vasculature per-fusion down to capillary level,without a requirement of exogenous fluorescent injection.Various motion-contrast OCTA algorithms have been proposed to effectively extract dynamic blood flow from static tissues utilizing the different components of OCT signals(including amplitude,phase and complex)with various operations(such as differential,variance and decorrelation).Those algorithms promote the application of OCTA in both clinical diagnosis and scientific research.The purpose of this paper is to provide a systematical review of OCTA based on the inverse SNR and decorrelation features(ID-OCTA),mainly including the OCTA contrast origins,ID-OCTA imaging,quantification and applications.展开更多
文摘目的研究体素内不相干运动DWI(IVIMDWI)联合动态增强MRI(DCE-MRI)定量参数在克罗恩病(CD)活动性评估中的价值,并与基于磁共振肠造影(MRE)的活动性分级比较,讨论两者鉴别CD活动性的效能差异。方法回顾性收集CD患者96例,所有患者均接受常规MRE、IVIM-DWI和DCE-MRI扫描。于病变最显著区测量功能MRI定量参数;依据临床活动性评分(HBI)分为缓解组、轻中度活动组和重度活动组,比较MRE活动性分级及功能MRI定量参数的组间差异,对组间具有统计学意义的IVIM-DWI和DCE-MRI定量参数进一步行多元有序Logistic回归分析,采用ROC曲线比较MRE活动性分级和功能MRI定量参数鉴别CD活动性的诊断效能。结果随病情加重,MRE活动性分级提高(P<0.001);ADC_(fast)升高(P<0.001),Fraction of ADC_(fast)降低(P=0.001);K^(trans)和K_(ep)升高(P<0.001、P=0.005)。有序Logistic回归显示K^(trans)和ADC_(fast)是鉴别CD活动性的独立预测因子。ROC曲线分析显示功能MRI组合定量参数(K^(trans)+ADC_(fast))(AUC=0.871)鉴别缓解组和活动组的诊断效能优于MRE活动性分级(AUC=0.744)(P=0.027)。结论功能MRI模型在鉴别CD活动性方面比MRE活动性分级具有更好的诊断效能。
基金The authors are thankful to National Natural Science Foundation of China(62075189)Zhejiang Provincial Natural Science Foundation of China(LR19F050002)+1 种基金Zhejiang Lab(2018EBOZX01)Fundamental Research Funds for the Central Universities(2018FZA5003).
文摘Optical coherence tomography angiography(OCTA)takes the flowing red blood cells(RBCs)as intrinsic contrast agents,enabling fast and three-dimensional visualization of vasculature per-fusion down to capillary level,without a requirement of exogenous fluorescent injection.Various motion-contrast OCTA algorithms have been proposed to effectively extract dynamic blood flow from static tissues utilizing the different components of OCT signals(including amplitude,phase and complex)with various operations(such as differential,variance and decorrelation).Those algorithms promote the application of OCTA in both clinical diagnosis and scientific research.The purpose of this paper is to provide a systematical review of OCTA based on the inverse SNR and decorrelation features(ID-OCTA),mainly including the OCTA contrast origins,ID-OCTA imaging,quantification and applications.