目的研究磁共振双回波稳态(DESS)及T2-mapping序列在髋关节撞击综合征(FAI)关节软骨退变早期的价值。方法选取经过临床确诊的30例早期髋关节撞击综合征患者分别行FS-T2WI、DESS、T2-mapping检查。结果 DESS发现FAI软骨损伤的阳性率显著...目的研究磁共振双回波稳态(DESS)及T2-mapping序列在髋关节撞击综合征(FAI)关节软骨退变早期的价值。方法选取经过临床确诊的30例早期髋关节撞击综合征患者分别行FS-T2WI、DESS、T2-mapping检查。结果 DESS发现FAI软骨损伤的阳性率显著高于FS-T2WI(10/30 vs 3/30,χ2=4.812,P=0.028),T2-mapping发现FAI软骨损伤的阳性率也显著高于FS-T2WI(11/30 vs 3/30,χ2=5.963,P=0.015),DESS和T2-mapping发现FAI软骨损伤的阳性率差异无统计学意义(χ2=0.073,P=0.787)。结论 DESS序列显示髋关节软骨退变敏感度较高,T2-mapping序列成像对FAI关节软骨早期退变进行直观的定量评估,可以发现软骨早期病变,从而能为临床治疗FAI方案提供重要参考依据。展开更多
目的探讨T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨损伤中的诊断价值。方法对26例关节软骨损伤患者行T_2 star mapping、T_1 images和3D DESS扫描,并将T_1 images、T_2 star mapping与3D DESS图像融合,评价患者股骨...目的探讨T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨损伤中的诊断价值。方法对26例关节软骨损伤患者行T_2 star mapping、T_1 images和3D DESS扫描,并将T_1 images、T_2 star mapping与3D DESS图像融合,评价患者股骨、胫骨、髌骨关节软骨损伤程度并与关节镜结果对比,计算融合伪彩图诊断软骨损伤的特异性、敏感性及与关节镜诊断结果一致性。结果 T_1 images-3D DESS融合伪彩图诊断关节软骨损伤的敏感度、特异度及Kappa值分别为92.8%、93.0%、0.769,T_2 star mapping-3D DESS融合伪彩图诊断关节软骨损伤的敏感度、特异度及Kappa值分别为91.4%、94.2%、0.787。结论 T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨早期损伤评价上优于关节镜。展开更多
In this review,the recent development about using DESs as green solvents in transition metal catalyzed organic reactions was highlighted.Firstly,the development of DESs was simply introduced.After presenting the advan...In this review,the recent development about using DESs as green solvents in transition metal catalyzed organic reactions was highlighted.Firstly,the development of DESs was simply introduced.After presenting the advantages of DESs,transition metals catalyzed organic reactions using DESs as green solvents were classified and introduced in detail.Different transition metals such as Au,metal impregnated on magnetite,Pd and Ru catalyzed organic reactions proceeded smoothly in DESs and gave corresponding products in good yields.And in some cases,the catalytic systems could be recycled up to several times without any decrease in activity.展开更多
Deep eutectic solvents(DESs)1-butyl-3-methylimidazolium bromide-polyalcohol([Bmim]Br-polyalcohol)were synthesized from[Bmim]Br and polyalcohol such as ethylene glycol(EG),propylene glycol(PG),glycerol(GL)at a molar ra...Deep eutectic solvents(DESs)1-butyl-3-methylimidazolium bromide-polyalcohol([Bmim]Br-polyalcohol)were synthesized from[Bmim]Br and polyalcohol such as ethylene glycol(EG),propylene glycol(PG),glycerol(GL)at a molar ratio of 1:2.[Bmim]Br-2propylene glycol([Bmim]Br-2PG)was characterized with FT-IR spectroscopy and 1H NMR.The removal of benzothiophene(BT)from model oil was investigated by extraction with DES[Bmim]Br-2PG.The results showed that an extraction efficiency as high as 54.1%could be achieved with the solvent in one-stage extraction at 30℃in 30 min with a DES/oil mass ratio of 1:1.Deep desulfurization was realized after five-stage extraction,and sulfur content in model oil was reduced to less than 10μg/g.The used[Bmim]Br-2PG DES was regenerated and showed an extraction efficiency of 50.5%within four recycles.展开更多
文摘目的研究磁共振双回波稳态(DESS)及T2-mapping序列在髋关节撞击综合征(FAI)关节软骨退变早期的价值。方法选取经过临床确诊的30例早期髋关节撞击综合征患者分别行FS-T2WI、DESS、T2-mapping检查。结果 DESS发现FAI软骨损伤的阳性率显著高于FS-T2WI(10/30 vs 3/30,χ2=4.812,P=0.028),T2-mapping发现FAI软骨损伤的阳性率也显著高于FS-T2WI(11/30 vs 3/30,χ2=5.963,P=0.015),DESS和T2-mapping发现FAI软骨损伤的阳性率差异无统计学意义(χ2=0.073,P=0.787)。结论 DESS序列显示髋关节软骨退变敏感度较高,T2-mapping序列成像对FAI关节软骨早期退变进行直观的定量评估,可以发现软骨早期病变,从而能为临床治疗FAI方案提供重要参考依据。
文摘目的探讨T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨损伤中的诊断价值。方法对26例关节软骨损伤患者行T_2 star mapping、T_1 images和3D DESS扫描,并将T_1 images、T_2 star mapping与3D DESS图像融合,评价患者股骨、胫骨、髌骨关节软骨损伤程度并与关节镜结果对比,计算融合伪彩图诊断软骨损伤的特异性、敏感性及与关节镜诊断结果一致性。结果 T_1 images-3D DESS融合伪彩图诊断关节软骨损伤的敏感度、特异度及Kappa值分别为92.8%、93.0%、0.769,T_2 star mapping-3D DESS融合伪彩图诊断关节软骨损伤的敏感度、特异度及Kappa值分别为91.4%、94.2%、0.787。结论 T_2 star mapping、T_1 images与3D DESS融合伪彩图在关节软骨早期损伤评价上优于关节镜。
基金the National Natural Science Foundation of China (Nos.21802040,21877034)the Natural Science Fund Youth Project of Hunan Province (No.2018JJ3145)+1 种基金the General project of Hunan Education Department(No. 17C0629)the Open Foundation of Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education,Hunan University of Science and Technology(No. E21843) for financial support
文摘In this review,the recent development about using DESs as green solvents in transition metal catalyzed organic reactions was highlighted.Firstly,the development of DESs was simply introduced.After presenting the advantages of DESs,transition metals catalyzed organic reactions using DESs as green solvents were classified and introduced in detail.Different transition metals such as Au,metal impregnated on magnetite,Pd and Ru catalyzed organic reactions proceeded smoothly in DESs and gave corresponding products in good yields.And in some cases,the catalytic systems could be recycled up to several times without any decrease in activity.
基金The authors are grateful for financial support from the Doctoral Scientific Research Foundation of Liaoning Shihua University(2019×JJ-006).
文摘Deep eutectic solvents(DESs)1-butyl-3-methylimidazolium bromide-polyalcohol([Bmim]Br-polyalcohol)were synthesized from[Bmim]Br and polyalcohol such as ethylene glycol(EG),propylene glycol(PG),glycerol(GL)at a molar ratio of 1:2.[Bmim]Br-2propylene glycol([Bmim]Br-2PG)was characterized with FT-IR spectroscopy and 1H NMR.The removal of benzothiophene(BT)from model oil was investigated by extraction with DES[Bmim]Br-2PG.The results showed that an extraction efficiency as high as 54.1%could be achieved with the solvent in one-stage extraction at 30℃in 30 min with a DES/oil mass ratio of 1:1.Deep desulfurization was realized after five-stage extraction,and sulfur content in model oil was reduced to less than 10μg/g.The used[Bmim]Br-2PG DES was regenerated and showed an extraction efficiency of 50.5%within four recycles.
