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- Keywords active shimming;shim coils;magnetic field homogeneity;FID; 有源匀场;匀场线圈;磁场均匀度;FID;
- The active shim coils of MRI system are mainly used to correct the unhomogeneity of magnetic field in real time. 磁共振成像系统中的有源匀场线圈主要用来对磁场的非均匀性进行实时校正,因此需要在短时间内算出匀场电流。
- In the end, a group of spin echo images(T1 weighted and T2 weighted) produced by the 0.2T MRI are given to demonstrate the satisfactory shimming performance of this active shimming system. 2T开放式永磁型医用核磁共振成像仪所研制的有源匀场系统的基本结构、工作原理和匀场方法,并在最后给出了该MRI通过自旋回波成像方式产生的一组影像(T1加权和T2加权)以展示该系统良好的匀场性能。
- Keywords MRI;magnet system;permanent magnet;passive shimming;active shimming;shim coils;FEA;magnetic induction intensity;magnetic field homogeneity; 磁共振成像;磁体系统;永磁体;无源匀场;有源匀场;匀场线圈;有限元分析;磁感应强度;磁场均匀度;
- Keywords Active carbon;Freon;Recovery; 活性炭;氟里昂;回收;
- Keywords active clay;heavy metal ions;adsorb; 活性白土;重金属离子;吸附性能;
- Keywords active element;soakage;diamond;reaction energy;bond; 活性元素;润湿;金刚石;反应能;粘结剂;
- Keywords Active nickel sulfide;Decoppering;Reaction mechanism; 活性硫化镍;除铜;反应机理;
- Keywords Active dye;Catalytic oxidation;Photodecomposition; 活性染料;催化氧化;光降解;
- Keywords active carbon phenylacetaldehyde isomerization; 活性炭;苯乙醛;异构化;
- Keywords active metal;reduction;carbonyl compound;halohydrocarbon; 活性金属;还原;羰基化合物;卤代烃;
- Keywords active carbon;L-Phenylalanine;L-Tyrosine;adsorption;elute; 活性炭;L-苯丙氨酸;L-酪氨酸;吸附;解吸;
- Keywords Active placentin from lamb placenta;Immunity;Application; 活化羊胎素;免疫功能;应用开发;
- active shimming 主动匀场
- Keywords active muds;micro-animal;indicative living things; 活性污泥;微型动物;指示生物;
- Keywords active sludge;phenol wastewater;cultivate and acclimatize; 活性污泥;苯酚废水;培养驯化;
- Keywords active distribution;ethylene oxid ation;selectivity; 活性分布;环氧乙烷;选择性;
- Keywords activated silicic acid;flocculant; 活性硅酸;絮凝剂;
- Keywords activated carbon;adsorption;chlorophenol; 活性炭;吸附;氯酚;
- Keywords active carbon fiber;HNO 3 dipping;NO removal;TPD; 活性炭纤维;硝酸浸渍;NO的脱除;程序升温脱附;
