简介：摘要磁共振血管成像（3D-TOF-MRA）是一种全新的无损伤性血管成像方法，具有无创伤和无放射性损害、经济快捷、适应症广、大部分病例不用造影剂即可明确诊断等优点广泛应用于临床。本文对532例3D-TOF-MRA检查进行分析，结果197例显示正常占37%，颅内动脉硬化217例占40%，颅内动脉狭窄(或闭塞)168例，占31%，颅内动脉静脉畸形7例占1%，动脉瘤17例占3%，发育异常9例，约1%。结论3D-TOF-MRA的临床应用价值已经得到广泛的肯定，是脑血管疾病的主要检查方法。

简介：HighresolutionmassspectrometryincombinationwithdistillationandSARAfractionationprovidesusanopportunityforin-depthunderstandingaboutthehydrotreatingprocessatthemolecularlevel.Inthisstudy,theatmosphericresiduederivedfromArabianheavycrudeanditshydrotreatedproductswereinitiallysubjectedtodistillationandSARAfractionation.ThesaturateswerecharacterizedbyGCFI/FDTOFMS.ThearomaticsandresinswerecharacterizedbyAPPIFT-ICRMS.Compositionalchangesofdifferentcompounds(paraffins,naphthenes,aromatichydrocarbons,andheteroatomiccompounds)containedindifferentdistillates(vacuumgasoil,vacuumresidue)wereobtained.Moredetailedknowledgeaboutthehydrotreatingprocesswasachieved.