title: [The relevance of ADC value, T₁intensive rate and the clinical activities in ankylosing spondylitis sacroiliitis].
abstract: OBJECTIVE
  To evaluate the value of judging for the activity in AS by diffusion-weighted sequences (DWI) and enhance sequences MRI(DCE-MRI), to explore the correlation of Apparent diffusion coefficient(ADC) values, intensive rate and the clinical activity index in sacroiliitis (SIJ) of ankylosing spondylitis (AS).
  
  
  METHODS
  56 patients prospectively choiced and diagnosed were divided into two groupsas, active group (n = 32) and chronic group (n = 24) by rheumatologist according to BASDAI and laboratory parameters. Twenty healthy adults were as control group. The values of ADC and intensive rate of all sacroiliac joints (SIJs) were measured on MRI. BASDAI score were got by Bath ankylosing spondylitis disease activity index. ESR, CPR and were got by laboratory. Statisticaly to analysis whether the parameters were significantly different amang AS active, chronic, and the control group. To assess the correlation of the values of ADC, intensive rate and BASDAI score, ESR, CPR and in SIJ.
  
  
  RESULTS
  the values of ADC and intensive rate were significantly different among AS active, chronic and the control group. There were the significant correlation between the values of ADC, intensive rate and BASDAI score.
  
  
  CONCLUSIONS
  Diffusion-weighted sequences and Contrast-enhanced sequences is superior to other methods in judging the activity in AS.combined with clinical activity index, the accuracy can significantly be improved to explore whether the activities of AS are.
authors.affiliation: Department of Radiology, Third Affiliated Hospital of Southern Medical University, Guangdong Academy of Orthopaedic Sciences, Guangzhou 510630, China.
authors.forename: Yinghua
authors.initials: Y
authors.lastname: Zhao
authors.forename: Xinai
authors.initials: X
authors.lastname: Han
authors.forename: Shaoyong
authors.initials: S
authors.lastname: Hu
authors.forename: Xingliang
authors.initials: X
authors.lastname: Shi
authors.forename: Jing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Rheumatology, Third Affiliated Hospital of Southern Medical University,Guangzhou 510630, China. Email:ewsun@263.net.
authors.forename: Erwei
authors.initials: E
authors.lastname: Sun
authors.affiliation: Email:18926191928@189.cn.
authors.forename: Shaolin
authors.initials: S
authors.lastname: Li
mesh_terms: D003287:Contrast Media; D006801:Humans; D008279:Magnetic Resonance Imaging; D013167:Spondylitis, Ankylosing
chemical_list: D003287:Contrast Media