弥散加权成像对强直性脊柱炎活动性骶髂关节炎的诊断价值

目的 研究弥散加权成像(diffusion-weighted imaging, DWI)在强直性脊柱炎(ankylosing spondylitis, AS)活动性骶髂关节炎的诊断价值.方法 根据修订的纽约标准,78例临床诊断为AS的慢性腰背痛患者,由风湿科医生根据Bath强直性脊柱炎疾病活动指数(BASDAI)评分及...

Role of diffusion-weighted MRI in detecting active sacroiliitis of ankylosing spondylitis

Objective：To evaluate the value of diffusion-weighted imaging in detecting active sacroiliitis in patients with ankylosing spondylitis （AS）.Materials and Methods：Based on the modified NEW YORK criteria for AS,78 patients with chronic low back pain were diagnosed AS.They were divided into two groups as active group（n=34） and chronic group（n=44） by rheumatologist according to BASDAI and laboratory parameters.Twenty-five healthy adults composed the control group.FSE-T1WI,FSE-T2WI,FS-FSE-T2WI,and DWI（SS-EPI） （b values：0,300 s/mm2） images were obtained in oblique conronal planar.Apparent diffusion coefficient （ADC） values of all sacroiliac joints（SIJs） were measured on ADC maps.ADC values of normal sacral were also measured.rADC（ADC of SIJ/ADC of sacral） was calculated.Mean （ADC） values and mean rADC values were compared between groups.Results：SWI showed more lesions in diffusion axonal injury and subarachnoid hemorrhage.Due to the image artifacts,SWI was not as good as T1 FLAIR to detected Subdural hemorrhage.SWI showed more hemorrhage lesions in HIE than other sequences.Certain types of vascular malformations with slow flow had been shown to be better visualized with SWI,including cavernous angioma,arterio-venous malformation and sturge-weber syndrome.SWI increased the visibility of tumors and was helpful for depicting hemorrhage and increased vascularity in the neoplasms,which may reflect tumor grade.Conclusion SWI was superior to the conventional sequences for visualizing hemorrhage and vascular structure.SWI can provide useful additional information in the evaluation of various pediatric neurologic conditions.