Quantification of fat fraction (FF) and R2* in areas of bone marrow edema (BME) and fat metaplasia in different stages Ankylosing Spondylitis (AS). 75 AS in 3 different stage (early acute group, late acute group, stable group), 42 BME and 39 fat metaplasia were detected. Difference of FF, R2* in BME and fat metaplasia in different stages were compared and relationship between FF and R2* were analyzed. Result showed R2* in fat metaplasia, but not in BME, is significantly negative with FF. FF and R2* measurements can quantitatively analyze bone marrow component change in AS.
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