to intend evaluation the ankylosing spondylitis patient that sacrum ilium arthrositis MR imageology feature, and comparison X-ray plain fil, CT and MR image in the diagnosis sacrum ilium arthrositis effects.

• 目的 :旨在评估强直性脊柱炎 (AS)患者骶髂关节炎的MR影像学特征。 并比较X线平片、CT和MR影像在诊断骶髂关节炎中的作用。