BACKGROUND/PURPOSE: To evaluate the diagnostic value of spectral computed tomography (CT) of @entity2720 for @entity1691 (SpA). METHODS: We retrospectively analyzed the records of 125 @entity1 with @entity1643 ( @entity1643 ) suspected of having SpA. Each @entity1 underwent sacroiliac joint spectral CT examination. Water- and @entity460 -based material decomposition images were reconstructed. After 3-6 months of follow-up, 76 were diagnosed with SpA, and the remaining 49 @entity1 were diagnosed with nonspecific @entity1643 (nLBP). The slope of sacroiliac bone marrow HU (Hounsfield unit) curve (  HU), CT value, and bone marrow to normal muscle ratios of water and @entity460 concentrations in the ilium and sacrum were calculated and compared between nLBP and SpA @entity1 . RESULTS: The iliac   HU was 8.26      3.91 for nLBP and 9.81      4.92 for SpA. The mean iliac ratios of water and @entity460 concentrations were 1.04      0.03 and 21.67      4.40, respectively, for nLBP, and 1.07      0.04 and 111.5      358.98, respectively, for SpA. The mean iliac CT values were 311.12      86.52 HU for nLBP and 423.97      127.51 HU for SpA. There were statistically significant differences in iliac ratios of water and @entity460 concentrations, CT value, and   HU between nLBP and SpA @entity1 (p  <  0.05). The sensitivity of iliac   HU was the highest. The diagnostic odds ratio of ratio of iliac @entity460 concentration was the highest, and its negative likelihood ratio was the lowest. CONCLUSION: Spectral CT not only shows @entity79 and @entity1463 , but also shows and quantitatively measures @entity236 in the @entity2720 of SpA @entity1 .

A novel diagnostic method (spectral computed tomography of @entity2720 ) for XXXX .

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity1643 :: ('MESH:D017116', 'Disease') :: ['low back pain', 'LBP'] @entity79 :: ('MESH:D001847', 'Disease') :: ['bone erosion'] @entity1691 :: ('MESH:D013167', 'Disease') :: ['axial spondyloarthritis'] @entity1463 :: ('MESH:D012598', 'Disease') :: ['sclerosis'] @entity460 :: ('MESH:D002118', 'Chemical') :: ['calcium'] @entity2720 :: ('MESH:D007592', 'Disease') :: ['sacroiliac joints'] @entity236 :: ('MESH:D001855', 'Disease') :: ['bone marrow edema']
@entity1691 :: (MESH:D013167,Disease) :: ['axial spondyloarthritis']
