Assessment of Correlation between Intravoxel Incoherent Motion Diffusion Weighted MR Imaging and Dynamic Contrast-Enhanced MR Imaging of Sacroiliitis with Ankylosing Spondylitis
Table 3
Intra- and interobserver reproducibility in the assessment of IVIM and DCE-MRI parameters in sacroiliitis with AS.
Parameter
Intra- and interclass coefficient correlation (95% CI)
Coefficient of variation (%)
Intraobserver
Interobserver
Intraobserver
Interobserver
RE (%)
0.966 (0.940–0.982)
0.962 (0.932–0.979)
8.55
4.57
ME (%)
0.981 (0.966–0.989)
0.972 (0.950–0.985)
4.47
3.65
TTP (s)
0.974 (0.756–0.967)
0.935 (0.868–0.969)
8.31
6.87
BE (%)
0.831 (0.688–0.911)
0.804 (0.843–0.897)
11.07
4.62
Ds (×10−3 mm2/s)
0.956 (0.922–0.975)
0.924 (0.867–0.957)
7.23
3.78
0.979 (0.962–0.988)
0.967 (0.941–0.982)
4.8
2.63
Df (×10−3 mm2/s)
0.883 (0.805–0.937)
0.889 (0.806–0.938)
10.61
7.01
RE: relative enhancement; ME: maximum enhancement; TTP: time to peak; BE: brevity of enhancement; Ds: pure diffusion coefficient; : perfusion fraction; Df: pseudo-diffusion coefficient; CI: confidence interval.
