Assessment of Correlation between Intravoxel Incoherent Motion Diffusion Weighted MR Imaging and Dynamic Contrast-Enhanced MR Imaging of Sacroiliitis with Ankylosing Spondylitis

Table 4

Intra- and interobserver variation in the assessment of IVIM and DCE-MRI parameters in sacroiliitis with AS.

Parameters	RE (%)	ME (%)	TTP (s)	BE (s)	Ds (×10^−3 mm^2/s)		Df (×10^−3 mm^2/s)
Intraobserver	−23.73–24.94	−66.44–66.77	−30.00–52.74	−64.36–50.3	−0.36–0.24	−0.03–0.04	−39.6–28.12
Interobserver	−15.62–30.76	−71.47–40.48	−28.12–22.97	−10.31–53.98	−0.19–0.22	−0.04–0.03	−35.75–30.60

RE: relative enhancement; ME: maximum enhancement; TTP: time to peak; BE: brevity of enhancement; Ds: pure diffusion coefficient; : perfusion fraction; Df: pseudo-diffusion coefficient. Values are presented as 95% limits of agreement (LoA, limits of agreement; mean interdevice difference; spans of limits of agreement).