Abstract
To evaluate the utility of mono-exponential and bi-exponential model-based diffusion-weighted MR imaging and IDEAL-IQ sequence for differentiating the activity of sacroiliitis in ankylosing spondylitis (AS). AS patients were divided into active group (n = 30) and inactive group (n = 28) according to Ankylosing Spondylitis Disease Activity Score (ASDAS) with C-reactive protein (CRP). In addition, 30 healthy volunteers were chosen as healthy group. Subjects were scanned by conventional MRI, diffusion-weighted imaging, and IDEAL-IQ sequence. Apparent diffusion coefficient (ADC), true diffusion coefficient (D), pseudodiffusion coefficient (D*), perfusion fraction (f), and fat fraction (FF) values were measured, and their relative values (rADC, rD, rD*, rf) were calculated by the formula ADC (D,D*,f)lesion/ADC (D,D*,f)reference, respectively. The ADC, D, rADC, and rD of active group were the highest among the three groups, followed by inactive and healthy group. However, D* and rD* showed no significant difference among the three groups. FF was significantly higher in inactive group than in healthy and active group. ADC and D had significantly higher AUCs than f for differentiating active group from healthy group, while FF had the highest AUC for distinguishing inactive sacroiliitis from healthy group. DWI and IDEAL-IQ imaging are helpful in quantitatively assessing the activity of sacroiliitis in AS patients.
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This study was supported by the National Scientific Foundation of China (No. 81701648).
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This prospective study was approved by Institute Ethics Committee and written informed consent was obtained from all participants.
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Ren, C., Zhu, Q. & Yuan, H. Mono-exponential and bi-exponential model-based diffusion-weighted MR imaging and IDEAL-IQ sequence for quantitative evaluation of sacroiliitis in patients with ankylosing spondylitis. Clin Rheumatol 37, 3069–3076 (2018). https://doi.org/10.1007/s10067-018-4321-x
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DOI: https://doi.org/10.1007/s10067-018-4321-x