Value of Application of MRI Fat Suppression Technique STIR Sequence in Detecting Sacroiliac Joint in Ankylosing Spondylitis

Wang Guoqing

doi:10.3969/j.issn.1004-5775.2024.22.014

Abstract：Objective:To investigate the value of MRI fat suppression technique in the detection of sacroiliac joint in ankylosing spondylitis(AS).Methods:60 patients with AS in the hospital from January 2022 to July 2023 were studied.All patients underwent magnetic resonance imaging(MRI).The scan sequences included T1-weighted images(T1WI),T2-weighted images(T2WI),T2-weighted fat suppression(FS-T2WI)and short time reversal recovery sequences(STIR).The abnormal signals of each scan sequence were recorded,and the image uniformity of the left and right sides of the sacroiliac joint,SNR and CNR of the buttock muscle on both sides,and the image quality scores of the SNR and CNR of the patients with bone marrow edema were compared.Results:In 60 patients with AS,signal abnormalities were detected by MRI:51 patients with T1WI(85.00% ),48 patients with T2WI(80.00% ),59 patients with fat inhibition(FS-T2WI and STIR)(98.33% ).Among the 60 patients,the image uniformity of the right side of FS sequence was higher than that of the left side,the SNR of the right side of FS sequence was higher than that of the left side,and the CNR was lower than that of the left side,with statistically significant difference(t=1 359.047,19.022,21.410;P＜0.05).STIR sequence SNR and CNR of 32 patients with bone marrow edema were higher than FS sequence,and the difference was statistically significant(t=6.457,6.330;P＜0.05).The fat inhibition uniformity,lesion significance,artifact,and overall quality of STIR sequence were higher than those of FS sequence,and the anatomical structure score was lower than FS sequence,with statistically significant difference(t=44.274,73.891,34.326,25.544,20.440;P＜0.05).Conclusion:MRI fat suppression technique can detect bone marrow edema of sacroiliac joint in ankylosing spondylitis early,and STIR sequences of fat suppression sequence have better image quality,especially for patients with bone marrow edema.So it is worthy of clinical promotion.