T2 mapping与IDEAL-IQ序列定量评估冈上肌腱损伤及脂肪浸润的价值OA

Objective To quantitatively assess the degree of supraspinatus tendon injury and supraspinatus muscle fatty infiltration in patients with rotator cuff injury using T2 mapping and iterative decomposition of water and fat with echo asymmetry and least-squares estimation quantitation(IDEAL-IQ)sequences,and to analyze their relationship with age.Methods Sixty patients with rotator cuff injury showing supraspinatus tendon injury on conventional MRI(20 cases each with grades 1-3)and 20 healthy controls were retrospectively collected.According to the degree of injury,subjects were divided into four groups:grade 1 group(tendinitis),grade 2 group(partial tear),grade 3 group(complete tear),and healthy control group(grade 0),with 20 shoulders included in each group.All subjects underwent shoulder MRI,including conventional sequences,oblique coronal T2 mapping sequence,and oblique sagittal IDEAL-IQ sequence.T2 mapping values of the medial,middle,and lateral subregions of the supraspinatus tendon and the fat fraction(FF)of the supraspinatus muscle were measured.Kruskal-Wallis H test was used to compare differences among groups,and Spearman correlation analysis was performed to evaluate correlations of the parameters with injury grade and age.Results With increasing supraspinatus tendon injury grade,T2 mapping values in all subregions of the supraspinatus tendon and FF values of the supraspinatus muscle showed increasing trends,and the differences among the four groups were statistically significant(all P<0.05).T2 mapping values in all subregions of the supraspinatus tendon(medial:rs=0.966;middle:rs=0.963;lateral:rs=0.959)and supraspinatus muscle FF values(rs=0.968)were significantly positively correlated with supraspinatus tendon injury grade(all P<0.001).Injury grade(rs=0.800),T2 mapping values in all tendon subregions(medial:rs=0.756;middle:rs=0.800;lateral:rs=0.759),and supraspinatus muscle FF values(rs=0.772)were also significantly positively correlated with age(all P<0.001).Conclusion T2 mapping and IDEAL-IQ sequences can quantitatively assess supraspinatus tendon injury and the degree of fatty infiltration.T2 mapping values in all supraspinatus tendon subregions and supraspinatus muscle FF values are significantly positively correlated with injury grade and age.The combined application of these two MRI techniques can provide an objective and reliable imaging basis for clinical decision-making.