颞下颌关节盘前移位患者髁突与脑皮质磁共振信号强度比较

目的:通过比较正常颞下颌关节结构和盘前移位伴髁突吸收患者的磁共振影像中髁突与脑实质信号密度比值(MSI1/MSI2)的差异,探索髁突吸收的磁共振定量测量方法.方法:收集2018年7月—2019年7月间于上海交通大学医学院附属第九人民医院行颞下颌关节磁共振检查的22～25岁女性患者资料,分为正常关节和髁突吸收2组,每组1...

The difference of MRI signal intensity between condyle and brain parenchyma in cases of temporomandibular joint disc displacement

PURPOSE: To compare the difference of signal density ratio between condyle and brain parenchyma in normal temporomandibular joint(TMJ) structure and patients with anterior disc displacement and condylar absorption, and to explore the quantitative measurement method of condylar absorption. METHODS: From July 2018 to July 2019, 22-25 year-old women who underwent MRI examination of TMJ were collected and divided into two groups: normal joint group and condylar absorption group. A total of 40 joints in the 2 groups were measured independently by 2 investigators, and the consistency between the 2 measurers was compared. The differences of MSI1/MSI2 between the 2 groups were compared. SPSS 23.0 software package was used for statistical analysis. RESULTS: There was a high degree of consistency from the 2 investigators. At the same time, there was significant difference between the 2 groups in the ratio of condylar signal density to brain parenchyma. The mean value of MSI1/MSI2 was 1.07 in normal joint group, and 0.78 in condylar resorption group(P<0.05). CONCLUSIONS: MSI1/MSI2 may be an objective index to evaluate the severity of condylar lesions by using standardized TMJ MRI shooting process.