Ogura Ichiro, Sasaki Yoshihiko, Oda Takaaki, Sue Mikiko, Hayama Kazuhide
Chin J Dent Res. 2018;21(1):63-68. doi: 10.3290/j.cjdr.a39919.
To assess the correlation between conventional magnetic resonance (MR) imaging and MR sialography of parotid glands with salivary gland scintigraphy in patients with Sjögren's syndrome.
A retrospective study was conducted on eight patients with Sjögren's syndrome who underwent MR imaging and salivary gland scintigraphy. Conventional MR imaging techniques, such as T1-weighted images (T1WI), T2-weighted images (T2WI), and short TI inversion recovery images (STIR) were used for changes of fat signal in the parotid gland, while the MR sialography were used for ducts dilation of the parotid gland. Regarding scintigraphy, time-activity curves of each parotid gland were analysed. The salivary gland excretion fraction was defined as A (before stimulation test (counts/20 s)) and B (after stimulation test (counts/20 s)).
Regarding characteristic appearances of fat signal, the A/B of parotid gland with homogeneous intensity distribution (3.51 ± 0.75) was higher than that with heterogeneous intensity distribution (1.56 ± 0.66, P = 0.001). Regarding MR sialographic stages, the A/B of parotid gland with stage 0 (3.51 ± 0.75) was higher than that with stage 1 (2.03 ± 0.86, P = 0.009) and with stage 2 (1.26 ± 0.25, P = 0.000).
The results suggest that MR sialography of the parotid glands is a useful noninvasive tool for evaluating the decrease of salivary gland excretion in patients with Sjögren's syndrome.
评估干燥综合征患者腮腺的传统磁共振（MR）成像及MR涎管造影与唾液腺闪烁扫描之间的相关性。
对8例接受MR成像和唾液腺闪烁扫描的干燥综合征患者进行回顾性研究。采用常规MR成像技术，如T1加权像（T1WI）、T2加权像（T2WI）及短TI反转恢复像（STIR）观察腮腺内脂肪信号变化，同时采用MR涎管造影观察腮腺导管扩张情况。对于闪烁扫描，分析各腮腺的时间-活性曲线。唾液腺排泄分数定义为A（刺激试验前（计数/20秒））和B（刺激试验后（计数/20秒））。
关于脂肪信号的特征性表现，强度分布均匀的腮腺A/B值（3.51±0.75）高于强度分布不均匀的腮腺（1.56±0.66，P = 0.001）。关于MR涎管造影分期，0期腮腺的A/B值（3.51±0.75）高于1期（2.03±0.86，P = 0.009）和2期（1.26±0.25，P = 0.000）。
结果表明，腮腺MR涎管造影是评估干燥综合征患者唾液腺排泄减少的一种有用的无创工具。
