摘要
目的探讨三维薄层磁共振涎管造影的最佳回波时间(TE)。方法10名无涎腺病变志愿者,采用SENSE-FLEX-M线圈和重T2加权快速自旋回波序列,固定重复时间(TR)及其他扫描参数,依次应用不同的TE进行扫描,计算涎管和背景组织间的对比噪声比(CNR),比较不同TE下的CNR有无差异。结果不同TE所获得的CNR的差异有高度统计学意义(P<0.01)。腮腺管的显示上,TE500ms组的CNR低于其他各组,800ms组高于其他组,差异均有高度统计学意义(P<0.01),其余各组之间的差异无统计学意义(P>0.05)。颌下腺管的显示上,TE800ms组高于其他组,差异有统计学意义(P<0.05),其他各组间的差异无统计学意义(P>0.05)。结论行三维重T2加权快速自旋回波磁共振涎管造影时,应用800msTE能获得涎管与背景间最高的CNR,从而更好地显示涎腺总导管及其分支。
Objective To chose the best echo time of 3D MR sialography on a Philips 1.5-T unit by comparative study of different echo time. Methods Ten volunteers without salivary gland diseases were included in this study. SENSE-FLEX-M coil was used in every volunteer. Repitated time and other scan parameters were fixed and serial heavily T2-weighted fast spin echo sequences of different echo time and signal intensity of salivary ducts and background tissue were measured in 6 different regions of interest. Contrast to noise ratio （CNR） was measured and compared. Results The salivary gland ducts and its peripheral branches can be displayed on images of MR sialography in all volunteers. The CNR of parotid gland duct using TE 500 ms was statistically lower than those using other TEs （P〈0.01）. The CNR of parotid gland duct using TE 800 ms was statistically higher than those using other TEs（P〈0.01）. There was no significant difference between other TEs（P〉0.05）.The CNR of submandibular gland duct using TE 800 ms was statistically higher than those using other TEs（P〈0.05）. There was no significant difference between other TEs（P〉0.05）. Conclusion It is the best choice for 3D heavily T2-weighted fast spin echo MR Sialography using TE 800 ms.
出处
《苏州大学学报（医学版）》
CAS
北大核心
2008年第2期231-233,共3页
Suzhou University Journal of Medical Science
