MRI中C线位扫描在显示胎儿颅后窝池发育异常中的应用  

The Application of C-line Scan in the Diagnosis of Fetal's Posterior Fossa Abnormalities

作　　者：沈敏花[1] 张国福[1] 王雪珍[1] 田晓梅[1] 钱慧君[1] 马凤华[2] 

机构地区：[1]复旦大学附属妇产科医院 [2]复旦大学附属金山医院

出　　处：《中国医学计算机成像杂志》2015年第5期492-496,共5页Chinese Computed Medical Imaging

摘　　要：目的:探讨MRI C线位扫描在显示胎儿颅后窝池增宽的临床应用价值。方法:采用Siemens Avanto1.5T超导磁共振扫描仪,对30例B超怀疑颅后窝池增宽的中、晚期孕妇进行MR常规及C线的扫描,分别测量常规横断位及C线位颅后窝池最大宽度值,与B超测量颅后窝池宽度值对照,分别采用配对t检验对最大宽度值进行比较;以B超结果为标准,分别记录各组增宽例数,对各组检出率进行卡方检验。结果:B超测量颅后窝池平均宽度数值为(11.4±2.17)mm,常规横断位测出颅后窝池均值为(13.3±4.69)mm,而C线位测出颅后窝池宽度均值为(11.6±2.62)mm;常规横断位与B超测量值、C线测量值差异均有统计学意义(t=2.386,2.308,P=0.024,0.028<0.05),C线位与B超测量值常差异无统计学意义(t=0.54,P=0.589>0.05)。以B超测量最大宽度值≥10mm来诊断颅后窝池增宽,B超增宽26例(87%),常规横断位增宽21例(70%),C线位增宽25例(83%),三者检出率无显著性差异(P=0.126>0.05)。结论:以B超测量值为标准,C线位对颅后窝池增宽的测量值较常规横断位更具有重要参考价值。Purpose： To evaluate the clinical value of C-line scan in fetal posterior cranial fossa abnormalities. Methods： Thirty pregnant women with suspected fetal posterior cranial fossa abnormalities by ultrasound were undergone MRI scan within one week on a Siemens Avanto1.5 T scanner. All the head of the 30 fetuses were examined using the conventional axial and C line MR scanning. Referring to the result of ultrasound, the maximum diameters of the posterior cranial fossa were recorded and compared by paired t test. The abnormal rate between two groups were compared by Chi square test. Results： Of these 30 cases, 30 fetuses were clearly displayed. The anatomical structures of the thalamus, the cerebellum, posterior cranial fossa were clearly shown on both C line and conventional axial scanning. On the images of the C line, the anatomical structures of the thalamus, the cerebellum, posterior cranial fossa coexisted on the same image; while the conventional axial images could not display the above structure on the same level. The mean maximum diameter of posterior cranial fossa measured by ultrasound, conventional axial and C line was 11.4±2.17 mm, 13.3±4.69 mm and 11.6±2.62 mm respectively. There were significant differences between the results from conventional axial and C line, ultrasound（t= 2.386,2.308, P=0.024,0.028〈0.05）, while there was no significant difference between that from ultrasound and C line（ t=0.54,P=0.589）. Referring to the diagnostic standard（〉10mm）, the abnormal number of each group were 26（87%, ultrasound）, 25（83%, C line）, and 21（70%, conventional axial）. There was no significant difference among the three groups（P=0.126, P〉0.05）. Conclusion： Referring to the result of ultrasound, the anatomical structure of posterior cranial fossa can be clearly displayed on both the C line and the conventional axial scan, but the accuracy of the C line is higher than that of conventional axial scan.

关 键 词：胎儿 磁共振成像 C线 

分 类 号：R445.2[医药卫生—影像医学与核医学]