摘要
目的：探讨垂体动态三维增强扫描方法。材料与方法：３０例垂体微腺瘤，常规矢状位及冠状位ＳＥＴ１加权成像，然后进行冠状动态三维匙孔成像，矢状ＳＥＴ１加权增强扫描及三维冠状ＦＦＥＴ１加权扫描。冠状位动态匙孔成像扫描平面与垂体结合部平行。微腺瘤对照组冠状动态匙孔成像，采用二维多层扫描，扫描平面与垂体柄平行，其他成像参数与病例组相同。用相同大小感兴趣区测量垂体信号强度，对其测量结果进行比较。结果：新方法平扫６例阳性（２０％），２４例阴性；增强扫描１６例阳性（５３．３％），１４例阴性；动态三维增强扫描２８例阳性（９３．３％）。旧方法平扫６例阳性，２４例阴性；增强扫描１６例阳性，１４例阴性；动态二维增强扫描２４例阳性（８０％），４例假阳性。三维动态垂体信噪比平均为８．７３±０．８６（６．０～１４．６８），二维动态对照组垂体信噪比平均为４．８６±０．４２（２．３３～６．８４），信噪比增加约４４．３％。两种方法成像差异有高度显著性（ｔ＝４．０４，Ｐ≤０．０１）。结论：动态三维匙孔成像技术更敏感地发现垂体微腺瘤，避免垂体结合部的容积效应，提高了图像的信噪比及分辨率。
Objective: To study 3D dynamic enhanced MR scanning technique. Materials and Methods: Conventional coronal and sagittal SE T1WI, 3D dynamic enhanced scan were performed in 30 cases with pituitary microadenoma. The scanning plane of the coronal dynamic keyhole imaging was parallel to the combining site. 2D multiple slices, with the scanning plane paralleled to the hypophyseal stalk, were performed in 30 cases (control group). The signal intensity of pituitary gland in both groups was measured by using same size ROI. Results: Using new technique, 6 cases were positive (20%), the remaining 24 cases were negative. Using conventional enhancement, 16 cases were positive (53.3%), the remaining 14 cases were negative. Using 3D dynamic scanning, 28 cases were positive. In contrast, when old technique was used, 6 cases were positive and 24 negative. When contrast enhanced, 16 cases were positive and 14 negative. Using 2D dynamic scanning, 24 cases were positive and 4 false positive. The mean SNR was 8.730. 68 (6.014.68) in microadenoma group, and 4.860.42 (2.336.84) in control group. The difference between two groups was statistically significant ( t=4.04, P0.01). Conclusion: 3D dynamic keyhole imaging is more sensitive in detecting microadenoma than conventional enhanced dynamic imaging. Volume effect of the combining site can be avoided and, thus, SNR improved.
出处
《临床放射学杂志》
CSCD
北大核心
1999年第6期330-332,共3页
Journal of Clinical Radiology
