摘要
目的：探讨正常心脏心肌在Ｇｄ－ＤＴＰＡ动态ＭＲＩ上的信号表现及动态变化规律。材料和方法：１２例正常心脏于０．３５～０．３８ＴＭＲＩ机上作Ｇｄ－ＤＴＰＡ增强前后ＭＲＩ检查，增强后为动态观察。结果：左心室前壁、侧壁、下壁以及室间隔的信号强度在增强前其差别无统计意义（Ｐ＞０．０５）；增强后及其动态观察中，各时间段内各部心肌信号率差别无统计意义（Ｐ＞０．０５）。正常心肌增强后呈均匀一致强化，最大强化是在增强后５分钟内，随增强时间延长而递减。结论：正常心肌在Ｇｄ－ＤＴＰＡＭＲＩ增强前后的信号均匀一致，局部心肌信号增高或减低应视为病理改变。
To study the dynamic changes of myocardial signal intensities in normal subjects by Gd -DTPA enhanced MRI.Materials and Methods; 12 cases of normal hearts were examined before and after Gd-DTPA enhancement by 0.35￣ 0.38T MRI set also with dynamic observation on the latter.Results:The signal intensities revealed no significant differences among various parts of myocardium such as interventricular septum,lateral wall of left ventricle (LV),inferior wall of LV and anterior wall of LV on the preenhancement images,nor did on the images of different timed and dynamic scannings after enhancement(P>0.05) .Myocardial signal intensity increased uniformly after intravenous administration of Gd-DTPA, and reached its peak in 5 minutes after enhancement and decreased gradually on the delayed enhanced scannings.Conclusion: No matter whether on preenhancement or postenhancement scans the myocardium showed homogeneous signal intensity.Regional signal intensity increased or decreased should be considered as abnormal.
出处
《中国医学计算机成像杂志》
CSCD
1996年第2期96-98,共3页
Chinese Computed Medical Imaging
