Methods : The exercise duration , the ischemic score and the size of defect in blockout map of 18 patients were observed by stress and rest SPECT myocardial perfusion tomography before and after PTCA .

方法：通过运动&静息心肌灌注显像，观察PTCA前后患者运动试验结果、心肌各心室壁节段放射性异常积分及靶心图缺损范围的变化。

In new construction , it may be possible to make a full-penetration welded splice in the field before the joint is lowered into the blockout .

新的施工中，在接缝降低到封网前，可能在现场进行全贯入焊接拼接。