Meanwhile there was no significant difference of image quality between the two mA in coronal directscan (P>0.05).
而直接扫描冠状面图像质量无明显下降（P>0·05）；
2
Geometric distortion in 5 different fields of view (FOV) was calculated by measuring the absolute borderline error of directscan and coronal digital reconstructed radiograph (DRR).
And DEPTNO should be listed second, allowing DB2 to do a direct index lookup on the first column (EMPNO) and then a scan on the second (DEPTNO) for the greater-than.