4. Line Target System
There are 8 groups of line targets disposed in TM material as shown in the figure.
1．A1——A4：
Axial resolution target group. The upmost lines in each target locate at the depth of 10, 30, 50,
70mm, the center longitudinal distances of each group (from the top down) are 3, 2, 1, 0.5mm, and
the horizontal distance is 1mm.
2．B1——B4：
Lateral resolution target group. Locate at a depth of 10, 30, 50, 70mm, with a center horizontal
distance of 4, 3, 2, 1mm in each group.
3．C：
Longitudinal target group. 12 target lines with a 10mm center distance between adjacent lines.
4．D：
Horizontal target group. Locate at a depth of 40mm, with a 20mm center distance between adjacent
lines.
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