Reflectance of the gray patches of the TE253 A / TE253 A 9x (center star):
Step | Measured Reflectance | Reference Reflectance | Deviation |
1 | 1.00 | ||
2 | 0.93 | ||
3 | 0.87 | ||
4 | 0.80 | ||
5 | 0.73 | ||
6 | 0.67 | ||
7 | 0.60 | ||
8 | 0.53 | ||
9 | 0.47 | ||
10 | 0.40 | ||
11 | 0.33 | ||
12 | 0.27 | ||
13 | 0.20 | ||
14 | 0.13 | ||
15 | 0.07 | ||
16 | 0.02 |
Serial Number:
center mark: 5 mm 12 mm cycles: 72 144
chart size: A460 A1066
The chart TE253 contains a radially sine modulated Siemens star in the center of the image. In the center of the Siemens star is a focusing target. At the border of the chart there are 16 gray patches located which are used for self-calibration. The corners are showing a bigger black square with a small white square in it. The chart has an outer size of 29.0 cm in width and 26.9 cm in height. The Siemens star has a diameter of 25 cm.
Each gray patch has a size of 2x2 cm. The Siemens star is available with 144 and 72 periods.
For full field analysis with the iQ-Analyzer nine charts of TE253 are combined in the following way:
This combination can be done in 4:3, 16:9 or any other aspect ratio due to the three stripes the Siemens stars are mounted on.
The maximum resolution of the TE253 A 9x depends on chart size and diameter of the center mark:
chart name | size | number of cycles | diameter center mark | min. resolution | max. resolution |
TE253-L | A1066 | 72 | 12 mm | VGA | 2 MP |
TE253-S | A1066 | 144 | 12 mm | 2 MP | 30 MP |
TE253-H | A1066 | 144 | 5 mm | 8 MP | 180 MP |
TE253-A460-L | A460 | 72 | 5 mm | VGA | 2 MP |
TE253-A460-H | A460 | 144 | 5 mm | 2 MP | 35 MP |
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