CPI Canada Inc.
ABS Calibration
3E
Millenia / Indico 100 Series Service Manual Ch # 740904-07 Rev. D
Page 3E-5
3E.1.4 Required Test Equipment
The following test equipment is required for ABS calibration.
•
Resolution test pattern for imaging focusing.
•
Central ray alignment fixture.
•
Collimator centering test pattern.
•
A selection of Al filters for HVL determination.
•
A selection of body absorbers such as sheets of pure copper (1.0 to 7.5 mm). Refer to table 3E-1 for
equivalent thickness of various absorbers.
3E.1.5 Absorber Equivalents
Table 3E-1 shows the absorption equivalency for copper, water and aluminum. These values are based
on 75 kVp.
Cu (mm/in)
Water (cm/in)
Al 1100 (cm/in)
0.5 / .020
7.6 / 3.0
1.27 / 0.5
1.0 / .039
15.2 / 6.0
2.54 / 1.0
2.0 / .079
30.5 / 12.0
5.33 / 2.1
3.0 / .118
45.8 / 18.0
7.87 / 3.1
4.0 / .157
*
*
5.0 / .196
*
*
6.0 / .236
*
*
7.0 / .276
*
*
8.0 / .315
*
*
Table 3E-1: Equivalent thickness of various absorbers
* = Water/aluminum thickness at these values too great to be practical.
