Hologic Selenia - Page 133

Selenia User Guide
Appendix A—System Specifications
MAN-03270 Revision 003 121
Large Focal Spot Manual mAs Range:
TABLE 1 (default):
3 mAs through 400 mAs, 22 steps: 3, 4, 5, 6.4, 8, 10,
12.5, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 160, 200,
250, 320, 400.
Note
Lower limit is 4 mAs when grid is in field.
TABLE 2 (user selected):
3 mAs through 400 mAs, 55 steps: 3, 4, 5, 6, 7, 8, 9,
10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32.5, 35, 37.5,
40, 42.5, 45, 47.5, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95,
100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200,
220, 240, 260, 280, 300, 325, 350, 375, 400.
Note
Lower limit is 4 mAs when grid is in field.
Note
In AEC modes, in Large Focal spot, the mA setting adjusts
downward, if necessary, to achieve the calculated mAs. mA
can be adjusted as low as 10 mA.
Small Focal Spot Mag Manual mAs Range:
TABLE 1:
3 mAs through 100 mAs, 16 steps: 3, 4, 5, 6.4, 8, 10,
12.5, 16, 20, 25, 32, 40, 50, 64, 80, 100
TABLE 2:
3 mAs through 120 mAs, 38 steps: 3, 4, 5, 6, 7, 8, 9,
10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32.5, 35, 37.5,
40, 42.5, 45, 47.5, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95,
100, 110, 120
A.6.7.2 Accuracy, Reproducibility, and Linearity
Reproducibility
< 0.05 coefficient of variation for 10 consecutive exposures (21
CFR).
Linearity
< 0.10 for adjacent mAs selections per the following:
(X1-X2) is less than or equal to 0.10 (X1+X2) where X1 and X2
are average mR/mAs values for consecutive exposures (21
CFR).
mAs Accuracy
±5% or ±2 mAs, whichever is greater, from indicated, measured
from the ground side of the tube circuit.
kV Accuracy
Within 1 kV of the indicated kV