Hologic Selenia - Table 16: Collimation Settings

Selenia User Guide
Appendix A—System Specifications
MAN-03270 Revision 003 119
A.6.4.2 X-ray Beam Filtration and Output
Inherent Tube Filtration
0.0 mm Al equivalent
Added Filtration
Two-position filter changer mechanism to carry a 60-micron
(0.06 mm) Rhodium foil filter and a 60-micron (0.06 mm)
Silver foil Filter. Type of filter is user selectable.
Beam Quality HVL for W/Rh Operation
At a given kilovolts, the measured HVL with the compression
paddle in the x-ray beam is less than the value of kV/100 +0.03
(in units of mm of aluminum).
Beam Quality HVL for W/Ag operation
At a given kilovolts, the measured HVL with the compression
paddle in the x-ray beam is less than the value of kV/100 +0.03
(in units of mm of aluminum).
Radiation Output
Equal to or greater than 230 mR/second for at least 3 seconds.
Output is measured through the Compression Paddle, 4.5 cm
above the breast support, 4.0 cm from the chest wall edge, using
exposure techniques of W/Rh target/filter, large focal spot, 28
kV.
A.6.5 X-ray Collimation
Available Collimated X-ray Fields:
Table 16: Collimation Settings
Predefined Collimation Settings
24 x 29 cm
18 x 24 cm
15 x 15 cm
10 x 10 cm
7.0 x 8.5 cm
A.6.6 Light Field Indication
Light Field Lamp
Illuminates for 30 seconds, ±5 seconds, upon pressing a Light
Field switch on either side of the x-ray tubehead or by pressing a
Compression Down switch. Extinguishes automatically upon
exposure initiation. A shatter shield is provided.
Light Field Illuminance
160 lux (minimum)—meets 21 CFR 1020.31 requirements.
Lamp is adjustable to provide alignment of the light field to the
x-ray field.
Light Field-to-X-ray Field Congruency
Within 2% of SID
A.6.7 X-ray Generator
Ripple
2% or less (typical), maximum 4%
Topology
Pulse width modulated High Frequency, active servo controlled