Hologic Selenia - Page 130

Selenia User Guide
Appendix A—System Specifications
118 MAN-03270 Revision 003
A.6.3.2 X-ray Beam Filtration and Output
Inherent Tube Filtration
0.0 mm Al equivalent
Added Filtration
Two-position filter changer mechanism to carry a 30-micron
(0.03 mm) Molybdenum foil filter and a 30-micron (0.03 mm)
Rhodium foil Filter. Type of filter is user selectable.
Beam Quality HVL for Mo/Mo Operation
At a given kilovolts, the measured HVL with the compression
paddle in the x-ray beam is equal to or greater than the value of
kV/100+0.03 (in units of mm of aluminum) but less than the
value of kV/100+0.12 (in units of mm of aluminum).
Beam Quality HVL for Mo/Rh operation
At a given kilovolts, the measured HVL with the compression
paddle in the x-ray beam is equal to or greater than the value of
kV/100+0.03 mm Al (in units of mm of aluminum) but less
than the value of kV/100+0.19 mm Al (in units of mm of
aluminum).
Radiation Output
Equal to or greater than 800 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 Mo/Mo target/filter, large focal spot, 28
kV.
A.6.4 X-ray Tube: Tungsten
Tube Voltage
22 kV to 39 kV
Tube Current
Large Focal Spot = 100 mA between 25 and 32 kV
Small Focal Spot = 30 mA between 25 and 32 kV
Anode Rotation
180 Hz (9500 RPM minimum)
Anode Angle
Bi-angular: Large focal spot at 16°, Small focal spot at 10°.
X-ray tube angle at 6° to provide 22° (Large FS) and 16° (Small
FS) anode to Image Receptor plane angle.
Anode Material
Tungsten
X-ray Window
Beryllium 0.8 mm thickness (maximum)
A.6.4.1 X-ray Tube Housing
Over Temperature Protection Sensor
Internally connected in series with the stator common lead.
Maximum Temperature, Tube Housing
Surface
55 °C (151° F)
Maximum Temperature, Tube Head Cover
Surface
41 °C (105.8° F)
Safety Class
IEC 60601-1, Class I, Type B, IEC 60601-2-28