Chapter 17
Page no. 202
17-specs.fm
GE Healthcare
Senographe DS Acquisition System
Revision 1
Operator Manual 5307907-3-S-1EN
Specifications
2-7
Filters and anode tracks
Maximum current for each track/focal spot configuration:
The minimum filtration permanently installed in the useful beam of the X-ray tube is 0.008 mm aluminum
equivalent (8 µm aluminum equivalent) at 30 kV corresponding to the minimum thickness of beryllium of
the x-ray tube output window.
The switched filters are installed on a disk driven by a stepping motor which moves from one filter to the
other. Two different filters are supplied:
•
Molybdenum: 0.03 mm,
•
Rhodium: 0.025 mm,
Note:
The system electronics control the filters according to operator requirements in Manual mode, or
to software requirements in AOP mode
2-8
Attenuation equivalence
Attenuation equivalence for components in the X-ray beam (in accordance with FDA HHS 21 CFR,
§ 1020.30; measurements made at a potential of 100 kVp, using an X-ray beam with an HVL of 2.7 mm
of aluminum)
2-9
Main characteristics of the grid
•
Type: linear
•
Number of lines: 31 line pairs/cm.
•
Grid ratio: R 5 : 1.
•
Focal length: F0 = 650 mm
Track
Focal spot
Mo
Rh
Large
100 mA max.
62 mA max.
Small
40 mA max.
35 mA max.
TARGET
VOLTAGE
(kV)
FILTER
EQUIVALENCE
(
half-value layer
)
Molybdenum
30
0.03 Mo
0.3 mm Al minimum
Molybdenum
30
0.025 Rh
0.35 mm Al minimum
Rhodium
30
0.025 Rh
0.4 mm Al minimum
Component
Al equivalence (mm)
Magnification stand (1.5 and 1.8)
less than 0.35
Image receptor support
less than 0.2
Bucky cover
less than 0.2
Stereotix positioner
less than 0.3
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