Chapter 17
Page no. 200
17-specs.fm
GE Healthcare
Senographe DS Acquisition System
Revision 1
Operator Manual 5307907-3-S-1EN
Specifications
1-2
Maximum tolerance of displayed constants
kV and mAs:
•
kV: ± 5%
•
mAs: ± (7.6% +1.1 mAs)
Measurement Conditions:
•
kVp:
Connect an HV voltage divider (Machlett Dynalizer IIIA; ratio 10 kV/1 V) in series with the x-ray tube
and measure the voltage with a multimeter (Fluke 45 or 87).
•
mAs:
Connect an HV voltage divider (Machlett Dynalizer IIIA; ratio 10 kV/1 V) in series with the x-ray tube.
Connect a waveform analyzer (Tektronix 7854) to the output of the divider; the analyzer receives a
signal proportional to the voltage applied to the tube. The mAs values are given by:
mAs =
Where T1 is the time at which the high voltage reaches 75% of its maximum value, and T2 is the time
at which the high voltage returns to 75% of the maximum value.
Compression force and breast thickness:
•
Compression Force: ± 10 newton
•
Breast Thickness: ± 10 mm
1-3
Digital Detector
•
Field of View (FOV) of the Digital Detector: 19 cm x 23 cm
•
Digital detector type: GEMS amorphous silicon
•
Pixel format: X=1920 Y=2304
•
Detector element size: 100 microns
1-4
Workstation storage
Total internal disk capacity: 250 Gbytes.
Allocated for image storage: 194 Gbytes (corresponding to approximately 11000 acquisitions).
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