Siemens AG SPB7-250.815.06.02.02 MAMMOMAT Novation DR
12.05 CS SD 24
Image Quality 71
Page 71 of 116
Medical Solutions
• Connect the oscilloscope as follows:
Channel 1 to measuring point HV_ACT on the D750, 1 V/T.
Channel 2 to measuring point Grid_M on the D802, 10 V/T.
Select time base 0.4 s/T.
• Switch the System ON
• Select 28 kV, Mo/Mo, 500 mAS; release an exposure
• Evaluate the oscilloscope diagram.
The period of the high voltage in a steady state condition (after the 3rd period) has to be
between 500 ms and 750 ms. See diagram:
Fig. 50: Grid speed
If the grid lines are still visible after this process , increase. i.e. ( change) the grid slow
speed from 40% to 50% and run this test again.
Checking Image Quality 0
While calibration is typically performed by the customer as part of normal system opera-
tion, calibration information is provided in the event that you are required to perform a sys-
tem calibration.
To calibrate the system, proceed as follows:
• First, perform a gain calibration of the detector and check the images for bad pixels.
• If you observe any bad pixels in the image, create the bad pixel mapping and perform
a gain calibration of the detector afterwards.
If you have to troubleshoot image quality problems, please see the chapter "Trouble-
shooting image quality" on (Troubleshooting image quality / p. 108).
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