Mammomat 1000/3000
Register 3
SP B7-230.033.07
Page 8 of 12
Siemens-Elema AB
Installation and Start-Up
Rev. 03
11.99
SPS-UD
Solna, Sweden
11 - 8
Start-up and functional test of the IONTOMAT
Checking the film density
11
The sensitivity to be programmed must be determined by means of test exposures with
anode/filter combination Mo/Mo at 25 kV, or kV preferred by the customer, and 20 mm
plexiglass.
The plexi must extend at least 30 mm behind the rear edge of the detector marking on the
compression plate and 10 mm beyond the chest wall edge of the table.
The detector shall be nearest the chest wall.
When making test exposures, ensure correct positioning of the plexiglass plates.
Start with the sensitivity listed in table 1 and adjust a density of approx 1.5 ("Sensitivity
H"). Repeat this procedure on the other "wing" (base plate).
Change to the other film/screen combination, if used, and program "Sensitivity D" for the
density as above. Repeat this procedure on the other "wing" (base plate).
The final values are dependent on the type of cassette used and desired optical density.
Fig. 4
Detector nearest chest wall. Place the plexi plates in the same
position for all exposures and measure the density as shown
above on the emulsion side of the film.
Minimum projecting
Length: 10 mm
Plexiglass plate
Object table
40 mm
Measuring
point
approx
NOTICE
