M1000/3000 Nova
Register 3
SPB7-230.033.11
Page 6 of 22
Siemens AG
Installation and Start-Up
Rev. 06
05.06
CS PS SP
Medical Solutions
11 - 6
Calibrating and adjusting the AEC
Configuration of the AEC
11
Definitions
11
Object table group
11
An object table group contains all object tables of the same type. There are four groups of
object tables - Grid, No grid, Magnification and Stereo. For example the object table group
Grid, consists of Grid 18x24 and Grid 24x30.
General conditions
11
When performing the settings in this chapter, there are some general conditions valid for
all settings:
•
The detector is to be in chestwall position.
•
The AEC calibration plexi must extend at least 10 mm beyond the chestwall edge of the
table and be centered, see Fig. 2, Page 11 - 8. Place the AEC calibration plexi in the
same position for all exposures.
Calibration conditions
11
Compression plate must not be used during the calibration of correction tables. From the
point sensitivity correction (fine setting) and further on, a compression plate may be used.
Reference cassette
11
Every MAMMOMAT should have a reference cassette. Use this reference cassette where
required and for the settings in this chapter. If there is no dedicated reference cassette,
pick one cassette, mark it and use it for the settings in this chapter.
Film
11
When calibrating the wings and the correction tables, it is possible to use the same film for
each exposure. However, when setting the sensitivity, the operator needs to check the
optical density and the film must be exchanged and developed between every exposure.
Mains voltage
11
Unless otherwise stated, the mains voltage and system must be ON and the service PC
program running, before performing any setting in this chapter.
Sensitivity conditions
11
•
One step (1/8 E.P.) corresponds to approximately 0.06 O.D. with an incremental gamma
of 5.
•
Measure the optical density on the emulsion side of the film.
M
A
M
0
0
6
1
6