5 Setups, alignments and adjustments
60 GE Healthcare 32551-IMG rev 6
5.1.6 Service menu program #65 tAr
1 Select the program number 65 (tAr) with the kV+ button.
2 Press Autoexp to enter the tAr program. The density display shows
“0”. The kV display shows the compression thickness and the mAs
display shows the corresponding target time.
In this mode the target times for different thicknesses can be seen by
driving the compression paddle up and down.
3 Insert the bucky for large focus programming and magnification
stand for small focus programming. Also, both filters must be
programmed.
The Alpha RT AA- mode utilizes automatic kV procedure which selects the
used kV according to the breast thickness and a target time (= aimed
exposure time). The target time depends on the compressed breast
thickness and is linear curve calculated from two programmed points. See
a graph below.
#64AEC/U The density display shows U. In A- and AA-modes, the
parameter U enables the separate optical density
corrections for the following:
– - for all kV steps within 20 - 35 kV
– - for Molybdenum and Rhodium filter separately
– - for Bucky, Magnification and cassette holders
separately
The range for kV correction is 0.70 - 1.30, while the default
value is 1.0.
#64AEC/S The density display shows S. The parameter S enables the
adjustment of the extent of the Density-button steps,
according to customer wishes or local regulations.
The density steps can be adjusted within a range of 5%-20%
(denoted in the screen as 5-20). The default setting is 10
(means that each time the density buttons of the Control
Panel are pressed, there will be a 10% increase or decrease
in density value, depending on which density button was
pressed).
In order to adjust the density steps:
1enter program 64
2 select parameter S
3 select required step value
4 exit the service program
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