Siemens MAMMOMAT Balance Troubleshooting Manual page 17

ALARM
Code
When
After pre exposure
Why
Breast and / or detector position is/ are wrong, part of detector was exposed to direct x-
ray beam.
Breast or phantom density was too low.
Action
Check for proper breast / detector positioning or thin phantom.
Note
Film must be replaced.
Delivered mAs are less than 1 mAs
ALARM
Code
When
After pre exposure
Why
Breast density is too high and [p] value lower than limit selected during AEC calibration
Breast could have silicone prosthesis.
Refer to AEC calibration procedure for [p] lower limit calibration.
Action
Reduce breast density and check for AEC calibration with reference phantom.
Note
Film must be replaced.
Delivered mAs are less than 1 mAs
ALARM
Code
When
After exposure
Why
Could happen with magnification and small focus if grid table is used and breast is large or
very dense.
Can also happen for calibration problems or system malfunction.
Action
Evaluate operating conditions and eventually use One point mode with higher kV.
Note
Quite impossible with large focus, if happens check very carefully mA, kV, [r] and [o]
calibrations.
MAMMOMAT Balance
Troubleshooting Guide
AEC DETECTOR OVER EXPOSED
BREAST TOO DENSE
LOW mAs SELECTION WITH AEC
SPB7-115.840.01 Page 17 of 62
Rev.02 10.04
Troubleshooting
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