GE Healthcare
Senographe DS
Revision 1
Service Information and Procedures Class A 2385072-16-8EN
Job Card ELE A038 - AOP Mode and SNR Check
Page no. 707
Chapter 7
JC-ELE-A-038.fm
Job Card ELE A038 - AOP Mode and SNR Check
Chapter 7
1
SUPPLIES
None
2
TOOLS
! Notice:
To avoid false results, the plates must be clean and free from scratches.
3
REQUIRED EFFORT
Personnel: 1 Field Engineer
Time: 15 minutes
4
SAFETY PRECAUTIONS.
The procedures in this Job Card produce X-rays. Ensure that you take appropriate precautions when
operating with X-rays (for example, stay behind the radiation screen during an X-ray exposure).
5
PREREQUISITES
To allow temperature of the detector to stabilize, the system must be powered on for at least 10 minutes
before performing any measurements related to detector image quality. If any test is not passed after
allowing a 10-minute warm-up period, see the Guidance section reference in section
Action Limit.
6
PROCEDURE
6-1
Objective
The test is designed to check the following aspects of system operation:
-
Correct choice of parameters in AOP (Automatic Optimization of Parameters) mode.
-
Correct level of SNR (Signal–to–Noise Ratio) in the image.
This check is also described in the section
AOP Mode and SNR Check
of the
Senographe DS QC Man-
ual
.
6-2
Method
1. From the Browser, click the
QAP
button
. A list of tests appears.
Select the
AOP
and
SNR
Check test.
2. Install the compression paddle most commonly used by the Operator.
3. The following procedure must be carried out for each of the three thicknesses of acrylic in the field of
view (that is 25 mm, 50 mm and 60 mm).
a. Place the acrylic plates so that they lie flat on the breast support surface of the Bucky, and stack
them to make the required thickness.
b. Position the plates with the largest side aligned with the chest wall edge of the Bucky.
c. Center the plates left-to-right.
d. Apply a compression force of 5 daN to the plates.