Siemens AG
SPB7-250.815.06.02.02
MAMMOMAT Novation DR
12.05
CS SD 24
Image Quality
65
Page 65 of 116
Medical Solutions
Test Criteria
The test will pass if
no
grid lines are visible in all images.
If grid lines are visible
- continue with “Measuring grid lines” on
(Measuring grid lines / p. 65)
on the image(s) that
didn‘t pass.
Otherwise
-
P
Record the measured value in the
“Start-up Protocol”
on
and
- continue with “Checking Image Quality” on
(Checking Image Quality / p. 71)
.
Measuring grid lines
0
1. Load the image in the
syngo Image Viewer
and select the first image where visible grid
lines were detected (see
(Checking visibility of grid lines / p. 63)
).
To do so, click the
Viewing
tab card, load the image with the
Patient -> Browser
and
select
Tools -> Rectangle
.
2. Activate magnification
(Image -> Magnify by 2.0)
.
3. Select
Tools -> Rectangle
and draw a rectangle (approx.
1 sq.cm
) on the "back-
ground" as shown in
. You have to perform the measurement approx.
2 cm
above the chest wall at the center of the detector. The rectangle should be ap-
prox.
5 cm
long
Fig. 43:
Measurement of the grid lines
4
AEC “H”
-
40
0
o
5
AEC “H”
-
40
+ 60
o
6
AEC “H”
-
40
- 60
o
Exposure
Exp Mode
mAs
PMMA /
mm
Tube Angle
Visible grid lines
(yes/no)