GE Senographe DS User Manual

Chapter 7 Page no. 690
JC-ELE-A-028.fm
GE Healthcare Senographe DS
Revision 1 Service Information and Procedures Class A 2385072-16-8EN
Job Card ELE A028 - Collimation Checks
7-3 Action Limit
The results from the Mo/Mo and Rh/Rh tests above must adhere to the following three action limits:
1. Congruence of the light field with the X-ray field must be such that the total misalignment (sum of
misalignments on opposite sides) is within 2% of the SID. As required by 21 CFR chapter I, Subchap-
ter J, 1020.31(d)(2)(i).
Enter measured deviations between the X-ray field and light field on the data form as follows (i.e. Y
f
for each XR-M film strip determined in step 1 of section 7-2-2) (see illustration 1 on page 681 for film
positions):
If both | Y
d
A| + |Y
d
D| and | Y
d
B| + |Y
d
C| are less than 13.2 mm then this action limit has passed.
If either | Y
d
A| + |Y
d
D| or | Y
d
B| + |Y
d
C| is more than or equal to 13.2 mm then this action limit has
failed.
Note:
If either | Y
d
A| + |Y
d
D| or | Y
d
B| + |Y
d
C| is more than or equal to 10 mm, it is recommended to adjust
the position of the Collimator Lamp according to Adjusting a Newly Installed Lamp on page 1388,
then re-perform the Collimator Checks.
Mo/Mo
- The magnitudes of deviations at the left edge and right edge (ignoring + or – signs) are entered
on the data form and added together.
- Similarly, the deviations at the anterior and posterior (chest wall) edges are entered (without
regard to sign) and the magnitudes added together.
Rh/Rh
- The magnitudes of deviations at the left edge and right edge (ignoring + or – signs) are entered
on the data form and added together.
- Similarly, the deviations at the anterior and posterior (chest wall) edges are entered (without
regard to sign) and the magnitudes added together.
Film Edge Y
f
| Y
f
A| + |Y
f
D| Is | Y
f
A| + |Y
f
D| less
than 13.2 mm?
ALeft
DRight
Film Edge Y
f
| Y
f
B| + |Y
f
C| Is | Y
f
B| + |Y
f
C| less
than 13.2 mm?
B
Anterior
C
Posterior (chest wall)
Film Edge Y
f
| Y
f
A| + |Y
f
D| Is | Y
f
A| + |Y
f
D| less
than 13.2 mm?
ALeft
DRight
Film Edge Y
f
| Y
f
B| + |Y
f
C| Is | Y
f
B| + |Y
f
C| less
than 13.2 mm?
B
Anterior
C
Posterior (chest wall)

GE Senographe DS Specifications

General

Brand	GE
Model	Senographe DS
Category	Medical Equipment
Language	English