ARCADIS Avantic SPR2-330.662.01 Page 4 of 6 Siemens AG
Rev. 02 05.06 CS PS SP Medical Solutions
5 - 4 Function tests
4 Check the I.I. format 5
Work sequence:
1. Select the full I.I. input format.
2. Set the iris diaphragm to max. aperture
3. Switch on fluoroscopy
If all eight blades of the iris diaphragm are still visible at the edge of the TV monitor
(Fig. 2), no further tests are necessary.
4. Select zoom format (check as in item 3).
6 Check the smallest field size 5
The smallest field size should be < 5 cm x 5 cm at the I.I. input.
The check is made at the TV monitor.
1. Select full I.I. view format.
2. Close the iris diaphragm and select full I.I. view format.
3. Attach a center cross with lead ruler to the center of the I.I. input screen.
4. Switch on fluoroscopy.
5. Read the size of the X iris on the monitor.
Fig. 2
I.I. format in order YES NO
Zoom format in order YES NO
Smallest field size at the I.I. input: ........ cm x ........ cm
TV image
Blades, iris diaphragm
During fluoro, neither the length nor the width of the
radiation field in the plane of the image receptor may
exceed that of the visible area of the image receptor
by more than 3 % of the SID (focus - I.I. distance).
The sum of the longitudinal deviation X and the width
deviation Y shall be no greater than 4 % of the SID.
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