Calibration
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4.6.3. Collimator Centering
Collimator Iris Centering Check / Calibration:
1. Position the C-arm with Image Intensifier up and Monoblock down.
2. Log in software service mode, in calibration TAB, click “Beam alignment…” button.
3. Take exposure in Normal Fluoro and ABS mode and adjust the BAFT to make BAFT center is match the
display center (≤3mm, between BAFT and cross mark).
4. Take exposure in Normal Fluoro and ABS mode, open/close the iris slow and continuously to show the
iris near circular mask and verify that the iris leaves is shown as balanced along the circular mask
around all angles.
The distance between leaf_1/2/3/4 and circular mask shall equal to the distance between opposite
leaf_5/6/7/8 and circular mask, and tolerance of two scales is ≤4 scales of display mark.
5. If not aligned, open the collimator cover, loosen the set screws (2 pieces), and adjust the collimator
iris alignment screws (2 pieces) to center the collimator on the BAFT (Use the BAFT image to
determine the direction to shift the collimator iris). Repeat step4 and 5 to center the collimator.
6. Fasten the set screw of collimator.
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