Additional Adjustment Method To Check The Eccentricity Of The Rotation Movement: Reference Axis Mode - Planmeca ProMax X-ray Instruction Manual

Chapter E - C-ARM AND IMAGING ARM
1.11 Additional adjustment method to check the eccentricity of
the rotation movement: reference axis mode
NOTE This additional adjustment method described in the this chapter cannot be used for a
ProMax with a fixed collimator.
NOTE This additional adjustment method is only possible to perform if the panoramic radia-
tion beam appears clearly within the borders of the alignment tool rectangle. For digital
X-ray units this can be checked according to the instructions given in section 1.2
"Checking the panoramic beam position" on page E-4.
The angle sensors must be calibrated before performing this adjustment. Refer to sec-
tion 2.1 "Calibration of angle sensors" on page E-56.
The layer light must be calibrated, refer to section "Layer light calibration" on page F-
3.
Before performing this adjustment take a ball phantom exposure as described in section 1.9
"Checking the adjustments" on page E-31. You can see the errors in the ball phantom image
and you can compare this ball phantom image with the one taken after adjustment.
Remove the inner cover from the tube head assembly, the sensor head covers and the lower
cover of the C-arm as well as the shoulder arm cover. Refer to section 3 "REMOVING THE
COVERS" on page E-85. Remove the cover of the patient support table, refer to section 2.1
"Patient support table cover" on page F-7.
To be able to move the C-arm either switch off the X-ray unit or enter the Test exposure mode
(i460). Attach the ball phantom to the patient positioning mechanism adapter. Attach the sen-
sor head alignment tool to the sensor head connector.
Manually position the C-arm as shown in Fig. 72. Slide the alignment pin through the hole in
the shoulder joint so that it goes into the positioning holes in the shoulder arm and column
and slide the alignment pin through the hole in the elbow joint so that it goes into the position-
ing hole in the C-arm.
Figure 72
E-44 ProMax X-ray unit with Dimax3
PANORAMIC BEAM AND PATIENT POSITIONING MECH-
Technical Manual