Planmeca Proline XC Technical Manual page 73

PATIENT POSITIONING MECHANISM Chapter D - ADJUSTMENT & CALIBRATION
The images of 23 balls should appear on the film. They should be round, all the same size,
and evenly spaced. Note that they will not necessarily be at the same vertical height. The dis-
tance from the center of the middle ball to the center of the tenth ball to the left and the tenth
ball to the right should be 120mm ± 2mm. If this distance is correct then the patient position-
ing mechanism need not be adjusted, and you should then check the patient positioning lights
(see section 5 "PATIENT POSITIONING LIGHTS" on page D-31).
120±2mm 120±2mm
Film
Figure 35
If these distances are not correct you will have to adjust the position of the patient positioning
mechanism. The following diagrams are a rough guide as to how to position it correctly. Note
that you may have to make more than one adjustment as the patient positioning mechanism
could be incorrectly positioned in more than one direction. For example it may be too far for-
ward and too near the column.
If the distance from the middle ball to the center of the tenth ball on the left-hand side is more
than 122mm and on the right-hand side less than 118mm then the patient positioning mecha-
nism must be moved away from the column.
Right-hand side
Film
Less than 118mm
More than 122mm
Figure 36
Planmeca Proline XC X-ray unit D-19
Technical Manual