Planmeca Proline CC, Техническое руководство

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Chapter E - DIMAX3 DIGITAL SYSTEM ADJUSTMENT
E-28 Planmeca Proline CC panoramic x-ray
Technical Manual
The images of 23 balls should appear on the image (Fig. 51). They should be round, all the same
size, and evenly spaced. Note that they will not necessarily be at the same vertical height. The
outermost balls on the left and right sides should appear symmetrically. If the distance from the
center of the middle ball to the center of the tenth ball on the right side differs more than 2mm
from the corresponding distance on the left side,, the rotation start limit must be adjusted (in the
same way as in the film-based panoramic x-ray, see section “Rotation limits” on page D-23).
Note, that the adjustment of the patient positioning mechanism must be performed first. The dis-
tance from the center of the middle ball to the center of the rear middle ball should be less than
2mm. If the distance is not correct you will have to adjust the position of the patient positioning
mechanism (see section “Patient positioning mechanism adjustment” on page E-31).
Figure 51
NOTE Before you can measure the true distance between the balls, you have to define a refer-
ence distance as follows:
Click the CAL button and then draw a long horizontal line to the image by clicking the
start point, releasing the mouse button and clicking the end point. The Reference distance
window appears.
Calculate the line length using the formula A x 0.132mm = B, where A is the distance in
pixels and B is distance in millimetres. Enter the value B (line length in millimetres) to the
Reference distance window and click OK.
The distance from the center of the middle ball to the center of the tenth ball to the left and
the tenth ball to the right can now be measured.
The distance 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 posi-
tioning mechanism need not be adjusted, and you should then check the patient positioning
lights (see section “PATIENT POSITIONING LIGHTS” on page D-19).
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 forward and too
near the column.
L R