Planmeca Proline CC, Техническое руководство

Страница: 53 / 207

Chapter D - ADJUSTMENT & CALIBRATION
Planmeca Proline CC panoramic x-ray D-11
Technical Manual
Take an exposure. Hold the exposure down for the duration of the exposure.
CAUTION Radiation is generated when exposure button is pressed.
Press the return key to drive the cassette to the loading position, remove the cassette and proc-
ess the film.
The images of 23 balls should appear on the film (Fig. 15). 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
outermost ball to the edge of the exposed area on the right side differs more that 2mm from the
corresponding distance on the left side, the rotation start limit must be adjusted (see section
“Rotation limits” on page D-23). Note, that the adjustment of the patient positioning mechanism
must be performed first.
The distance 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 position-
ing mechanism (see section “Patient positioning mechanism adjustment” on page D-14).
Figure 15
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.
2mm
120±2mm
120±2mm
Film
Rear middle ball
Middle ball