VATECH EzRay Air Portable Manuel D'utilisation page 36

4. Operation
To ensure proper alignment between the imaging sensor and the X-ray beam, it is
recommended to use a PID (Position Indicating Device) as shown in the following
figure.
When using the PID, the exit pattern of the X-ray device should be aligned
perpendicular to the target receptor as shown in the following figure.
30
PID
Once the PID is appropriately aligned, instruct the patient
not to move.
EzRay Air Portable (Model: VEX-P300) User Manual