Users Manual Part 6

Clinical User’s Guide IBA | 46-21|
Volume 1 - Treatment Session
|Part XI - Patient Positioning and Alignment Introducing Patient Positioning and Alignment |
6. Verify patient alignment at Treatment position:
a. Take a Digital Radiograph (DR).
If you are using a gating system, follow the procedure described in Section
“Triggering Procedure” on page 48-16. Check the X-ray triggering display
(see Figure 48-2) to see that the correct gating system has been selected.
b. Use the PPVS software (e.g., adaPTinsight) to compute a correction vector.
c. If the PPVS is connected to the PTS and configured to do it, the correction
vector is transmitted automatically. Else, manually enter the correction
vector into the TCS.
WARNING Be careful to apply the movement sequence of the gantry and the
Patient Positioning System (PPS) in the correct order to ensure accurate
patient positioning for treatment. Rotating the gantry BEFORE moving
the PPS is the only correct order that ensures accurate patient
positioning.
Moving the PPS before the gantry will introduce an error in patient
positioning.
WARNING As a Radiation Therapy Technologist (RTT), do evaluate the longest
acceptable exposure time considering that taking the X-ray image may
finish after the end of the triggering cycle.
WARNING As a Radiation Therapy Technologist (RTT), check the gating signal with
respect to the presence of the X-ray beam. In case a mismatch occurs,
do NOT use the resulting X-ray images for patient alignment.
WARNING As a Radiation Therapy Technologist (RTT) it is your responsibility to
verify the appropriateness of the corrections generated by the Patient
Position Verification System (PPVS).