Users Manual Part 6

Clinical User’s Guide IBA | 49-9|
Volume 1 - Treatment Session
|Part XI - Patient Positioning and Alignment Aligning a Patient in the GTR |
Verifying Patient Alignment in Treatment
Position
When the equipment is in the Treatment position, the RTT may choose to perform
further verifications according to treatment center procedure by:
 Taking Portal View X-ray images (using adaPTinsight), following the procedure
applicable in the TR type. For detailed information, refer to section "Setting up
for Portal View X-ray Images in a GTR" on page 12-16.
 Acquiring CBCT images, following the procedure applicable in the TR type. For
detailed information, refer to section “Setting up for Acquiring CBCT Images” on
page 12-21.
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.
Correct the Tre at m e n t position, as needed (refer to the next section "Correcting the
Treatment Position").
Correcting the Treatment Position
AdaPTinsight sends correction values to the PTS as a 4x4 matrix that is displayed as
a TTCS vector.
The settings that may be corrected for the Tre a t m en t position are the:
 Translation of the couch
 Rotation of the couch (1 angle if only 1 X-ray image was acquired; 3 angles if 2
X-ray images were acquired).
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.