MOSAIQ User's Guide - UCSF Radiation Oncology

CHAPTER 7: Image Management-ViewStation & Photos and Diagrams
7. Click Close twice to close the Treatment Delivery Table dialog box and Treatment
Chart window.
CAUTION
Planar Image Registration
If you are treating a field, when you click Select in the Treatment
Delivery Table dialog box, the Port Film Status window opens if the
field has associated images that require changes or reviews or has a
Voided or Rejected review status.
The system only issues the alert to open the Port Film Status
window if the Portal Image Check check box is selected in the
system utilities. Click File | System Utilities | Department
Setup…, then click the Clinical (RO) tab to make sure that this
check box is selected. If the Portal Image Check check box is not
selected, contact your system administrator.
Image Registration is the process that you use to fuse a verification (portal/treatment) image
with a reference (DRR or simulator) image then calculate positional offsets for patient
positioning. Given the two images with their corresponding beam isocenters, MOSAIQ
computes the translational shifts required to align the patient to match the anatomy in the
verification image with the anatomy in the reference image. The difference between the beam
isocenters of these images yields the computed positional shifts. (The computed positional
shifts are shifts required to move the patient so that he/she is properly aligned with respect to
the planned treatment setup.) The verification (portal) image lets you review current beam
position relative to intended position as shown on the reference (DRR or simulator) image.
CAUTION
CAUTION
In the registration process, make sure that the reference and
treatment images are in Beam's Eye View coordinates. That is, the
anatomy in the images appears as if the gantry axis is
perpendicular to the top of the image viewer and the gantry stand is
at the top of the window (gantry-up position). Use applicable caution
when you flip images to be used by the registration process. (If you
flip an image, it does not have the same effect as if you rotated the
same image 180˚.) It is your responsibility to review calculated shift
direction and magnitude before you save images. We recommend
that you make modifications if clinically necessary.
You must have Image | ViewStation | Review Images | Enable and
Image | ViewStation | Image Information | Modify security rights to
register treatment images for planar (2D) shift analysis.
Copyright 2010, Elekta Impac Software 191
LUGMSQ0002/4.0/23-Sep-2010