This routine was originally developed for use at UCLA Medical Center to implement the UCLA IMRT Protocol, but can be used with any TPS that outputs a 2-D dose map. It also conforms to the Memorial Sloan Kettering IMRT Protocol. This routine registers two CT Scout views to determine patient movement relative to a fixed coordinate system. The registration corrects for shifts, rotations or magnification differences. Once images are the same size and orientation, image can be compared via differencing, using a method similar to digital subtraction angiography, or with an overlay technique in which each image is displayed in a different color.
Image registration is accomplished by defining a set of control points that are in both images.
This routine is very useful for verifying patient position for advanced treatments.