Software Products for the Radiological Sciences
Image Guided Radiation Therapy
Images taken on EPID at plus and minus 30 degrees for treatment of the
prostate with a 0.075 cm diameter linear marker.
Same images processed to enhance edges. Shown also are the markers
projected from the CT scan space (gold) unto the radiographs.
One of two methods to solve for the couch shift: Trace
the markers on the radiographs (red). Traces from the
prior day could also be dragged for the same.
The couch shift is solved for with a least squares distance
between the traced markers (red) and the markers projected
onto the radiographs (gold) found from the CT scans. Alternately
the couch isocenter can be dragged between the two radiographic
planes to get the same match.
The couch move is now computed along with the final positions
of the treatment beams.
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