Dosimetry for IMRT

The Same Technique Could Be Applied for
Other Small Beams
Now for a point source, the measured primary dose
would be proportional to the area of the beam and
inversely proportional to the scan velocity.
A circular beam
is scanned in a
raster pattern to
create a broad
beam using the
same overall
irradiation time.
Beam’s eye view
You would
actually scan the
phantom
instead of
scanning the
beam.