ABSTRACT
While early attempts at MV CBCT produced images of
limited quality (22,26), the utilization of amorphous
silicon detectors has advanced the method significantly.
The quality of the images produced with these systems has
many of the features outlined above for the kV systems
(Fig. 3). While the fundamental limitations on noise per
unit imaging dose will limit soft tissue visualization, the
use of the MV beam should reduce the magnitude of
scatter (27,28) and may mitigate some of the artifacts
arising from detector nonlinearities and beam-hardening
effects. The reduction in these effects may offset some of
the fundamental noise constraints associated with the use
of the megavoltage-range X-rays.
