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Patient dose due to IGRT
•
Difficult to synthesize a complete picture of the patient’s
exposure:
Imaging modalities range from
planar portal images
to
fluoroscopy to
CT-based solutions
.
Procedures can be as simple as acquiring
single set-up images
or
as complex as assessment of
intra-fraction target tracking
.
Patient dose can be concentrated on the
skin
(planar kV x-ray
imaging) or distributes throughout the anatomical
volume
of
interest (CT-based)
High
image quality
versus
necessary information
has an impact
on settings and dose