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Overview
Which technology to choose?
Consider the following:
Whether using ionising radiation, or a non ionising method is appropriate.
Is a 2D adequate, or is a 3D method required?
Is the purpose to measure inter-fraction or intra-fraction motion?
Can the target be seen directly, or is a surrogate to be used?
Considerations about the concomitant imaging dose.
IGRT technologies
2D imaging and implanted markers
3D/Volumetric imaging
4D/Tracking
Non-radiographic imaging: Ultrasound, Surface sensing, Implanted radio-
emitters