2017_IGRT course book

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