Medical Imaging and Radiotherapy Planning

Effects of organ, tumour, and patient movements (correct)

Subclinical disease

Inaccuracies in beam and patient set-up

Anatomy of the patient

To compensate for the effects of organ, tumour, and patient movements

To specify the margins around the CTV for planning target volume (PTV) definition

To incorporate the GTV and/or subclinical disease into the clinical target volume (CTV) (correct)

To define the target volume based on the patient's anatomy

Margins added around the CTV

Gross tumour volume (GTV) and subclinical disease (correct)

Inaccuracies in beam and patient set-up

Anatomy of the patient

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