The utility of multimodality imaging with CT and MRI in defining rectal tumour volumes for radiotherapy treatment planning: a pilot study

Aims: This study compares the volumetric and spatial relationships of gross tumour volume (GTV) derived from CT (CT‐GTV) and GTV derived from MRI (MR‐GTV) to determine the utility of multi‐modality imaging for radiotherapy treatment planning in rectal cancer.

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