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Fig. 2 | EJNMMI Research

Fig. 2

From: Voxel-based identification of local recurrence sub-regions from pre-treatment PET/CT for locally advanced head and neck cancers

Fig. 2

Intra-individual differences that can be found in CT images acquired at different time points. Left: pre-treatment CT. Right: post-treatment CT. a Red arrow: changes of patient anatomy after the treatment. Blue arrow: intensity differences due to the injection of a contrast agent in the post-treatment CT (right). b Differences in the position of the patient between pre- and post-treatment CT. Here, the inclination of the head has changed

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