During radiotherapy, only a dedicated head and neck PET acquisition was performed with an accompanying contrast-enhanced CT component using the same PET and CT imaging parameters detailed above.
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Using the combined information from a dedicated head and neck PET-CT study likely provides more accurate information on the true tumour extent [ 19].
There was an average interval of 115 days between head imaging and PET-CT, ranging from 1 day to up to 2 years.
For the head and neck area, PET acquisition parameters can be changed as follows: 6 12 min bed time, 256 PET matrix, 6 iterations, 4 subsets, 1.82-mm pixel size [11].
The model described here works well for FLT PET head-and-neck images, from which TACs can be obtained for regions containing the carotid artery.
Since our study also included patients with second primary cancer of the colorectum and head and neck, FDG PET might also be useful in patients with synchronous cancers of other organs in whom a diagnosis of metastasis or second primary cancer has yet to be made.
After evaluation and tagging by the two readers, a third physician with 8 years experience in head and neck MRI and PET identified all tagged lesions on both modalities and identified those lesions that were detected on one modality but were missed on the other modality.
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