Abstract
The radiation diagnosis is expected to bear an important role in the evaluation of the chemoradiation therapy (CRT) for head and neck cancers; however, the current ability of radiation diagnosis is not satisfied the demands from clinical doctors. In this article, the author will discuss about the problems of response evaluation criteria in solid tumor (RECIST), which is now becoming to be considered as a global standard when this criteria is indicated for the evaluation of head and neck cancers. The author will also mention about the role of CT and MRI in the management strategy of head and neck cancers in which CRT is indicated, especially, the low effectiveness of contrast enhanced CT after CRT. In the last part of this article, the author will introduce MR spectroscopy and diffusion weighted imaging which are new evaluation modalities of MRI and are expected to be useful for early effect prediction of CRT.
