This provides a nice overview and comparison of different methods.
1. Mourtzakis M, et al., A practical and precise approach to quantification of body composition in cancer patients using computed tomography images acquired during routine care. Applied Physiology Nutrition and Metabolism 2008; 33: 997-1006.
CT imaging is rapidly becoming the gold standard for body composition in teh oncology setting. See Baracos VE for publications.
it depends on the case and the patient risk and history, it might start with just US in simple non risky patient and CT neck with contrast in suspicious cases and PET CT for evaluation in clinically cancer. MRI has role in cases of eye and brain involvement to know where is the tumour and its spread and respectability . It is large topics and depends on the case by case..
Thank you very much Vera and Nabil. I share your analysis when saying that each pathology has its preferred modality or must be approached according to a strategy involving different modalities. The document I am looking for (if existing?) is supposed to give a high level view answering a question like: Considering all cancers putted together, all diagnosis strategies, what is the importance of CT in that?