This study looked at PET imaging with FDG both under TSH suppression and TSH stimulation. The authors found that out of the 10 patients studied, that in 3 of the 10 TSH stimulation led to greater diagnostic sensitivity.

Influence of Thyroid-Stimulating Hormone Levels on Uptake of FDG in Recurrent and Metastatic Differentiated Thyroid Carcinoma

Florian Moog, Rainer Linke, Niklas Manthey, Reinhold Tiling, Peter Knesewitsch, Klaus Tatsch and Klaus Hahn

Klinik und Poliklinik für Nuklearmedizin der Ludwig-Maximilians-Universität München, München, Germany

http://jnm.snmjournals.org/cgi/cont...ract/41/12/1989

Journal of Nuclear Medicine Vol. 41 No. 12 1989-1995