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AJNR - American Journal of Neuroradiology

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Brain Fluorine-18 Fluorodeoxyglucose Imaging with Dual-Head Coincidence Gamma Camera:Comparison with Dedicated Ring-Detector PositronEmission Tomography

Kazuki Fukuchi^a, Kohei Hayashida^,a, Hiroshi Moriwaki^a, Kazuhito Fukushima^a, Norihiko Kume^a, Tetsuro Katafuchi^a, Masayoshi Sago^a, Makoto Takamiya^a and Yoshio Ishida^a

^a From the Departments of Radiology (K.Fukuc., K.H., K.Fukus., N.K., T.K., M.S., M.T., Y.I.) and Internal Medicine (H.M.), National Cardiovascular Center, Osaka, Japan.

View larger version (103K): [in a new window]   FIG 1. Comparison of FDG images obtained from a healthy volunteer using dedicated ring-detector PET (dr-PET) (upper panel) and a dual-head coincidence gamma camera (DHC) (lower panel). Both sets of images clearly show brain FDG distribution, but the contrast with DHC was lower than that with dr-PET. FDG uptake in the frontal lobe was relatively higher with DHC as compared with that of dr-PET

View larger version (99K): [in a new window]   FIG 2. 59-year-old man with Alzheimer-type dementia. Dedicated ring-detector PET (dr-PET) images (upper panel) show reduced uptake in both temporoparieto-occipital regions with no other sites of reduced uptake. Dual-head coincidence gamma camera images (lower panel) show reduced uptake in bilateral temporoparieto-occipital regions as well as the dr-PET images do

View larger version (78K): [in a new window]   FIG 3. 71-year-old man with post-traumatic epilepsy. Dedicated ring-detector PET images (upper panel) show multiple lesions of increased FDG accumulation in the right cerebral cortices and basal ganglia. Dual-head coincidence gamma camera images (lower panel) also show multiple lesions of increased FDG accumulation

View larger version (29K): [in a new window]   FIG 4. Comparison of FDG uptake ratios between dual-head coincidence gamma camera (DHC) imaging and dedicated ring-detector PET (dr-PET) in 252 regions of 21 subjects. The cerebrum/cerebellum ratio in DHC imaging revealed a close relationship with that of dr-PET.