Fluorodeoxyglucoses

Retention, too, is highly tissue-specific. Sometimes, the extraction mechanism is also the retention mechanism, as for Tc-sestamibi, which is retained in mitochondria as long as transmembrane potentials remain intact. Others are separate. F-2-Fluorodeoxyglucose enters the cell by the same pathway as glucose, but is trapped because it is not a substrate for hexokinase, preventing further intracellular metabohsm. 

Dozens of compounds have been used in in vivo fluonne NMR and MRI studies, chosen more for their commercial availability and established biochemistry than for ease of fluonne signal detection [244] Among the more common of these are halothane and other fluormated anesthetics [245, 246], fluorodeoxyglucose [242 243], and perfluormated synthetic blood substitutes, such as Fluosol [246], a mixture of perfluorotnpropylamine and perfluorodecahn Results have been Imut-ed by chemical shift effects (multiple signals spread over a wide spectral range) and long acquisition times... 

PET scans with 18F-fluorodeoxyglucose (18F-FDG) have an established role in the localization of epileptic foci in patients being evaluated for epilepsy surgery. 

The main radiopharmaceuticals labelled with fluorine-18, routinely prepared ([2-i F] fluorodeoxyglucose [ F]FDG [26-28], [i F]fluoro-L-DOPA [29], [i F]altanserin [30, 31], [ F]setoperone [32]) are presented with their uses in Table 2. For comparison, the most common tracers labelled with carbon-11 (methionine [33], palmitic acid [34], flumazenil (RO 15.1788) [35], PK 11195 [36], raclopride [37], deprenyl [38], Way-100635 [39], McN-5652Z [40], CGP 12177 [41]) are shown in Table 3. By far, [ F]FDG is the most widely studied, particularly in oncology for the diagnosis of tumours, detection of sub-clinical diseases, assessment of therapy responses, and detection of recurrence. F-Steroids [42], F-proteins or peptides, or F-labelled tissue specific agents have also been synthesized for the detection and monitoring of various malignancies [43]. 

F]p2 addition on the double bond of triacetoxyglucal [26], followed by deprotection of the acetate functions (Scheme 5), was the first method used to produce [2- F]fluorodeoxyglucose. About 10% of [ F]fluorodeoxymannose (FDM) were also formed in the reaction (Scheme 5). 

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