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Figure 10. Exclusive ¹⁹F resonance arising from the gallbladder of an individual receiving protracted venous infusion of 5-fluorouracil (5FU). This example demonstrates a half Fourier single-shot turbo spin echo (HASTE) image of the upper abdomen with the ¹⁹F chemical shift imaging (CSI) grid overlain. The high signal intensity structure in the middle left grid is the gallbladder. In CSI, signals are acquired from each of the grids. Note the absence of a ¹⁹F resonance from the liver. The methodological set-up allowed the accurate determination of the resonant frequency of a particular chemical ¹⁹F species. We now believe the gallbladder resonance is due to bile acid conjugated -fluoro--alanine. Reproduced with permission, John Wiley & Sons, Inc [39].

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