Original sentence: About 75% of the fluorine-18 activity remains in tissues and is eliminated with a half-life of 110 minutes (presumably by being metabolized in-place as glucose-6-phosphate, then eliminated in carbon dioxide and water); another fraction representing about 20% of the total fluorine-18 activity of an injection is eliminated renally by two hours after a dose of FDG, with a rapid half-life of about 16 minutes (this portion makes the renal-collecting system and bladder prominant in a normal PET scan).Although in theory all FDG is metabolized as above with a radioactivty elimination half-life of 110 minutes (the same as that of fluorine-18), clinical studies have shown that the radioactivity of FDG partitions into two major fractions
Edited sentence: About 75% of the fluorine-18 activity remains in tissues and is eliminated with a half-life of 110 minutes (presumably by being metabolized in-place as glucose-6-phosphate, then eliminated in carbon dioxide and water); another fraction representing about 20% of the total fluorine-18 activity of an injection is eliminated renally by two hours after a dose of FDG, with a rapid half-life of about 16 minutes (this portion makes the renal-collecting system and bladder prominent in a normal PET scan).Although in theory all FDG is metabolized as above with a radioactivity elimination half-life of 110 minutes (the same as that of fluorine-18), clinical studies have shown that the radioactivity of FDG partitions into two major fractions