Which radiotracer besides 15O-water is used to assess blood flow or perfusion in PET?

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Multiple Choice

Which radiotracer besides 15O-water is used to assess blood flow or perfusion in PET?

Explanation:
Perfusion imaging with PET relies on tracers that reflect blood flow by moving quickly from blood into tissue and becoming trapped, so the signal corresponds to how much blood is reaching a region. 13N-ammonia fits this pattern: it is highly lipophilic and crosses cell membranes rapidly; in tissue like the heart it is taken up in proportion to perfusion and is effectively trapped after metabolism, allowing quantitative imaging of regional blood flow. This makes it a standard alternative to 15O-water for assessing perfusion. In contrast, 18F-FDG tracks glucose metabolism rather than flow, 11C-acetate mainly informs on myocardial metabolic turnover, and although others exist, 13N-ammonia is the classic perfusion tracer used alongside 15O-water.

Perfusion imaging with PET relies on tracers that reflect blood flow by moving quickly from blood into tissue and becoming trapped, so the signal corresponds to how much blood is reaching a region. 13N-ammonia fits this pattern: it is highly lipophilic and crosses cell membranes rapidly; in tissue like the heart it is taken up in proportion to perfusion and is effectively trapped after metabolism, allowing quantitative imaging of regional blood flow. This makes it a standard alternative to 15O-water for assessing perfusion. In contrast, 18F-FDG tracks glucose metabolism rather than flow, 11C-acetate mainly informs on myocardial metabolic turnover, and although others exist, 13N-ammonia is the classic perfusion tracer used alongside 15O-water.

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