PET - New tracers - Pharmacokinetic modelling

4 important questions on PET - New tracers - Pharmacokinetic modelling

What is the relation between metabolites and time of scanning?

Enzymes in the blood or in the liver. Shorten time, less metabolites, take in consideration when deciding for time.

Normally you take arterial blood to be able to do compartment modeling, and thus know what the supply is to the tissue. You can displace this by choosing a reference tissue, how does this work?

  1. You choose a tissue without binding sides + similar non specific uptake and clearance properties.
  2. In the reference tissue, only non specific binding will take place and free tracer distribution.
  3. You compare the uptake curves to the reference uptake curves.
  4. The volume distribution and binding potential can be estimated.

What are limitations of taking a reference tissue?

  • When there are no areas without binding sides. => then you have a pseudoreference.
  • For the brain, the reference area always should be in the brain
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What is important to take in consideration when talking about binding in different people?

  • People with a certain phenotype can have another kinetic/binding
  • Age, BMI and sex also determine binding.
  • This can influence your results so, do genetic testing and leave these patients out

The question on the page originate from the summary of the following study material:

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