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Related Concept Videos

Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Related Experiment Video

Updated: Apr 23, 2026

Radiotracer Administration for High Temporal Resolution Positron Emission Tomography of the Human Brain: Application to FDG-fPET
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A philosophy for CNS radiotracer design.

Genevieve C Van de Bittner1, Emily L Ricq, Jacob M Hooker

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School , Charlestown, Massachusetts 02129, United States.

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Developing new positron emission tomography (PET) radiotracers is crucial for advancing neuroimaging. This account outlines key strategies and challenges in creating novel CNS radiotracers for human brain imaging.

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Area of Science:

  • Neuroscience
  • Radiochemistry
  • Medical Imaging

Background:

  • Positron emission tomography (PET) is a leading technique for in vivo neurochemistry imaging in humans.
  • Technological advancements and new radiotracer development have expanded PET's applications.
  • Currently, fewer than 40 human central nervous system (CNS) proteins are targetable by PET imaging, highlighting a critical need for new radiotracers.

Purpose of the Study:

  • To detail the essential decisions, strategies, and potential pitfalls in developing novel CNS radiotracers for human imaging.
  • To provide insights based on practical experience in CNS radiotracer development.
  • To address the unmet need for imaging a broader range of CNS proteins.

Main Methods:

  • Discusses five key components: biomedical question selection, biological target identification, radiotracer chemical structure design, candidate evaluation, and preclinical imaging analysis.
  • Emphasizes market analysis for potential users and selection of relevant biomedical questions.
  • Covers target localization, density, affinity, and test-retest variability requirements for binding-based tracers.
  • Highlights high-throughput, modular synthesis for late-stage radioisotope installation to manage isotope half-lives.
  • Details methods for evaluating brain uptake, including bioavailability, blood-brain barrier (BBB) permeability, non-specific binding, and metabolic stability.
  • Includes high-throughput affinity assays, specific binding analysis, and kinetic assessment.
  • Describes initial preclinical assessment using brain uptake, specific binding, and kinetic analysis.

Main Results:

  • The development process involves iterative and non-linear application of the five key components.
  • Successful radiotracer development requires careful consideration of target characteristics and tracer properties.
  • Preclinical assessments guide the selection of promising candidates for human imaging.

Conclusions:

  • A systematic yet flexible approach to radiotracer development is essential for efficiently creating new PET agents.
  • Addressing the identified components iteratively can accelerate the discovery of novel PET radiotracers for CNS targets.
  • This framework aims to expand the repertoire of molecular targets visualized in the human brain using PET.