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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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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.
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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
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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.
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Isotopes and Radioisotopes01:28

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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
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Related Experiment Video

Updated: Dec 7, 2025

Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules
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Dealing with PET radiometabolites.

Krishna Kanta Ghosh1, Parasuraman Padmanabhan2, Chang-Tong Yang1,3,4

  • 1Lee Kong Chian School of Medicine, Nanyang Technological University Singapore, 59 Nanyang Drive, Singapore, 636921, Singapore.

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Summary

Understanding radiometabolite identification is crucial for accurate Positron Emission Tomography (PET) imaging. This review details radiometabolite identities and emphasizes how chemical modifications can improve PET tracer reliability.

Keywords:
HPLCHPLC-MSPETRadiometabolitesRadiotracer

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Solid Phase 11C-Methylation, Purification and Formulation for the Production of PET Tracers
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Area of Science:

  • Radiopharmaceutical chemistry
  • Molecular imaging
  • Biochemistry

Background:

  • Positron Emission Tomography (PET) relies on radiotracers to study biological functions.
  • Radiotracers undergo biotransformation in vivo, forming radiometabolites.
  • PET signal reflects total radioactivity, not parent radiotracer concentration, complicating interpretation.

Purpose of the Study:

  • To summarize the chemical and structural identity of radiometabolites for key PET tracers.
  • To underscore the importance of radiometabolite analysis in PET imaging.
  • To explore how chemical modifications can mitigate radiometabolite interference.

Main Methods:

  • Review of existing literature on PET radiometabolites.
  • Analysis of chemical structures and biotransformation pathways of specific radiotracers ([11C]PBB3, [11C]flumazenil, [18F]FEPE2I, [11C]PBR28, [11C]MADAM, (+)[18F]flubatine).
  • Discussion of radiometabolite analysis techniques and their impact on PET data.

Main Results:

  • Detailed identification of radiometabolites for several commonly used PET tracers.
  • Demonstration that radiometabolites can have different biodistribution patterns than the parent tracer.
  • Highlighting the potential of minor chemical modifications to reduce problematic radiometabolite formation.

Conclusions:

  • Accurate quantification of parent radiotracers is vital for reliable PET imaging.
  • Understanding radiometabolite profiles is essential for interpreting PET scans and developing new tracers.
  • Strategic chemical modifications of PET tracers can enhance imaging accuracy by minimizing radiometabolite interference.