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Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

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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 Tomography01:29

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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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Radiological Investigation III: Pulmonary Angiogram and PET Scan01:13

Radiological Investigation III: Pulmonary Angiogram and PET Scan

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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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A Pulmonary Angiogram is an invasive procedure involving injecting a contrast medium through a catheter threaded into the pulmonary artery or the right side of the heart to visualize the pulmonary vasculature. Computed Tomography (CT) scans have mainly replaced this...
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Related Experiment Video

Updated: Apr 15, 2026

Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules
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Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules

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25 Years of "Loop" Radiochemistry for PET Imaging.

Emily Murrell1,2, Sahil Khan1, Neil Vasdev1,2

  • 1Azrieli Centre for Neuro-Radiochemistry, Brain Health Imaging Centre, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada.

Journal of Labelled Compounds & Radiopharmaceuticals
|April 14, 2026
PubMed
Summary
This summary is machine-generated.

The loop method offers a cleaner, more efficient alternative to traditional vial-based synthesis for producing radiopharmaceuticals. This perspective reviews its development, advantages, and applications in PET imaging and organic chemistry.

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Enhancing Efficiency and Radiolabeling Yields of Carbon-11 Radioligands for Clinical Research Using the Loop Method
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Area of Science:

  • Radiochemistry
  • Organic Chemistry
  • Nuclear Medicine

Background:

  • Conventional radiopharmaceutical synthesis relies on vial-based methods.
  • The loop method emerged as a more modern, efficient, and cleaner approach over the last 25 years.

Purpose of the Study:

  • To provide a historical overview of the loop radiochemistry method's development.
  • To highlight the advantages of the loop method compared to other synthesis approaches.
  • To discuss its applications in synthesizing 11C- and 18F-labelled compounds for PET imaging and organic chemistry.

Main Methods:

  • Review of historical development of loop radiochemistry.
  • Analysis of advantages and applications of the loop method.
  • Exploration of its expansion into diverse organic reactions.

Main Results:

  • The loop method offers significant advantages in efficiency and cleanliness for radiopharmaceutical synthesis.
  • It has been successfully applied to the synthesis of 11C- and 18F-labelled compounds for PET imaging.
  • The method's utility has expanded to various organic chemistry reactions.

Conclusions:

  • The loop method represents a significant advancement in radiochemistry.
  • Its efficiency and versatility make it a valuable tool for PET imaging and broader organic synthesis.
  • Future developments are anticipated to further enhance its capabilities.