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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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Related Experiment Video

Updated: Sep 28, 2025

Radiosynthesis, Quality Control, and Small Animal Positron Emission Tomography Imaging of 68Ga-Labelled Nano Molecules
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Simultaneous visualization of multiple radionuclides in vivo.

Atsushi Yagishita1,2, Shin'ichiro Takeda3, Miho Katsuragawa4

  • 1Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, Kashiwa, Japan. yagisitta@g.ecc.u-tokyo.ac.jp.

Nature Biomedical Engineering
|April 5, 2022
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Summary

This study introduces a new cadmium telluride diode detector for radionuclide imaging, improving visualization of multiple isotopes and fine tissue structures. The advanced system enables simultaneous imaging of three different radionuclides in mice for biomedical applications.

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Biophysics

Background:

  • Conventional scintillation detectors have limited energy and spatial resolution.
  • This limitation restricts the visualization of multiple radionuclides and microstructures in tissue.

Purpose of the Study:

  • To develop and evaluate a novel imaging system with a cadmium telluride diode detector.
  • To achieve high energy and spatial resolution for improved radionuclide imaging.

Main Methods:

  • Developed a cadmium telluride diode detector-based imaging system.
  • Utilized high-resolution spectra fitted to an X-ray analysis model.
  • Administered iodine-125, indium-111, and technetium-99m to mice for simultaneous imaging.

Main Results:

  • Achieved an energy resolution of 1.7% at 140 keV and spatial resolution of 250 μm.
  • Accurately determined individual radiation activities from three radionuclides.
  • Successfully visualized thyroid tissue, mandibular lymph nodes, and parotid lymph nodes simultaneously in mice.

Conclusions:

  • The developed cadmium telluride diode detector system significantly enhances radionuclide imaging capabilities.
  • High-resolution multi-radionuclide imaging offers promising applications in biomedical research and diagnostics.