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Positron Emission Tomography

Positron Emission Tomography

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 being...

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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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Updated: Jul 13, 2026

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space

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Published on: February 1, 2016

A GSO positron/single-photon imaging detector.

Seiichi Yamamoto¹, Keiichi Matsumoto, Setsu Skamoto

¹Kobe City College of Technology, Kobe, Japan.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)

|July 25, 2007

Summary

A new gamma detector using GSO crystals was developed for breast cancer imaging. This technology enables imaging of both positron and single-photon radionuclides for enhanced diagnostic capabilities.

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Published on: January 30, 2020

Area of Science:

Medical Physics
Nuclear Medicine
Radiological Imaging

Background:

Positron Emission Tomography (PET) and single-photon imaging are crucial for diagnosing conditions like breast cancer and identifying sentinel lymph nodes.
Existing imaging technologies face limitations in energy resolution and suitability for specific radionuclide types.

Purpose of the Study:

To develop and evaluate a novel gamma detector utilizing Gadolinium-based scintillator (GSO) crystals for improved medical imaging.
To assess the detector's efficacy in imaging both positron-emitting and low-energy single-photon emitting radionuclides.

Main Methods:

The imaging detector was constructed using a GSO crystal block coupled to a 2-inch square multichannel position-sensitive photomultiplier tube (PSPMT) and associated electronics.
Positron imaging was performed by measuring coincidence detection between the GSO detector and a single gamma probe.
Single-photon imaging involved mounting a tungsten collimator in front of the GSO detector.

Main Results:

The developed GSO position-sensitive gamma detector demonstrated successful imaging capabilities for both positron radionuclides and low-energy single-photon radionuclides.
The detector exhibits good energy resolution for annihilation gammas and low-energy photons, making it suitable for diverse imaging applications.
The system configuration allowed for effective imaging of target radionuclides relevant to breast cancer and sentinel lymph node detection.

Conclusions:

The GSO position-sensitive gamma detector represents a promising advancement in nuclear medicine imaging.
Its versatility in imaging different types of radionuclides offers potential for enhanced diagnostic accuracy in oncology.
Further research and clinical validation are warranted to fully explore the clinical utility of this GSO-based imaging system.