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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.
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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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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Related Experiment Video

Updated: Feb 28, 2026

PET and MRI Guided Irradiation of a Glioblastoma Rat Model Using a Micro-irradiator
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18F-FDG PET-CT- vs. CT-Based Radiotherapy Treatment Planning for Head and Neck Cancer.

Admir Mulita1, Eleni Bekou2, Pipitsa Valsamaki3

  • 1Department of Radiotherapy/Oncology, School of Medicine, Democritus University of Thrace, 68100 Alexandroupolis, Greece.

Life (Basel, Switzerland)
|February 27, 2026
PubMed
Summary

Fluorine-18-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) significantly improves tumor delineation and staging for head and neck squamous cell carcinoma (HNSCC) patients undergoing radiotherapy. This enhanced imaging allows for more precise radiation planning, potentially improving treatment outcomes.

Keywords:
PET/CThead–neck cancerplanningradiotherapystaging

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Area of Science:

  • Oncology
  • Radiotherapy
  • Medical Imaging

Background:

  • Precise staging and tumor delineation are critical for effective radiotherapy (RT) in head and neck squamous cell carcinoma (HNSCC).
  • Computed tomography (CT)-based RT is standard, but 18F-FDG PET/CT offers superior detection of primary and nodal disease.

Purpose of the Study:

  • To investigate the impact of 18F-FDG PET/CT on RT planning for HNSCC patients.
  • To compare RT plans generated using CT-only versus PET/CT data.

Main Methods:

  • A prospective study of 51 HNSCC patients receiving radical volumetric modulated arc RT with cisplatin.
  • Two RT plans were created per patient: one using CT-only data and another using PET/CT data.
  • Planning target volumes (PTVs) and dose-volume histograms were analyzed and compared.

Main Results:

  • PET/CT altered TNM staging in 11.8% (T-stage) and 33.3% (N-stage) of patients.
  • Distant metastases were identified in 9.8% of patients, influencing treatment policy.
  • PET/CT planning improved primary tumor PTV coverage (PTV4) in 37.2% of cases and nodal PTV (PTV2) adjustments in 33.3% of patients, with significantly better dose delivery to target volumes.

Conclusions:

  • 18F-FDG PET/CT enhances target delineation for primary tumors and lymph nodes in HNSCC.
  • PET/CT facilitates dose escalation in metabolically active lesions and identifies occult distant metastases.
  • The integration of PET/CT enables more personalized and potentially more effective RT strategies for HNSCC.