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Related Concept Videos

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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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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: Mar 16, 2026

Establishment of a Simple and Effective Rat Model for Intraoperative Parathyroid Gland Imaging
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(18)F-FET-PET in Primary Hyperparathyroidism: A Pilot Study.

Martin Krakauer1, Andreas Kjaer2, Finn N Bennedbæk3

  • 1Department of Clinical Physiology and Nuclear Medicine, Gentofte Hospital, DK-2900 Hellerup, Denmark. martin.krakauer@regionh.dk.

Diagnostics (Basel, Switzerland)
|August 23, 2016
PubMed
Summary

Fluoroethyl-l-tyrosine (FET) positron emission tomography (PET) was evaluated for preoperative localization of parathyroid adenomas in primary hyperparathyroidism (PHP). The study found FET PET/CT unsuitable for this purpose due to insufficient target-to-background ratios for confident adenoma visualization.

Keywords:
">l-tyrosine(18F)fluoroethyl-positron-emission tomographyprimary hyperparathyroidism

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Area of Science:

  • Nuclear Medicine
  • Radiochemistry
  • Endocrinology

Background:

  • Preoperative localization of parathyroid glands is crucial for minimally invasive surgery in primary hyperparathyroidism (PHP).
  • Conventional sestamibi scintigraphy is standard, but novel positron emission tomography (PET) tracers like methionine and choline show promise.
  • The longer half-life of Fluorine-18 (18F) makes tracers like fluoroethyl-l-tyrosine (FET) logistically advantageous.

Purpose of the Study:

  • To evaluate the feasibility of using the 18F-based PET tracer FET for preoperative localization of parathyroid adenomas in PHP.
  • To assess the potential of FET PET/CT as an alternative imaging modality.

Main Methods:

  • A proof-of-concept study involving two patients with PHP.
  • Dual-isotope parathyroid subtraction single photon emission computed tomography (SPECT) was used for initial localization.
  • Dynamic FET PET/CT scans were performed, followed by visual evaluation and calculation of target-to-background ratios (TBR).

Main Results:

  • Maximum TBR (parathyroid vs. thyroid) was achieved around 30 minutes post-injection.
  • The maximum TBR values in the two patients were 1.5 and 1.7.
  • These TBR values were insufficient for confident visualization of the parathyroid adenomas.

Conclusions:

  • FET PET/CT appears not to be a feasible preoperative imaging modality for primary hyperparathyroidism.
  • The low target-to-background ratios limit its diagnostic utility in this context.
  • Further research into alternative PET tracers or imaging techniques may be warranted.