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Thyroid functional and molecular imaging.

Luca Giovanella1, Anca M Avram2, Petra Petranović Ovčariček3

  • 1Clinic for Nuclear Medicine and Molecular Imaging, Imaging Institute of Southern Switzerland, Ente Ospedaliero Cantonale, Bellinzona, Switzerland; Clinic for Nuclear Medicine, University Hospital and University of Zurich, Zurich, Switzerland.

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Summary
This summary is machine-generated.

Radioiodine uptake tests and thyroid scintigraphy evaluate thyroid function and localize issues. These molecular imaging techniques aid in diagnosing thyrotoxicosis and thyroid nodules, guiding treatment decisions.

Keywords:
Functional imagingHyperthyroidismMolecular imagingThyroidThyroid functional autonomy

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Area of Science:

  • Nuclear Medicine
  • Endocrinology
  • Radiology

Background:

  • Radioiodine uptake (RAIU) tests and Thyroid Scintigraphy (TS) are crucial for evaluating thyroid cell function and iodine kinetics.
  • These imaging modalities help differentiate causes of thyrotoxicosis, distinguishing between destructive and productive forms.
  • Ectopic thyroid tissue can also be detected and localized using these techniques.

Purpose of the Study:

  • To summarize the fundamental concepts, clinical applications, and future directions of thyroid molecular imaging.
  • To highlight the role of RAIU and TS in diagnosing and managing thyrotoxicosis and thyroid nodules.
  • To discuss the utility of specific radiopharmaceuticals in differentiating benign from malignant thyroid lesions.

Main Methods:

  • Utilizing iodine-123 (Na[123I]I), iodine-131 (Na[131I]I), and 99mTc-pertechnetate (Na[99mTc]TcO4) for RAIU tests and TS.
  • Employing radiopharmaceuticals like [99mTc]Tc-MIBI and [18F]FDG for evaluating indeterminate thyroid nodules.
  • Calculating therapeutic Na[131I]I activity for hyperthyroidism and goiter treatment based on RAIU studies.

Main Results:

  • RAIU and TS effectively differentiate causes of thyrotoxicosis based on uptake patterns (low for destructive, high for productive).
  • Scintigraphic identification of autonomously functioning thyroid nodules (AFTNs) can obviate the need for fine-needle aspiration (FNA) biopsy.
  • [99mTc]Tc-MIBI and [18F]FDG aid in characterizing "cold" nodules, potentially reducing diagnostic surgeries.

Conclusions:

  • Thyroid molecular imaging provides essential functional characterization of thyroid diseases, often before clinical manifestation.
  • RAIU and TS are integral to the management of thyrotoxicosis, thyroid nodules, and goiter.
  • Advanced molecular imaging techniques offer valuable tools for precise diagnosis and personalized treatment strategies in thyroid disorders.