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Pulmonary Tuberculosis IV01:26

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Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
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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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Radiological investigations are paramount in the diagnosis and management of various pulmonary diseases. Two essential investigations are the Pulmonary Angiogram and the Positron Emission Tomography (PET) Scan.
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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
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Updated: Jul 26, 2025

Analysis of 18FDG PET/CT Imaging as a Tool for Studying Mycobacterium tuberculosis Infection and Treatment in Non-human Primates
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Distributable, Metabolic PET Reporting of Tuberculosis.

R M Naseer Khan1, Yong-Mo Ahn2, Gwendolyn A Marriner2

  • 1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK.

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A novel PET tracer, 2-[18F]fluoro-2-deoxytrehalose ([18F]FDT), specifically images Mycobacterium tuberculosis (Mtb) lesions. This breakthrough offers a new tool for diagnosing tuberculosis (TB) and monitoring treatment efficacy.

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Area of Science:

  • Biomedical Imaging
  • Radiochemistry
  • Infectious Diseases

Background:

  • Tuberculosis (TB) diagnosis and monitoring are challenged by lengthy treatment and limited detection methods like sputum culture.
  • Current imaging agents like [18F]FDG lack specificity for Mycobacterium tuberculosis (Mtb) and do not reflect pathogen viability.
  • There is a critical need for a specific, non-invasive diagnostic tool for TB.

Approach:

  • Developed 2-[18F]fluoro-2-deoxytrehalose ([18F]FDT), a positron-emitting mimic of the Mtb disaccharide trehalose.
  • Utilized [18F]FDT as a mechanism-based enzyme reporter for in vivo imaging of Mtb.
  • Demonstrated successful imaging of Mtb lesions and treatment effects in diverse disease models, including non-human primates.

Key Points:

  • [18F]FDT leverages Mtb-specific trehalose processing for targeted imaging of bacterial lesions.
  • A direct, enzyme-catalyzed synthesis produces pyrogen-free [18F]FDT from readily available [18F]FDG.
  • Pre-clinical validation establishes [18F]FDT as a promising bacterium-specific diagnostic candidate.

Conclusions:

  • [18F]FDT enables specific imaging of TB lesions and monitoring of treatment response.
  • The synthesis method allows for accessible production of clinical-grade [18F]FDT from [18F]FDG.
  • This technology has the potential to democratize access to a TB-specific PET tracer globally.