Molecular Imaging of Tuberculosis.

Area of Science:

• Medical Imaging
• Infectious Diseases
• Molecular Biology

Background:

• Tuberculosis (TB) remains a significant global infectious disease, necessitating sustained control efforts and innovative diagnostic/treatment assessment methods.
• Molecular imaging utilizes radioactive probes for visualizing molecular targets in disease, offering both anatomical and functional insights.
• Fluorine-18 fluorodeoxyglucose (FDG) PET/CT is a key molecular imaging technique investigated for TB diagnosis and treatment response assessment.

Purpose of the Study:

• To evaluate the utility of FDG PET/CT in predicting TB treatment outcomes and identifying patients at risk of relapse.
• To explore the potential of novel molecular imaging probes targeting specific components of TB lesions for improved management.
• To investigate the application of radiolabeled anti-TB drugs for non-invasive pharmacokinetic studies and treatment monitoring.

Main Methods:

• Positron emission tomography/computed tomography (PET/CT) imaging using FDG as a radioactive probe.
• Assessment of treatment response by comparing FDG PET/CT findings with sputum conversion.
• Development and evaluation of novel PET probes targeting TB granuloma characteristics (hypoxia, neovascularization, fibrosis) and radiolabeled anti-TB drugs.

Main Results:

• FDG PET/CT demonstrates superior performance over sputum conversion in predicting TB treatment outcomes.
• FDG PET/CT can identify patients considered cured by standard criteria who still harbor viable bacilli and are at risk of relapse.
• Novel probes targeting TB granuloma components and radiolabeled drugs show promise for advanced TB research and clinical application.

Conclusions:

• FDG PET/CT is a valuable tool for predicting TB treatment success and identifying relapse risk, improving upon current standards.
• Ongoing research into novel molecular imaging probes and radiolabeled drugs is crucial for advancing TB diagnosis, treatment monitoring, and understanding drug pharmacokinetics.
• Molecular imaging significantly enhances our understanding of TB pathogenesis and evolution, paving the way for more personalized and effective TB management strategies.