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B Domenech Brasero1, A Mestre-Fusco2, M Suárez Piñera3

  • 1Servicio de Medicina Nuclear, Hospital Quirónsalud Barcelona, Barcelona, España.

Revista Espanola De Medicina Nuclear E Imagen Molecular
|January 3, 2021
PubMed
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Brain 18F-DOPA PET/CT aids in diagnosing brain lesions when MRI is inconclusive. This imaging technique significantly impacts patient management by altering treatment plans.

Area of Science:

  • Neuroimaging
  • Nuclear Medicine
  • Oncology

Background:

  • Magnetic Resonance Imaging (MRI) can yield inconclusive results in the differential diagnosis of brain lesions.
  • Accurate diagnosis is crucial for effective patient management and treatment planning.

Purpose of the Study:

  • To evaluate the diagnostic utility of fluorine-18-DOPA Positron Emission Tomography/Computed Tomography (18F-DOPA PET/CT) in cases of brain lesions with indeterminate MRI findings.
  • To assess the impact of 18F-DOPA PET/CT on patient treatment decisions.

Main Methods:

  • A study involving 12 patients with 16 brain lesions that were not definitively diagnosed by MRI.
  • Dual-point 18F-DOPA PET/CT scans were performed with acquisitions at 20 and 90 minutes.
  • Visual assessment and semiquantitative analysis including SUVmax, Tumor-to-Striatum (T/S) ratio, and Tumor-to-Normal parenchyma (T/N) ratio were calculated.
Keywords:
(18)F-DOPABrain metastasesGliomaMetástasis cerebralPET/CTPET/TCRecidiva tumoralTumoral recurrence

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Main Results:

  • 18F-DOPA PET/CT demonstrated high sensitivity and specificity, particularly using the T/S ratio (90% sensitivity, 100% specificity) for malignancy detection.
  • Visual assessment showed 100% sensitivity but lower specificity (33.3%).
  • The imaging findings led to a modification of treatment in 75% of the patients, with no added diagnostic value from late-phase imaging.

Conclusions:

  • 18F-DOPA PET/CT is a valuable tool for the differential diagnosis of brain lesions when MRI results are inconclusive.
  • Late-phase imaging does not enhance diagnostic accuracy.
  • The integration of 18F-DOPA PET/CT findings significantly influences therapeutic strategies in neuro-oncology.