Static and Dynamic Performance of Amino Acid Positons Emission Tomography (PET) for Differentiating Radiation Necrosis From Tumor Progression in Irradiated Brain Metastases (DYNAMET)

Differentiating radiation necrosis from tumor progression in patients with brain metastases treated with radiotherapy is a major challenge in post-treatment management, as the therapeutic and prognostic implications differ substantially depending on whether the lesion represents radiation necrosis (surveillance, anti-angiogenic therapy) or tumor progression (re-initiation of local or systemic treatment).

In addition to brain MRI, amino acid PET imaging, including both static and dynamic acquisitions, is a key diagnostic tool for this purpose.

However, the added value of dynamic acquisitions remains uncertain, and the available evidence is limited to small patient series.