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Journal Article
Review
Application of Artificial Intelligence in Oncologic Molecular PET-Imaging: A Narrative Review on Beyond [ 18 F]F-FDG Tracers Part II. [ 18 F]F-FLT, [ 18 F]F-FET, [ 11 C]C-MET and Other Less-Commonly Used Radiotracers.
Seminars in Nuclear Medicine 2024 Februrary 8
Following the previous part of the narrative review on artificial intelligence (AI) applications in positron emission tomography (PET) using tracers rather than 18 F-fluorodeoxyglucose ([18 F]F-FDG), in this part we review the impact of PET-derived radiomics data on the diagnostic performance of other PET radiotracers, 18 F-O-(2-fluoroethyl)-L-tyrosine ([18 F]F-FET), 18 F-Fluorothymidine ([18 F]F-FLT) and 11 C-Methionine ([11 C]C-MET). [18 F]F-FET-PET, using an artificial amino acid taken up into upregulated tumoral cells, showed potential in lesion detection and tumor characterization, especially with its ability to reflect glioma heterogeneity. [18 F]F-FET-PET-derived textural features appeared to have the potential to reveal considerable information for accurate delineation for guiding biopsy and treatment, differentiate between low-grade and high-grade glioma and related wild-type genotypes, and distinguish pseudoprogression from true progression. In addition, models built using clinical parameters and [18 F]F-FET-PET-derived radiomics features showed acceptable results for survival stratification of glioblastoma patients. [18 F]F-FLT-PET-based characteristics also showed potential in evaluating glioma patients, correlating with Ki-67 and patient prognosis. AI-based PET-volumetry using this radiotracer as a proliferation marker also revealed promising preliminary results in terms of guide-targeting bone marrow-preserving adaptive radiation therapy. Similar to [18 F]F-FET, the other amino acid tracer which reflects cellular proliferation, [11 C]C-MET, has also shown acceptable performance in predicting tumor grade, distinguishing brain tumor recurrence from radiation necrosis, and treatment monitoring by PET-derived radiomics models. In addition, PET-derived radiomics features of various radiotracers such as [18 F]F-DOPA, [18 F]F-FACBC, [18 F]F-NaF, [68 Ga]Ga-CXCR-4 and [18 F]F-FMISO may also provide useful information for tumor characterization and predict of disease outcome. In conclusion, AI using tracers beyond [18 F]F-FDG could improve the diagnostic performance of PET-imaging for specific indications and help clinicians in their daily routine by providing features that are often not detectable by the naked eye.
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