Radiopharmaceuticals

AI in Radiobiology & Radiopharmaceuticals: April 2026 Update Research Date: 2026-04-04 Category: AI-Radiobiology-Radiopharmaceutical Focus: AI-driven theranostics dosimetry, precision radiotherapy frameworks, and radiopharmaceutical discovery advances 1. AI-Enhanced Theranostics Dosimetry: Comprehensive 2025 Review A systematic review in Nuclear Medicine and Molecular Imaging (August 2025) examined deep learning applications in theranostic radiopharmaceutical dosimetry across three critical domains: image quality enhancement, dose estimation, and organ segmentation [1]. Deep Learning Architectures U-Net-based models: Primary architecture for organ segmentation, achieving Dice similarity coefficients >0.90 in benchmark challenges [1] Generative Adversarial Networks (GANs): Used for PET image synthesis and quality enhancement; Jyoti et al. achieved PSNR 32.83 and SSIM 77.48 for synthetic brain PET representing Alzheimer’s disease stages [1] Hybrid transformer networks: Emerging for multi-task dosimetry workflows combining segmentation and dose prediction [1] PET Image Synthesis Innovation Wang et al. demonstrated 3D U-Net synthesis of synaptic density (¹¹C-UCB-J) and amyloid deposition (¹¹C-PiB) PET from widely available ¹⁸F-FDG scans [1] Mean region-of-interest biases within ±2% across Alzheimer’s disease and cognitively normal groups [1] Applications: overcoming short-lived radionuclide imaging limitations, reducing radiation exposure, enabling delayed-time-point dosimetry without additional scans [1] Dosimetry Software Integrating AI QDOSE: Supports AI-based semi- and fully-automated organ segmentation, single time-point dosimetry, one-click hybrid dosimetry [1] MIM Software: Voxel-level dosimetry with AI-enhanced segmentation capabilities [1] VoxelDose, BigDose, RMDP: Additional voxel-based dosimetry packages incorporating ML components [1] Critical Challenges Identified Accurate dose estimation from theranostic pairs (diagnostic/therapeutic imaging correlation) [1] Lack of standardized imaging datasets for DL training [1] Radionuclide decay chain modeling complexity for multi-emitter isotopes [1] Need for optimization and standardization of AI models for clinical reliability [1] 2. Precision Radiotherapy Implementation Framework: Semantic AI Analysis A PMC-published study (2025) applied AI-driven semantic and temporal analysis to 3,343 unique articles (1964–2025) from Scopus, PubMed, and Web of Science, mapping radiotherapy-radiobiology-oncology evolution [2]. ...