2024/12/03 by L. P. Zhou, Changsheng Fang, Zhou, Li +11 · 1 citation
Medicine · Engineering · Physics and Astronomy · #Medical Imaging Techniques and Applications #Advanced X-ray and CT Imaging #Advanced X-ray Imaging Techniques
paper · pdf · doi:10.48550/arxiv.2412.05322
This paper introduces ρ-NeRF, a self-supervised approach that sets a new standard in novel view synthesis (NVS) and computed tomography (CT) reconstruction by modeling a continuous volumetric radiance field enriched with physics-based attenuation priors. The ρ-NeRF represents a three-dimensional (3D) volume through a fully-connected neural network that takes a single continuous four-dimensional (4D) coordinate, spatial location (x, y, z) and an initialized attenuation value (ρ), and outputs the attenuation coefficient at that position. By querying these 4D coordinates along X-ray paths, the classic forward projection technique is applied to integrate attenuation data across the 3D space. By matching and refining pre-initialized attenuation values derived from traditional reconstruction algorithms like Feldkamp-Davis-Kress algorithm (FDK) or conjugate gradient least squares (CGLS), the enriched schema delivers superior fidelity in both projection synthesis and image recognition.