Feasibility Verification of Radiation-Free Renal Volumetry: A Magnetic Navigation Ultrasound Simulation Framework with Enhanced Point Cloud Completion

This study validates the technical feasibility of three-dimensional kidney reconstruction and volumetric quantification using a single ultrasound modality through magnetic navigation simulation and hierarchical point cloud completion. By synthesizing sparse ultrasound-like sampling data (5 points/cm ) derived from the KiTS21 CT dataset, our enhanced Morphing and Sampling Network (MSN) achieves a 3.618% volumetric error relative to CT ground truth via tetrahedral reconstruction, while reducing processing time to 30 seconds per case (98.4% faster than conventional rotating probe systems). The framework demonstrates robust performance in resolving complex anatomical structures under simulated sparse sampling conditions, providing theoretical foundations for radiation-free renal volumetry. This proof-of-concept work establishes core computational principles for ultrasound-based 3D kidney modeling, prioritizing accuracy and efficiency in radiationsensitive clinical applications.