Simulation verification of dimensionality extension reconstruction based on field free line coding

Magnetic Particle Imaging (MPI) is an emerging imaging technology. Traditional scanning methods often use field free point (FFP) to traverse the entire imaging field of view?FOV?, or use field free line (FFL) to reconstruct images through parallel beam projection.In this study, we propose a dimensionality extension reconstruction method based on FFL line coding, this method extends the FFP along the vertical direction of its motion to form the FFL, enabling the FFR to traverse a 3D field of view during 2D scanning.This scheme enables low-dimensional scanning with high-dimensional reconstruction, which can enhance sensitivity and MPI scanning speed.This study verified the feasibility of the method through simulation experiments.