A high resolution permanent magnet MPI device

Abstract

Magnetic particle imaging (MPI) is a novel emerging tomographic technique with high resolution and high sensitivity.Typically, the magnetic fields of MPI scanners are generated  electromagnetically, resulting in an immense power consumption and making it difficult to apply in clinical research. The MPI device based on Halbach array provide a new solution. In this device, a mechanically driven scanning MPI device was designed using a Halbach permanent magnet array. The device consists of four layers of Halbach arrays, and is ultimately capable of achieving a FOV of 70mmdiameter, and a resolution better than 0.5mm. Compared with the previous Halbach permanent magnet MPI device, this device generates three dimensions of gradients that can be used for 3D imaging. Moreover, the stability of the structure was analyzed by structural mechanics calculations and magnetic field error simulations, and the feasibility of the device was analyzed by simulations of the system scan trajectory and image reconstruction.