Development of a Compact FFL-MPI System Based on a Halbach Permanent Magnet

The high power consumption and large size of conventional Magnetic Particle Imaging (MPI) systems present significant barriers to their clinical translation. To address this challenge, we present a novel, compact MPI scanner implementation based on a Halbach permanent magnet structure. This design generates a field-free line (FFL) and achieves a gradient strength of 1.16 T/m within a 50 mm diameter bore. Experimental results demonstrate that the system successfully resolves two distinct particle points separated by 1 mm, confirming a spatial resolution better than 1 mm. Our findings position this low-power, Halbach-based MPI scanner as a promising tool for molecular imaging laboratories and a significant step towards future human-scale applications.