Response characteristics of magnetic particle spectroscopy under different excitation waveforms

Magnetic particle spectroscopy (MPS) is a method to characterize the characteristics of magnetic nanoparticles (MNP), which is of great significance for the research of magnetic particle imaging (MPI) and magnetic hyperthermia. In the MPS system, the waveform characteristics of the excitation magnetic field will directly impact the received particle signal. Sinusoidal excitation waveforms are the default choice in most MPI applications. This study focuses on the excitation effect of trapezoidal and triangular waveforms. The results show that under the excitation frequencies of 10 kHz and 15 kHz, the particle response of the trapezoidal wave is obviously higher than the other two waveforms, and the effect of the triangular wave is the worst. Research on excitation waveforms is fundamental to optimize MPI in the future.