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This paper investigates the effect of duty ratio on the background signal of handheld magnetic particle imaging (MPI) system. The background signal is the most influential noise signal in MPI system. Hand-held MPI systems need to be used continuously for long periods of time, so they are susceptible to interference from background signals. By adjusting the duty ratio and single detection time used by the system, a set of parameters with minimal background signal variation is determined. During the experiment, we summarized testing procedures to determine the most appropriate duty ratio for the MPI system, which can be tried on other MPI systems.
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