Rapid TAURUS for Relaxation-Based Color Magnetic Particle Imaging

Magnetic particle imaging (MPI) is a rapidly developing medical imaging modality that exploits the non-linear response of magnetic nanoparticles (MNPs). Color MPI widens the functionality of MPI, empowering it with the capability to distinguish different MNPs and/or MNP environments. The system func...

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Veröffentlicht in:arXiv.org 2021-12
Hauptverfasser: M Tunç Arslan, A Alper Özaslan, Kurt, Semih, Muslu, Yavuz, Emine Ulku Saritas
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A Alper Özaslan
Kurt, Semih
Muslu, Yavuz
Emine Ulku Saritas
description Magnetic particle imaging (MPI) is a rapidly developing medical imaging modality that exploits the non-linear response of magnetic nanoparticles (MNPs). Color MPI widens the functionality of MPI, empowering it with the capability to distinguish different MNPs and/or MNP environments. The system function approach for color MPI relies on extensive calibrations that capture the differences in the harmonic responses of the MNPs. An alternative calibration-free x-space-based method called TAURUS estimates a map of the relaxation time constant, by recovering the underlying mirror symmetry in the MPI signal. However, TAURUS requires a back and forth scanning of a given region, restricting its usage to slow trajectories with constant or piecewise constant focus fields (FFs). In this work, we propose a novel technique to increase the performance of TAURUS and enable \(\tau\) map estimation for rapid and multi-dimensional trajectories. The proposed technique is based on correcting the mirror symmetry distortion induced by time-varying FFs. We demonstrate via simulations and experiments in our in-house MPI scanner that the proposed method successfully estimates high-fidelity time constant maps for rapid trajectories that provide orders of magnitude reduction in scanning time while preserving the calibration-free property of TAURUS.
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subjects Calibration
Color
Estimates
Harmonic response
Magnetic induction
Medical imaging
Nanoparticles
Nonlinear response
Relaxation time
Symmetry
Time constant
title Rapid TAURUS for Relaxation-Based Color Magnetic Particle Imaging
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