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Relaxation mechanism of magnetic particles is crucial in differentiating particles and estimating temperature and viscosity for diagnosis and treatment. The magnetization recovery process in field flat phase of pulsed excitation generates decay signals that can be fitted by a bi-exponential model. The relaxation time spectrum can be generated by using inverse Laplace transform.
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Reconstructed 2D Shepp-Logan phantom and brain MRA projected image using different flat portions in pulsed excitation and magnetic nanoparticle sizes.
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