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A ratio of 1 to 3 is well within the regime where the wavelength is "similar" to the object size, and diffraction/scattering effects are massively important. Without even getting into the details of diffraction patterns (which make the difference between these frequencies even more pronounced than my simplified explanation suggests), if we suppose that the ...


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MRI signal is always complex and it is related with signal demodulation. The detected signal is multiplied by a sinusoid or cosinusoid with frequency equals to $\omega_0 +\delta \omega$, respectively leading to the real and imaginary channels. You can find the complete algebra at $Haacke,\ Magnetic\ resonance\ imaging$ chapter 7.3.3 Phase is really useful ...



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