Calculation of the energy transferred by radiation damping from nuclear spin system to receiver coil in NMR

Mao, Xi‐an

doi:10.1016/j.cplett.2020.137853

Cited by 1 publication

(1 citation statement)

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“…The nonlinear interaction between all slices is mediated by the virtual photons (wavy arrows, wavelength ≫ sample dimension) in the resonator (red) ( 51 ). After the RASER burst, the Zeeman energy of the spins is fully transferred to the current of the coil ( 52 ). ( A ) For N = 1 and T 1 = ∞, the signal α 1 ( t ) = α( t ) is plotted in the [ t , Re(α), Im(α)] space (left).…”

Section: Introductionmentioning

confidence: 99%

RASER MRI: Magnetic resonance images formed spontaneously exploiting cooperative nonlinear interaction

et al. 2022

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The spatial resolution of magnetic resonance imaging (MRI) is limited by the width of Lorentzian point spread functions associated with the transverse relaxation rate 1/ T 2 * . Here, we show a different contrast mechanism in MRI by establishing RASER (radio-frequency amplification by stimulated emission of radiation) in imaged media. RASER imaging bursts emerge out of noise and without applying radio-frequency pulses when placing spins with sufficient population inversion in a weak magnetic field gradient. Small local differences in initial population inversion density can create stronger image contrast than conventional MRI. This different contrast mechanism is based on the cooperative nonlinear interaction between all slices. On the other hand, the cooperative nonlinear interaction gives rise to imaging artifacts, such as amplitude distortions and side lobes outside of the imaging domain. Contrast mechanism and artifacts are explored experimentally and predicted by simulations on the basis of a proposed RASER MRI theory.

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Section: Introductionmentioning

confidence: 99%