Pierre Gillis

TL;DR: In this article, the Curie relaxation was used to explain the low-field part of the NMRD profiles, which can only explain the crystal's internal anisotropy energy, a concept which clarifies the important difference between superpara-and paramagnetic compounds.

TL;DR: On the basis of the agreement of theory with data for solutions of small paramagnetic complexes, large magnetite particles, and liver containing low‐density polymer‐coated magnetite agglomerates, it is argued that the theory is sufficiently reliable so that, e.g., for ferritin, it appears that diffusion through intracellular gradients determines 1/T2.

TL;DR: There are different types of maghemite particles whose relaxation characteristics are suited to a specific MRI application, and the relaxation induced by ferritin in aqueous solutions has been demonstrated to be caused by the exchange of protons between bulk water protons and the surface of the ferrihydrite crystal.

TL;DR: Ferrite superparamagnetic (SPM) nanoparticles in aqueous suspensions shorten the nuclear magnetic relaxation of water protons as mentioned in this paper, and that effect is enhanced when agglomeration of elementary SPM cores occurs, because of an increase of the secular part of the transverse relaxivity.

TL;DR: A “partial refocusing model” is introduced, based on a spatial division between an inner region where the gradients are too strong for the refocusing pulses to be efficient and an outer region where they are efficient, which agrees with published simulations of relaxation induced by magnetic dipoles approximated as points.