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Theory of proton relaxation induced by superparamagnetic particles
Evaluating and understanding the performances of magnetic colloids as contrast agents for MRI requires a theory describing their magnetic interactions with water protons. The field dependence of theExpand
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Magnetic resonance relaxation properties of superparamagnetic particles.
Nanometric crystals of maghemite are known to exhibit superparamagnetism. Because of the significance of their magnetic moment, maghemite nanoparticles are exceptional contrast agents and are usedExpand
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Superparamagnetic colloid suspensions: Water magnetic relaxation and clustering
Abstract Ferrite superparamagnetic (SPM) nanoparticles in aqueous suspensions shorten the nuclear magnetic relaxation of water protons. For transverse relaxation, that effect is enhanced whenExpand
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On T2‐shortening by strongly magnetized spheres: A partial refocusing model
Computer simulations of water transverse relaxation induced by superparamagnetic particles are shown to disagree with the available theories, covering the slow diffusion domain. Understanding theseExpand
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Dy‐DTPA derivatives as relaxation agents for very high field MRI: The beneficial effect of slow water exchange on the transverse relaxivities
Proton longitudinal and transverse relaxivities of Dy(DTPA)2− and Dy‐DTPA bisamide derivatives (Dy(DTPA‐BA): Dy‐DTPA bisamide, Dy(DTPA‐BEA): Dy‐DTPA bisethylamide, Dy(DTPA‐BnBA): Dy‐DTPAExpand
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On T2‐shortening by weakly magnetized particles: The chemical exchange model †
Chemical exchange (CE) theory is compared with two theories of T2‐shortening caused by microscopic magnetic centers: inner‐ and outer‐sphere relaxation theory (long‐echo limit) and mean gradientExpand
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Relaxation induced by ferritin and ferritin‐like magnetic particles: The role of proton exchange
Proton T1 and T2 in solutions of ferritin and fercayl (a ferritin‐like iron‐dextran particle) solutions were measured, over a wide range of various parameters (Bo, temperature, interecho‐time andExpand
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Fiber-to-field angle dependence of proton nuclear magnetic relaxation in collagen.
Longitudinal and transverse proton relaxation times were measured on pig tendon. For T1, dispersion curves and more accurate measurements at 20 MHz are presented. Values of T2 were obtained from CPMGExpand
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Proton Transverse Nuclear Magnetic Relaxation in Oxidized Blood: a Numerical Approach
When red blood cells are deoxygenated, hemoglobin, which is then transformed into deoxyhemoglobin or methemoglobin, becomes paramagnetic. The transverse nuclear magnetic relaxation rate of waterExpand
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Anomalous nuclear magnetic relaxation of aqueous solutions of ferritin: An unprecedented first‐order mechanism
Ferritin, the iron‐storing protein, speeds up proton transverse magnetic relaxation in aqueous solutions. This T2 shortening is used in MRI to quantify iron in the brain and liver. CurrentExpand
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