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Magnetization transfer characteristics in atherosclerotic plaque components assessed by adapted binomial preparation pulses

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Abstract

Increasing the contrast between atheromatous plaque components is a major issue in cardiovascular MRI research. It would allow one to identify unstable plaque by differentiating the lipid core associated with vulnerability, from the fibrous cap, considered as a factor of stability. T2 and diffusion-weighted imaging have already provided satisfying results. Magnetization transfer (MT) between restricted protons Hr and free-water protons Hf could achieve a different contrast related to collagen and lipoprotein macromolecules present in the fibrous cap and lipid core, respectively. The purpose of this work was to evaluate in vitro the MT effect produced by adapted T2-selective 1-3-3-1 binomial pulses on isolated samples of atheromatous arteries at 3 T. A method based on simulation was used in order to improve the MT specificity: it is shown that 50% 1-3-3-1 pulses (the percentage indicating the level of Hr saturation) allow an estimation of T2r, the Hr T2. Using this technique, magnetization transfer was observed for the first time in atherosclerotic plaque components, an effect more pronounced for the fibrous cap and media than for the lipid core and advantitia. The T2r estimation gave values ranging from 20 to 25 μs for the four samples. This preliminary study provides a basis for establishing an MT imaging sequence of atheromatous arteries, by using 50% 1-3-3-1 pulses calibrated for saturating protons with a 20 μs T2. This MT protocol should be further compared to T2 and diffusion-weighted imaging.

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Authors and Affiliations

  1. Service Hospitalier Frédéric Joliot, C.E.A., 4 place du Général Leclerc, 91404, Orsay, France

    Mathilde Pachot-Clouard, Françoise Vaufrey & Jean-François Toussainti

  2. Unité de Recherche en Résonance Magnétique Médicale, Université de Paris-Sud, batiment 220, 91405, Orsay, France

    Luc Darrasse

  3. Laboratoire d'Imagerie Paramétrique URA 1458, CNRS, 15 rue de l'Ecole de Médecine, 75006, Paris, France

    Jean-François Toussainti

Authors
  1. Mathilde Pachot-Clouard
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  2. Françoise Vaufrey
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  3. Luc Darrasse
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  4. Jean-François Toussainti
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Correspondence to Mathilde Pachot-Clouard.

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Pachot-Clouard, M., Vaufrey, F., Darrasse, L. et al. Magnetization transfer characteristics in atherosclerotic plaque components assessed by adapted binomial preparation pulses. MAGMA 7, 9–15 (1998). https://doi.org/10.1007/BF02592251

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  • DOI: https://doi.org/10.1007/BF02592251

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