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Table 7 The table represents different plaque constituents and their MRI visible protons in active chemical groups. These different constituents exhibit specific MRI signal intensity determined by their specific relaxation times T1 and T2 at specific 9.4 T magnetic field.

From: MRI of coronary artery atherosclerosis in rabbits: Histopathology-MRI correlation and atheroma characterization

Plaque components Chemical structure T1(ms) T2(ms) MRI Visibility*
   S = N(1 - e-T1/TR) S = N(1 - e-TE/TR) T1-w T2-w PD-w
Lipid -CH2-CH2- 1643.3 ± 25.6 52.9 ± 2.5 + - +/-
Cholesterol -CH3 643.5 ± 34.5 14.3 ± 0.9 + +/- +/-
Calcium Bound form 56.5 ± 10 2.2 ± 0.4 -- -- --
Collagen -CH2 (-Gly-Hyp-Pro-) 1750.4 ± 25.4 54.1 ± 0.8 + +/- +
Elastin -CH2-N H2 1640.6 ± 16.2 62.2 ± 1.1 +/- +/- +
Atheroma Paramagnetic Heme 1204.2 ± 14.4 16.0 ± 1.2 + - -
  1. * The relative gray scale MR signal intensity is shown as +(bright hyperintense), +/-(gray isointense), -(dark hypointense) on T1-weighted, T2-weighted and proton density(PD) weighted images.