Volume 45, Issue 3 pp. 397-408
Full Paper

Vessel size imaging

Irène Troprès

Irène Troprès

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Stephan Grimault

Stephan Grimault

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Albert Vaeth

Albert Vaeth

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Emmanuelle Grillon

Emmanuelle Grillon

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Cécile Julien

Cécile Julien

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Jean-François Payen

Jean-François Payen

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Laurent Lamalle

Laurent Lamalle

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

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Michel Décorps

Corresponding Author

Michel Décorps

Unité mixte INSERM/Université Joseph Fourier, Hôpital Albert Michallon, Grenoble, France

INSERM U438, Hôpital Michallon, BP 217, 38043, Grenoble cédex 9, France===Search for more papers by this author

Abstract

Vessel size imaging is a new method that is based on simultaneous measurement of the changes ΔR2 and ΔRurn:x-wiley:07403194:media:MRM1052:tex2gif-stack-1 in relaxation rate constants induced by the injection of an intravascular superparamagnetic contrast agent. Using the static dephasing approximation for ΔRurn:x-wiley:07403194:media:MRM1052:tex2gif-stack-2 estimation and the slow-diffusion approximation for ΔR2 estimation, it is shown that the ratio ΔR2Rurn:x-wiley:07403194:media:MRM1052:tex2gif-stack-3 can be expressed as a function of the susceptibility difference between vessels and brain tissue, the brain water diffusion coefficient, and a weighted mean of vessel sizes. Comparison of the results with 1) the Monte Carlo simulations used to quantify the relationship between tissue parameters and susceptibility contrast, 2) the experimental MRI data in the normal rat brain, and 3) the histologic data establishes the validity of this approach. This technique, which allows images of a weighted mean of the vessel size to be obtained, could be useful for in vivo studies of tumor vascularization. Magn Reson Med 45:397–408, 2001. © 2001 Wiley-Liss, Inc.

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