Analysis of proton-density bias corrections based on T1 measurement for robust quantification of water content in the brain at 3 Tesla

Zaheer Abbas, Vincent Gras, Klaus Möllenhoff, Fabian Keil, Ana Maria Oros-Peusquens, Nadim J. Shah

Research output: Contribution to journalArticleResearchpeer-review

35 Citations (Scopus)

Abstract

Purpose: Estimating tissue water content using high field MRI, such as 3 Tesla (T), is challenging due to the difficulty in dissociating the radio frequency inhomogeneity pattern from the signal arising from tissue intrinsic proton density (PD) variations. To overcome this problem the longitudinal relaxation time T1 can be combined with an initial guess of the PD to yield the desired PD bias correction. However, it is necessary to know whether T1 effects, i.e., any effect contributing to T1 while being independent of tissue hydration, influence the estimated correction.

Methods: Twenty-five healthy subjects underwent a quantitative 3T MRI protocol enabling acquisition of 64 slices with 1 mm in-plane resolution and 2 mm slice thickness in 14 min. Influence of T1effects on the estimated water content map is evaluated using a dedicated method including T1 and T2 information and region of interest-based water content values are compared with the literature.

Results: Our analysis indicates that the PD bias correction based on T1 is largely insensitive to T1 effects. Besides, water content results are in good agreement with literature values obtained at 1.5T.

Conclusion: This study demonstrates the applicability of a PD bias correction based on T1 to yield tissue water content at 3T.

Original languageEnglish
Pages (from-to)1735-1745
Number of pages11
JournalMagnetic Resonance in Medicine
Volume72
Issue number6
DOIs
Publication statusPublished - 1 Dec 2014
Externally publishedYes

Keywords

  • Cerebral oedema
  • Parametric mapping
  • Proton density
  • Quantitative imaging
  • Water content

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