Magnetic resonance imaging-based compartmentation and its application to measuring metabolite concentrations in the frontal lobe

Jonathan C.W. Brooks, Neil Roberts, Graham J. Kemp, Peter A. Martin, Graham H. Whitehouse

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

Partial volume mixing of water compartments within a spectros-copy voxel (e.g. cerebrospinal fluid within a 'brain' voxel) may, if not corrected for, lead to underestimation of brain metabolite concentrations. To correct for this source of bias, a new imaging-based method of compartmentation analysis is presented. Brain water, cerebrospinal fluid and solid matter content were obtained from proton density- and T2-weighted images of the brain and an external standard in 10 healthy young males (21 to 30 years), and results compared with a previously-described technique based on spectroscopy. Mean (SD) fractional water content (β(MR)) of the 2 x 2 x 2 cm3 voxel in the frontal lobes was 0.79 (0.03) by imaging, slightly but significantly (p = 0.03) smaller than the value of 0.83 (0.03) obtained by spectroscopy. From water-suppressed spectra recorded at five echo times, using β(MR) determined by imaging, the T2-corrected concentrations of compounds containing N- acetylaspartate, creatine, choline and myo-inositol were 10.6 (1.0), 8.0 (0.9), 1.6 (0.3) and 3.7 (0.7) mmol.l-1 of brain, respectively. Imaging- based compartmentation is a rapid and straightforward technique, and can be performed on standard MR systems.

Original languageEnglish
Pages (from-to)883-888
Number of pages6
JournalMagnetic Resonance in Medicine
Volume41
Issue number5
DOIs
Publication statusPublished - 1999

Keywords

  • Compartmentation
  • Frontal lobe
  • Imaging
  • Spectroscopy

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