skip to main content
Show Results with:

Influence of baseline hematocrit on between-subject BOLD signal change using gradient echo and asymmetric spin echo EPI

Gustard, S. et al.

Magnetic resonance imaging : an international journal of basic research and clinical applications. VOL 21; NUMBER 6, ; 2003, 599-607 -- Elsevier Science B.V., Amsterdam. (pages 599-607) -- 2003

Online access

  • Title:
    Influence of baseline hematocrit on between-subject BOLD signal change using gradient echo and asymmetric spin echo EPI
  • Author: Gustard, S.;
    Williams, E. J.;
    Hall, L. D.;
    Pickard, J. D.;
    Carpenter, T. A.
  • Found In: Magnetic resonance imaging : an international journal of basic research and clinical applications. VOL 21; NUMBER 6, ; 2003, 599-607
  • Journal Title: Magnetic resonance imaging : an international journal of basic research and clinical applications.
  • Subjects: Medicine; Biotechnology; Pharmaceutical Chemistry; LCC: RC78; Dewey: 616.07548
  • Publication Details: Elsevier Science B.V., Amsterdam.
  • Language: English
  • Abstract: The dependence of BOLD signal change (BSC) on baseline hematocrit is in the process of being characterized, primarily using conventional Gradient Echo (GE) echo planar imaging (EPI). We describe the first empiric exploration of this relationship using, in addition to GE, Spin Echo (SE) and two Asymmetric Spin Echo EPI sequences (ASE10 and ASE20), which are less susceptible to large vessel noise. Motor cortex BSC was measured (N = 17) and regressed against hematocrit and hemoglobin concentration using linear and non-linear functions. GE measurements of BSC yielded a positive linear relationship (r2 = 0.240, p = 0.0459) whereas a positive non-linear relationship was observed using ASE10 (r2 = 0.571, p = 0.0146). Results suggest that between-subjects BSC is significantly dependent on baseline hematocrit. The nature of dependence, and implications for quantitative studies vary with the vessel size selectivity of the imaging sequence, and with the effect of hematocrit on blood viscosity in the imaged vessels.
  • Identifier: Journal ISSN: 0730-725X
  • Publication Date: 2003
  • Physical Description: Electronic
  • Shelfmark(s): 5337.795000
  • UIN: ETOCRN135619502

Searching Remote Databases, Please Wait