Modeling dynamic cerebral blood volume changes during brain activation on the basis of the blood-nulled functional MRI signal

Changwei W. Wu, Ho Ling Liu, Jyh Horng Chen

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Recently, vascular space occupancy (VASO) based functional magnetic resonance imaging (fMRI) was proposed to detect dynamic cerebral blood volume (CBV) changes using the blood-nulled non-selective inversion recovery (NSIR) sequence. However, directly mapping the dynamic CBV change by the NSIR signal change is based on the assumption of slow water exchange (SWE) around the capillary regime without cerebral blood flow (CBF) effects. In the present study, a fast water exchange (FWE) model incorporating with flow effects was derived from the Bloch equations and implemented for the quantification of dynamic CBV changes using VASO-fMRI during brain activation. Simulated results showed that only subtle differences in CBV changes estimated by these two models were observed on the basis of previously published VASO results. The influence of related physiological and biophysical factors within typical ranges was evaluated in steady-state simulations. It was revealed that in the transient state the CBV curves could be delayed in comparison with measured NSIR curves owing to the imbalance between the inflowing and outflowing blood signals.

Original languageEnglish
Pages (from-to)643-651
Number of pages9
JournalNMR in Biomedicine
Volume20
Issue number7
DOIs
Publication statusPublished - Nov 1 2007
Externally publishedYes

Keywords

  • Ascular space occupancy
  • Cerebral blood flow
  • Cerebral blood volume
  • Functional magnetic resonance imaging

ASJC Scopus subject areas

  • Spectroscopy
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology
  • Biophysics

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