Share Email Print
cover

Journal of Biomedical Optics

Comparison of blood-oxygen-level–dependent functional magnetic resonance imaging and near-infrared spectroscopy recording during functional brain activation in patients with stroke and brain tumors
Author(s): Kaoru Sakatani; Yoshihiro Murata; Norio Fujiwara; Tatsuya Hoshino; Shin Nakamura; Tsuneo Kano; Yoichi Katayama
Format Member Price Non-Member Price
PDF $20.00 $25.00

Paper Abstract

Blood-oxygen-level–dependent contrast functional magnetic resonance imaging (BOLD-fMRI) has been used to perform functional imaging in brain disorders such as stroke and brain tumors. However, recent studies have revealed that BOLD-fMRI does not image activation areas correctly in such patients. To clarify the characteristics of the evoked cerebral blood oxygenation (CBO) changes occurring in stroke and brain tumors, we have been comparing near-infrared spectroscopy (NIRS) and BOLD-fMRI recording during functional brain activation in these patients. We review our recent studies and related functional imaging studies on the brain disorders. In the primary sensorimotor cortex (PSMC) on the nonlesion side, the motor task consistently caused a decrease of deoxyhemoglobin (deoxy-Hb) with increases of oxyhemoglobin (oxy-Hb) and total hemoglobin (t-Hb), which is consistent with the evoked CBO response observed in normal adults. BOLD-fMRI demonstrated robust activation areas on the nonlesion side. In stroke patients, severe cerebral ischemia (i.e., misery perfusion) caused an increase of deoxy-Hb during the task, associated with increases of oxy-Hb and t-Hb, in the PSMC on the lesion side. In addition, the activation volume of BOLD-fMRI was significantly reduced on the lesion side. The BOLD signal did not change in some areas of the PSMC on the lesion side, but it tended to decrease in other areas during the tasks. In brain tumors, BOLD-fMRI clearly demonstrated activation areas in the PSMC on the lesion side in patients who displayed a normal evoked CBO response. However, the activation volume on the lesion side was significantly reduced in patients who exhibited an increase of deoxy-Hb during the task. (Partial Abstract)

Paper Details

Date Published: 1 November 2007
PDF: 8 pages
J. Biomed. Opt. 12(6) 062110 doi: 10.1117/1.2823036
Published in: Journal of Biomedical Optics Volume 12, Issue 6
Show Author Affiliations
Kaoru Sakatani, Nihon Univ. School of Medicine (Japan)
Yoshihiro Murata, Nihon Univ. School of Medicine (Japan)
Norio Fujiwara, Nihon Univ. School of Medicine (Japan)
Tatsuya Hoshino, Nihon Univ. School of Medicine (Japan)
Shin Nakamura, Nihon Univ. School of Medicine (Japan)
Tsuneo Kano, Nihon Univ. School of Medicine (Japan)
Yoichi Katayama, Nihon Univ. School of Medicine (Japan)


© SPIE. Terms of Use
Back to Top