Brain Activation Study during Stroke Recovery Using BOLD-fMRI
首发时间:2015-02-04
Abstract:Stroke recovery involves a battery of plastic changes in the brain. Blood oxygen level dependent (BOLD) functional magnetic resonance imaging (fMRI) technology provides brain activation information with exquisite spatial resolution as a powerful tool for investigating changes in brain plasticity. In this paper, we performed a longitudinal study examining plasticity of functional activation as exhibited by BOLD-fMRI following stroke. Data were collected from 11 patients with corticospinal tract (CST) damage at three stages of recovery, i.e., acute stage (<2wks), early stage (1mon-3mons) and chronic stage (>3mons) post stroke. The evolution of cortical activations for both affected and unaffected hand motion tasks were studied. Quantitative activation measurements including the effective size and sum of t values were calculated and the correlations of these values with patient Fugl-Meyer index were analyzed across all stages. Stroke patients showed a shift from bilateral activation in acute and early stage to the ipsilesional activation in chronic stage when performing a movement task with the affected hand, which suggests a compensation effect from the contralesional hemisphere during the recovery process. The correlation analysis showed a significantly negative correlation with cingulate cortex activity at early stage from both quantitative activation measurements, implying the important role of cingulate cortex in stroke recovery. Further investigations are in need to improve the understanding of functional recovery in stroke patients.
keywords: Stroke recovery functional magnetic resonance imaging brain plasticity
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基于BOLD-fMRI技术的脑卒中康复脑功能活动研究
摘要:脑卒中康复包含多阶段的脑功能重塑,基于血氧水平依赖(BOLD)的功能磁共振成像(fMRI)作为一种强有力的技术手段,能够提供高分辨率脑功能成像,用以研究大脑损伤后可塑性的变化。本文基于任务相关的fMRI影像技术,对脑卒中病人康复过程进行了长时程察,研究病人大脑功能激活的可塑性变化。我们分为三个阶段采集到11个病灶累及皮质脊髓束的脑卒中病人的功能影像数据:急性期(2周以内),康复期(1~3个月),康复后期(大于3个月)。在功能成像中,病人要求执行患侧手和健侧手的对指运动。实验结果发现中风患者在急性期和康复期患手运动时,双侧大脑均有激活,到康复后期向患侧脑转移并集中,表明健侧脑对运动功能恢复的一种补偿。并且,在康复期执行患手对指运动时,侧扣带回的激活体积、激活强度都与Fugl-Meyer 评分呈显著的负相关,显示了该区域功能在中风康复中的重要性。
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