Tracking and analysis of human head motion during Guided fMRI motor tasks

Ningbo Yu, C. Hollnagel, Peter Wolf, W. Murr, A. Blickenstorfer, S. Kollias, R. Riener
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引用次数: 6

Abstract

In this work, we studied human head motions during upper extremity motor task, conducted in functional magnetic resonance imaging (fMRI) studies. The experiments were performed on a mock up of the MRI bench. Three kinds of linear movements in the caudal-cranial, left-right and anterior-posterior directions, a reaching movement as well as single joint movements at shoulder, elbow and wrist, were investigated at three different speeds with the right arm. Optical markers tracked by a high-precision motion tracking system were used to detect head and arm movements. For each task, the head moved principally in the direction of right-caudal-posterior to left-cranial-anterior, parallel to the line from the right shoulder joint to the head. No principal rotation axis was observed. The translational and rotational head motions were 1.7 ∼ 8.4 mm and 0.15° ∼ 0.96°, respectively. We then applied a special head fixation to stabilize the head, and repeated all the experiments. The translational and rotational head motions were significantly suppressed by 78% and 73%, to the range of 0.3 ∼ 2.4 mm and 0.04°. ∼ 0.39°
引导fMRI运动任务中人类头部运动的跟踪与分析
在这项工作中,我们通过功能性磁共振成像(fMRI)研究了上肢运动任务中人类头部的运动。实验是在模拟的核磁共振实验台上进行的。研究了右臂在三种不同速度下的尾颅、左右和前后方向的三种线性运动,以及肩、肘、腕的单关节运动。由高精度运动跟踪系统跟踪的光学标记用于检测头部和手臂的运动。在每项任务中,头部的运动方向主要是右尾-后到左颅-前,与右肩关节到头部的直线平行。未观察到主旋转轴。头部的平移和旋转运动分别为1.7 ~ 8.4 mm和0.15°~ 0.96°。然后我们使用一种特殊的头部固定装置来稳定头部,并重复所有的实验。平移和旋转头部运动被显著抑制了78%和73%,范围为0.3 ~ 2.4 mm和0.04°。∼0.39°
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