This paper presents an approach for three-dimensional motion measurement and analysis by applying the electric measuring technique and the kinematic principles of rigid body.

本文应用电测技术和刚体运动学原理，提出了一个三维运动测量和计算方法。

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Methods a device that measures the three-dimensional motion and stiffness of the cervical spine in vivo was designed according to 3-dimensional 6-degree of freedom motion principle of spine.

方法：根据脊柱3轴6自由度运动原理，制作活体颈椎三维运动和刚度测试装置。

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Objective To study the effect of the expansive open-door laminoplasty on the three-dimensional motion and stiffness of the cervical spine.

目的研究颈椎后路单开门椎管扩大成形术对颈椎三维运动及刚性的影响。

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With recent improvements in three-dimensional motion analysis, House is able to analyze motion at 1, 000 frames per second, up from 32 frames that the human eye can process.

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But researchers at the Centre for the Developing Brain have found ways to counter the effects of these movements, building up full three-dimensional pictures while the foetus is in motion.

BBC: Babies' brains to be mapped in the womb and after birth