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本研究目的：①评价使用超声探头置于沸沸颈总动脉和颈内动脉测量十GZ作用期间脑血流变化（BF）的优劣。把探头测得的BF与用微球测得的整个大脑的BF作比较。②测量十GZ作用期间大脑和脊柱的局部血流变化，以验证“＋GZ能够引起整个中枢神经系统有差别的血液灌注减少，大脑顶部?
The purpose of this study: ① evaluate the use of ultrasound probe placed in the common carotid artery and internal carotid artery measured during the 10GZ role of cerebral blood flow (BF) in the pros and cons. Compare the BF measured by the probe with the whole brain measured with microspheres. ② To measure local blood flow changes in the brain and spine over a 10 GZ period to verify that "+ GZ can cause differential blood perfusion throughout the central nervous system to decrease, at the top of the brain?