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evoked magnetic fields
相关语句
  诱发磁场
     The study of ECD strength of somatosensory evoked magnetic fields in patients with acute cerebral infarction by magnetoencephaigraphy
     急性脑梗死脑磁图体感诱发磁场发生源ECD强度研究
短句来源
     We measured somatosensory evoked magnetic fields and auditory evoked magnetic fields of healthy objects and patients of acute cerebral infarction by 306-channels magnetoencephalgraphy.
     本课题应用306通道MEG和1.5 Tesla MR成像系统对正常人和急性脑梗塞患者进行脑诱发磁场的测定,研究了(1)脑梗塞患者皮层中枢体感诱发磁场的变化特征; (2)脑梗塞患者皮层中枢听觉诱发磁场的变化特征。
短句来源
     Objective To investigate the change characteristics of time parameters of somatosensory evoked magnetic fields (SEFs) and auditory evoked magnetic fields (AEFs) in patients with acute cerebral infarction by magnetoencephalgraphy (MEG).
     目的研究急性脑梗死患者脑磁图(magnetoencephalography,MEG)体感诱发磁场(somatosensoryevokedmagneticfields,SEFs)和听觉诱发磁场(auditoryevokedmagneticfields,AEFs)时间参数变化。
短句来源
     The objective is to study the MSI of somatosensory evoked magnetic fields(SEFs)and auditory evoked magnetic fields(AEFs) of acute cerebral infarction patients and to assess the injury to cerebral function.
     研究内容和结果如下:1 急性脑梗塞初级体感皮层中枢脑磁图特征研究目的:通过脑磁图对急性脑梗塞患者进行体感诱发磁场测定,试图总结急性脑梗塞患者脑磁图体感诱发磁场的变化特点和其与正常人的脑磁图体感诱发磁场的差异,分析产生此种差异的可能原因,为进一步临床应用创造条件。
短句来源
     Methods:Somatosensory evoked magnetic fields (SEFs) were recorded from 15 acute cerebral infarction patients by a 306-channel whole-head MEG made by 4D Neuroimaging company(U.S.A) and 16 healthy volunteers were examined as control group.
     2 急性脑梗塞初级听觉皮层中枢脑磁图特征研究目的:通过脑磁图对急性脑梗塞患者进行听觉诱发磁场测定,试图总结急性脑梗塞患者脑磁图听觉诱发磁场的变化特点和其与正常人的脑磁图听觉诱发磁场的差异,分析产生此种差异的可能原因,为进一步临床应用创造条件。
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  “evoked magnetic fields”译为未确定词的双语例句
     Characteristics of auditory evoked magnetic fields in patients with acute cerebral infarction by magnetoencephalography
     急性脑梗死听觉皮层中枢脑磁图特征
短句来源
     The clinical study of somatosensory evoked magnetic fields in patients with acute cerebral infarction by magnetoencephalography
     急性脑梗死患者初级体感皮质中枢脑磁图特征的研究
短句来源
     Investigation of the change characteristics of time parameters of somatosensory evoked magnetic fields (SEFs) and auditory evoked magnetic fields (AEFs) in patients with acute cerebral infarction by magnetoencephalgraphy
     急性脑梗死患者脑磁图SEFs和AEFs时间参数变化特征
短句来源
     The Clinical Study of Cerebral Evoked Magnetic Fields in Acute Cerebral Infarction by Magnetoencephalgraphy
     急性脑梗塞脑磁图特征研究
短句来源
     Part one —Auditory evoked magnetic fields on the normal adultsIn part one,the instrumentation system detecting and recording AEF had heen established and firstly measured AEF on the normal adults domestically.
     在第一部分实验中,我们在零磁空间实验室,利用超导量子干涉仪,建立了一套探测脑磁反应的描记系统,测量了我国正常青壮年的诱发脑磁反应。
短句来源
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  相似匹配句对
     The Acoustically Evoked Magnetic and Acoustical Responses of Auditory System
     听觉系统声诱发反应的磁声场记录
短句来源
     Determination of Normal Value of Magnetic Motor Evoked Potential
     磁刺激运动诱发电位正常值测定
短句来源
     Magnetic Shift
     磁移位
短句来源
     MAGNETIC ENCODER
     磁性编码器
短句来源
     Evoked potentialsmayfindtheparaclinicalorsilentlesions.
     诱发电位及 MRI检查有助于发现亚临床病变。
短句来源
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  evoked magnetic fields
Somatosensory evoked magnetic fields and electrical potentials were measured in eight patients with unilateral neuropathic pain.
      
Steady-state visual evoked magnetic fields (SSVEFs) were recorded in response to a flickering light source using a 37-channel magnetometer.
      
Human middle latency auditory evoked magnetic fields
      
Auditory evoked magnetic fields (AEMFs) in response to contralaterally and ipsilaterally presented 1 kHz tone bursts were recorded from the right hemisphere of 12 subjects with normal hearing in two replicate sessions several days apart.
      
To establish an objective visual field analysis by visual evoked magnetic fields.
      
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Multichannel MEG detecting system with high temporal resolution provides a possibility to determine the dynamical parameters of electrical activities in a human brain. From analysis of singular value sequence of spatio-temporal MEG data matrix during a series of succeeding time slices at different places outside the head, the ranfk of the corresponding signal matrix can be obtained. The value of the rank is equal to the number of electrical activity sources during the same period. With the obtained source number,...

Multichannel MEG detecting system with high temporal resolution provides a possibility to determine the dynamical parameters of electrical activities in a human brain. From analysis of singular value sequence of spatio-temporal MEG data matrix during a series of succeeding time slices at different places outside the head, the ranfk of the corresponding signal matrix can be obtained. The value of the rank is equal to the number of electrical activity sources during the same period. With the obtained source number, the dynamical parameters of electrical activities can be determined by using optimization algorithm. The results from computer simulation have verified the effectiveness of the proposed method. The method was then applied to source estimation for auditory-evoked magnetic fields. The results also demonstrated the effectiveness of the method.

多通道高时间分辨率脑磁探测系统为反演脑内动态电活动参数提供了一种可能性。通过分析头表面某一连续时间片段上时域 空域磁场数据矩阵的奇异值序列分布特征 ,可以确定相应信号矩阵的秩 ,从而获得某一时段脑内电活动源的数目。进而在该时段内选用相应的源数目 ,并利用优化算法 ,即可反演出脑内电活动源的动态参数。模拟计算及对声音刺激的诱发脑磁源的计算均表明这一方法是有效的。

Objective To investigate the characteristics of auditory evoked magnetic fields (AEFs) in patients with acute cerebral infarction by magnetoencephalgraphy ( MEG) . Methods AEFs were recorded from 15 patients with acute cerebral infarction and 9 health volunteers using 306-channel whole-head MEG. The auditory stimuli of 2 kHz pure tone were binaurally presented with interstimulus intervals (ISI) of 1 s. The intensity of stimuli was 90 dB and the stimulus durations was 8 ms. The peaks of AEFs were estimated...

Objective To investigate the characteristics of auditory evoked magnetic fields (AEFs) in patients with acute cerebral infarction by magnetoencephalgraphy ( MEG) . Methods AEFs were recorded from 15 patients with acute cerebral infarction and 9 health volunteers using 306-channel whole-head MEG. The auditory stimuli of 2 kHz pure tone were binaurally presented with interstimulus intervals (ISI) of 1 s. The intensity of stimuli was 90 dB and the stimulus durations was 8 ms. The peaks of AEFs were estimated by equivalent current dipole (ECD) ,which were superimposed on MRI. Results M100 was the most prominent components of AEFs. It originated from the area close to posterior Heschl' s gyrus. There appeared several abnormal AEFs parameters in patient group, i. e; ( 1 ) The value of interhemispheric difference of the M100 positions was (14. 9±10. 6) mm in normal group and ( 18. 6±3.3) mm in patient group, showing significant differences between two groups ( P < 0. 05 ) . ( 2 ) The peak latency of Ml00 responses was (89. 3±27. 9) ms in control group and (97. 0±6. 0) ms in patient group, respectively, with a significantly prolonged in the later(P <0. 05). (3) The strength of ECD was ( 17. 2±4. 8) nA in affected hemisphere, being much smaller than that in the unaffected hemisphere ( 30. 5±5.9) nA ( P < 0. 01 ) . Conclusion Latent cortical impairment might be evaluated by MEG with higher spatial and temporal resolution. It should provide the objective and sensitive indexes to evaluate the function of auditory cortex in patients with acute cerebral infarction.

目的 研究急性脑梗死患者听觉皮层中枢脑磁图(MEG)变化特征。方法 对15例急性脑梗死患者于发病后3-4周进行听觉诱发磁场(AEFs)检测,同时检测9名健康志愿者作为对照。采用双耳纯音刺激,诱发双侧听觉皮层兴奋。纯音频率2 kHz,声音强度90 dB,刺激间隔1s,纯音持续时间8ms。脑磁图检查后进行MRI超薄扫描。AEFs波峰由等价电流偶极子(ECD)评估。结果两组AEFs的最主要波峰为M100,其ECD位于两侧颞横回。患者组多个AEFs参数均存在异常,即:(1)健康对照组两侧M100 ECD空间位置差值为(14.9±10.6)mm;患者组为(18.6±3.3)mm,患者组不对称性增大(P<0.05);(2)健康对照组M100潜伏期为(89.3±27.9)ms;患者组(97.0±6.0)ms.患者组潜伏期明显延迟(P<0.05);(3)患者患侧ECD强度为(17.2±4.8)nA,健侧ECD强度为(30.5±5.9)nA,患侧ECD强度减小(P<0.01)。结论 MEG可灵敏地检测出急性脑梗死患者听觉皮层中枢功能损伤,并能够客观地评价该病听觉皮层中枢的功能状态。

Objective:To survey the mechanisms of rehabilitation training for hemiplegia by magnetic source imaging(MSI).Method:To observe the movement evoking magnetic fields changes in primary motor cortex before and after motor function recovery of a hemiplegia of silent zone infarction;Result:The movement evoking magnetic fields in right primary motor cortex corresponding to the left hemiplegia appeared after motor function recovery.But its latency was much longer than the left brain.MSI orientation...

Objective:To survey the mechanisms of rehabilitation training for hemiplegia by magnetic source imaging(MSI).Method:To observe the movement evoking magnetic fields changes in primary motor cortex before and after motor function recovery of a hemiplegia of silent zone infarction;Result:The movement evoking magnetic fields in right primary motor cortex corresponding to the left hemiplegia appeared after motor function recovery.But its latency was much longer than the left brain.MSI orientation showed that the location was anterior to the normal position.Conclusion:Formal comprehensive rehabilitation training for the hemiplegia not only improves motor function but also facilitates the changes of cerebral structure and function.MSI supportes the hypothesis of neighborhood cortex substitution.The function of the affected side is worse than the unaffected in quality,which suggests that the poorer movement response velocity and coordination should be responsible for it.

应用磁源性影像(MSI)技术探讨康复治疗机制。方法:应用磁源性影像技术观察分析1例哑区梗死致左侧偏瘫者运动功能恢复前后运动皮层诱发磁场变化。结果:康复训练运动功能恢复后,脑磁场诱发反应波出现,潜伏期较对侧明显延长,MSI定位前移。结论:规范康复训练伴随着运动功能的改善,脑结构和功能也发生了相应的变化,MSI研究支持康复训练促进功能恢复的邻近皮层功能代偿学说。重新获得的功能在质量上低于未受损肢体功能,与运动的反应速度、协调性有关。

 
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