Lanjun J Guo

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Subcortical infarcts are most commonly the consequence of perforating artery occlusion and pure motor deficit is the most frequent syndrome resulting from an interruption of the corticospinal tract at the level of the corona radiate, the internal capsule or the brainstem. Motor evoked potential (MEP) monitoring is used as an adjunct to surgery as(More)
BACKGROUND/AIMS A major goal of intracranial surgery is to maximize resection while minimizing neurological morbidity, particularly motor dysfunction. Direct cortical stimulation (DCS) is a common intraoperative adjunct used to identify functional motor cortex. In this study, we report on the safety/efficacy of short pulse train DCS (direct cortical(More)
Terahertz (THz) imaging provides cutting edge technique in biology, medical sciences and non-destructive evaluation. However, due to the long wavelength of the THz wave, the obtained resolution of THz imaging is normally a few hundred microns and is much lower than that of the traditional optical imaging. We introduce a sub-wavelength resolution THz imaging(More)
OBJECTIVE Hemifacial spasm caused by a cerebellopontine angle lipoma is extremely rare. We describe a patient with left-sided hemifacial spasm caused by vascular compression of the facial and vestibulocochlear cranial nerves by the anteroinferior cerebellar artery embedded within a cerebellopontine angle lipoma. CLINICAL PRESENTATION A 77-year-old man(More)
OBJECTIVE To analyze optimal placement of recording-needle electrodes surrounding the eye and lip for facial nerve monitoring by identifying the maximum compound muscle action potential (CMAP) recorded by electrode pairs of different spatial configurations. STUDY DESIGN Prospective clinical trial. SETTING Ambulatory surgery at a tertiary care center. (More)
We studied transport through ultrasmall Si quantum-dot transistors fabricated from silicon-on-insulator wafers. At high temperatures, 4ϽTϽ100 K, the devices show single-electron or single-hole transport through the lithographically defined dot. At TϽ4 K, current through the devices is characterized by multidot transport. From the analysis of the transport(More)
Silicon single-electron devices are of great interest for future logic, memory and quantum computing. However, their usefulness is limited by the existence of traps related to the Si/SiO 2 interface, which interfere with the desired operation and lead to undesired characteristic features [1]. In this work, we report a new method for the fabrication of(More)
When increasing ambulation speed in Parkinson's disease, step cadence increases more than stride length, indicating movement scaling difficulties that affect step generation in particular. We investigated whether step length variation when increasing ambulation speed was related to disease progression. Patients with Parkinson's disease (N = 39) and controls(More)
BACKGROUND Motor evoked potentials (MEPs) are commonly used during surgery for spinal cord tumor resection. However, it can be difficult to record reliable MEPs from the muscles of the lower extremities during surgery in patients with preoperative weakness due to spinal cord compression. In this study, motor function of patients' lower extremities and their(More)