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Objective To explore the applied value of high-field intraoperative magnetic resonance imaging (iMRI) in multi-image fusion guided stereotactic brain biopsy.Methods Twenty-four patients with intracranial lesions were examined by conventional MRI and diffusion tensor imaging (DTI) with 1.5T iMRI system before operation in our hospital from June 2011 to April 2012.The digital image data and preoperative PET/CT image data were transferred into BrainLAB planning workstation and all kinds of images were automatically fused.We used the BrainLAB software to reconstruct the corticospinal tract (CST) and three-dimensional display the anatomic relationship of CST and brain lesions.Leksell surgical planning workstation was used to help to choose the best target site and the reasonable needle track.The 1.5T iMRI was used to effectively monitor the intracranial condition during brain biopsy procedure.Results Needle biopsies were successfully performed in all 24 patients and pathological diagnosis was explicitly obtained in 23 patients,leading to a diagnostic yield of 95.8％.No patient suffered from significant complications during or after surgery.Conclusions With the help of high-field iMRI,multi-image fusion guided stereotactic brain biopsy conduces to achieving the purpose of higher positive rate of biopsy and lower incidence of complications.The method with this design combining MRI-DTI fusion images with the frame-based stereotactic biopsy can play a significant role in intracranial lesions of deep functional areas.
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Objective To study the temporal expression pattern of hepatocyte growth factor (HGF) in the brain tissue of rats after traumatic brain injury (TBI) and provide evidence for HGF-targeted interventions for TBI. Methods Ninety-six Wistar rats were randomly divided into 8 groups including a sham-operated group and 7 TBI groups (n=12) examined at 2, 6, 12, 24, 72, 168 and 336 h after to fluid percussion injury of the brain. Each group was randomized into two subgroups (n=6), one for examining HGF expression and neuropathological changes in the brain with immunohistochemistry and HE staining, and the other for detecting the expression of HGF mRNA using RT-PCR. Results HGF expression increased at both the protein and mRNA levels after TBI. The number of HGF-positive cells began to increase on the margin of the injured area 24 h after the injury till reaching the peak level at 168 h. At 336 h after the injury, the number of HGF-positive cells declined but still maintained a high level. The expression of HGF mRNA began to increase 72 h after injury and reached the peak level at 168 h. Conclusion As a neurotrophic factor and an angiogenic factor, HGF may contribute to neuronal protection and nerve tissue repair and regeneration after TBI.
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<p><b>OBJECTIVE</b>To study the therapeutic effect of nimodipine on experimental brain injury.</p><p><b>METHODS</b>Experimental and control rabbits were subjected to a closed head injury. In one group nimodipine was given intravenously and the effect evaluated by electron microscopy, brain water content, calcium levels, transcranial Doppler, and intracranial pressure monitoring.</p><p><b>RESULTS</b>In rabbits treated with nimodipine the level of neuronal cytosolic free calcium was markedly decreased. There were less cellular damage and less spasm of the middle cerebral artery seen on electron microscopy. No difference regarding intracranial pressure changes between the two groups was noted.</p><p><b>CONCLUSIONS</b>Nimodipine has a protective action on brain injury by blocking a series of pathological reactions induced by neuronal calcium overload, and by reducing the spasm of brain vessels and improving cerebral blood flow.</p>