Magnetic Resonance Imaging (Mri) With Neurological Disorders

MRI provides a better representation of the neural structures than CT. This difference is clinically most significant if the following is made visible: cranial nerve brainstem lesions abnormalities of the posterior fossa spinal CT images of these regions are often marred by bony streak artifacts. An MRI is particularly valuable in the identification of spinal diseases (for. Example, tumor, abscess) that compress the spinal cord and require emergency moderate intervention. Likewise, the MRT is better suited for the detection of demyelinating plaques earlier infarcts and subclinical cerebral edema, cerebral contusion and incipient transtentorieller entrapment, abnormalities of the craniocervical junction and syringomyelia. MRI is contraindicated if patients Hatten have a pacemaker or cardiac or carotid stent for <6 weeks ferromagnetic aneurysm clips or other metallic object in the body that can be either overheat or deploy when the body exposed to an intense magnetic field is. For visualization of inflammatory, demyelinating and neoplastic lesions of the signal gain may be required by i.v. paramagnetic contrast agents (eg. As gadolinium). Although gadolinium is considered much safer as a contrast agent used in CT have been reported nephrogenic systemic fibrosis (nephrogenic fibrosing dermopathy) in patients with impaired renal function and acidosis. There are various MRI techniques; which is selected depends on the specific tissue, on the location and the suspected fault: Diffusion-weighted MRI (DW-MRI) allows rapid and early detection of ischemic stroke. With the perfusion MRI Hypoperfusionsareale for early ischemic stroke can be recognized. However, areas with benign hypoperfusion can not be reliably distinguished from those with malicious hypoperfusion, leading to a heart attack. , the diffusion tensor imaging (DTI) is an extension of DW-MRI, the white matter tracts 3-dimensional represent (tractography). It can be used to monitor the integrity of CNS pathways that are affected by aging and disease. The double inversion recovery (DIR) used in research centers is superior to other MRI techniques in the detection of demyelination of gray matter; Today demyelination of gray matter is seen in multiple sclerosis as widespread. The functional MRI (fMRI) shows which regions of the brain are activated by a particular cognitive or motor task (indicated by the enhanced flow of oxygenated blood); However, the clinical use must be defined more precisely. The MRI angiography (MRA) uses the MRI with or without contrast agent to represent cerebral vessels and large arteries and their branches in the head and neck. Although the MRI does not replace the cerebral angiography, it is used when a cerebral angiography can not be performed (eg. B. because the patient refuses or increased risks has). When Insultdiagnostik with MRA the severity of arterial stenosis tends to be represented rather too highly, but so often do not see a disease of the large arteries. The MRI angiography can also be used to represent the large veins and dural sinus of the brain. The MRA can make a cerebral angiography in the diagnosis of sinus thrombosis unnecessary and is useful for monitoring thrombolysis and when deciding on the duration of anticoagulation. MR spectroscopy can measure metabolites of brain metabolism regionally quantitatively and thus distinguish tumors from abscesses or insults.

Health Life Media Team

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