MRI of brain what does it indicate?
Magnetic resonance imaging – the most modern non-invasive diagnostic method that allows to see the biological tissue of the patient, regardless of the depth of their location. Non-invasive methods are characterized by the fact that their application does not require action on the skin of patients with needles or surgical instruments.
Why the study has become so popular in recent years and it is increasingly being prescribed to patients?
MRI obtained wide circulation in neurosurgery and neurology due to the following features:
In neurology and neurosurgery MRI has received such resonance due to the fact that is the «gold standard» in imaging disease of the brain. It often happens that no other method can not cope with the tasks that arise in front of the doctor-diagnostician. Quite difficult to make a diagnosis and begin treatment, if all that complains the patient is migraines, dizziness or loss of coordination.
In cases where the patient’s complaints are suggestive of pathology of the brain, but can treat a wide range of diseases, is assigned to review magnetic resonance imaging.
Look into the head — not the distant future, but a reality
The potential of MRI is that you can literally just search the head to the patient. It shows slices of the skull bones, brain, spine and spinal cord. If there are no clear indications that the pathology in the brain, checked other «units» of the nervous system.
Directly in the brain MRI shows gray and white matter, ventricles, sub space. The study shows the following pathologies:
- Malignant and benign formations of the brain.
- The violation of the integrity of the membranes of nerves (demyelination).
- Inflammatory foci and areas of edema.
- Dropsy of the brain.
- Bleeding in brain tissue.
- Of traumatic injury.
- Purulent fusion of tissues (abscesses).
- Areas of the symptoms of stroke hemorrhagic and ischemic type, that is, hemorrhagic and ischemic strokes.
- Neurinoma (benign tumor) of the auditory nerve.
- Pituitary neoplasms.
- Hematoma under the meninges.
MRI shows disease not being diagnosed in other ways: anomalies leading to displacement of the cerebellar tonsils and abnormalities of the corpus callosum, lesions of violation of the integrity of the membranes of nerve fibers in the cerebral white matter in multiple sclerosis. MRI is faster than CT become visible ischemia in any proportion, and this means that in stroke, it is possible to promptly start therapy. An important role for this study and the elucidation of the causes of socially significant diseases, dementia.
Contrast study – an even more perfect method?
It would seem, and so the high diagnostic potential of MRI can still improve through the use of contrast. If the blood-brain barrier of a patient without pathology, the contrast agent does not penetrate into the brain. In places where there is a violation of his integrity – the contrast substance enters the brain and causes the amplified signal. Therefore, gadolinium (usually used as contrast) immediately accumulates in malignant tumors and metastases that can be identified. And in demyelinating diseases gadolinium accumulates slowly, so after its introduction the patient study can be carried out only after 30-40 minutes.
The method is not for all: limitation of the study
MRI the patient is not at risk of exposure to ionizing radiation. However, to use magnetic resonance imaging there are contraindications. Thus, MRI is not performed if the patient has a metallic foreign body (ferromagnetic materials) in the orbit, the cranial cavity, the brain. Since in the study they are heated, this can lead to displacement and injury to nearby brain tissue. The probability of such bias is low, much greater importance is the fact that metal structures in the skull can create «artifacts» on the MRI scan. Such artifacts provoke a diagnostic error by a physician who interpretered the results of the study.
MRI is not used if the patient is installed external pacemaker. Pregnancy first trimester, a serious condition of the patient or claustrophobia are also contraindications.
Magnetic resonance imaging has several advantages over other methods of study. If the doctor prescribed you MRI, you can be sure that the cause of the disease will be discovered!