mri, the head…

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what the risks are brain, mri scans, lobes, the brain, nuclear magnetic resonance, cranial, magnetic resonance imaging, cranial, head mri scan, mri, cranial, nmr, cranial, cranial mri, an mri, the head, non-invasive procedure, uses powerful magnets, radio waves to construct clear, detailed pictures of brain tissues, unlike conventional radiography, computed tomography, ct, make use of potentially harmful x-rays passing, a patient to generate images, mri imaging, the magnetic properties of atoms, a powerful magnet generates a magnetic field roughly 10,000 times stronger than the earth's, a very small percentage of hydrogen atoms, align, field, "nuclear", in the original name, nuclear magnetic resonance imaging, seldom used, refers, proton, in the nucleus, the hydrogen atom, does not imply radioactivity, focused short radio wave pulses, broadcast towards the aligned hydrogen atoms in tissues of interest, return a signal of own, subtle differences in that signal from dissimilar tissues enables the mri to differentiate between various organs, potentially, provide contrast between benign, malignant, cancerous, tissue, imaging plane, slice, projected, stored, computer, printed on film, mri is performed, clothing, bones, certain types of metal in, around the area of interest, cause significant errors, in the reconstructed images, errors, artifacts, mri makes use of radio waves very close in frequency to those of ordinary fm radio stations, scanner must be located, a specially shielded room to avoid outside interference, lie on a narrow table which slides into a large tunnel-like tube, the scanner, a small device placed around the head, special body coil which send, receive the radio wave pulses, designed to improve the quality, the images, contrast, administered, intravenous access, small vein, the hand, forearm, a technologist, operate the machine, observe, entire study, adjacent room, several sets of images, each taking from 2 to 15 minutes, a complete scan, take up to 1 hour, newer scanners, more powerful magnets utilizing updated software, advanced sequences, complete the process in less time, no preparatory tests, diets, medications, fast, 6 hours, scan, must sign a consent form, the scan, the strong magnets, no metallic objects, allowed, in the room, items jewelry, watches, credit cards, hearing aids damaged by the strong magnets, pins, hairpins, metal zippers, similar metallic items, distort the images, frequent exposure to ferrous metals, sheet metal worker has, make mri difficult, a hospital gown recommended, allowed to wear a sweatsuit, similar clothing, metal fasteners, take out removable dental work, scan, infants, children, test depends on child's age, level of trust, prepare child, infant test, procedure preparation, birth to 1 year, toddler test, procedure preparation, 1 to 3 years, preschooler test, procedure preparation, 3 to 6 years, schoolage test, procedure preparation, 6 to 12 years, adolescent test, procedure preparation, 12 to 18 years, no pain, magnetic field, radio waves, not felt, primary discomfort, claustrophobic feeling that some people experience from inside the scanner, table hard, cold, request a blanket, pillow, machine produces loud thumping, humming noises, ear plugs, given to reduce the noise, a technologist observes, entire procedure, enter the room to speak to you, speak, an intercom, in the scanner, excessive movement, blur mri images, have difficulty lying still, very anxious, given a sedative, viewing of some brain lesions, require use of a dye injected, veins, no recovery required, have been sedated, after an mri scan, resume normal diet, medications, mri provides detailed pictures, the brain, nerve tissues from multiple planes, obstruction by overlying bone, in fact, 90% of all mri scans, brain, spine disorders, mri, procedure of choice, most brain disorders, mri is particularly useful in brain, neurologic disorders, clearly show various types of nerve tissue, provides clear pictures, the brainstem, posterior brain, difficult to view on ct scan, the diagnosis of demyelinating disorders, disorders multiple sclerosis that cause destruction, the myelin sheath, the nerve, mri, noninvasive procedure, evaluate blood flow, flow of cerebrospinal fluid, csf, mri, distinguish tumors, lesions from normal tissues, mri is sometimes, avoid the dangers of angiography, repeated exposure to radiation, sensitivity of an mri depends, in part, on the experience, the radiologist, an mri, the head, reveal disorders, primary brain tumors, metastatic brain tumors, structural abnormality, the brain, ventricles, pituitary gland, pituitary masses, lesions, masses, location, acoustic neuroma, optic glioma, arteriovenous malformations, the head, brain aneurysms, damage to basal ganglia, subdural hematoma, blood clots, intracranial hemorrhage, than 48 hours old, radiation damage, brain, brain swelling, demyelinating diseases, infarction, tissue destruction, brain abscess, abnormalities of blood flow, carotid artery stenosis, additional conditions under which the test performed, acromegaly, amyotrophic lateral sclerosis, throat cancer, chronic subdural hematoma, cushing's syndrome, deep intracerebral hemorrhage, delirium, dementia, dementia, due to metabolic causes, diabetes insipidus, central, hemorrhagic stroke, huntington's disease, hypertensive intracerebral hemorrhage, hypopituitarism, intracerebral hemorrhage, lobar intracerebral hemorrhage, melanoma, the eye, meniere's disease, multi-infarct dementia, multiple endocrine neoplasia, men, i, multiple sclerosis, normal pressure hydrocephalus, nph, partial, focal, seizure, partial complex seizure, petit mal seizure, pituitary cushing's, cushing's disease, prolactinoma, reye's syndrome, senile cerebral amyloid angiopathy, senile dementia/alzheimer's type, acute sinusitis, chronic sinusitis, stroke, stroke secondary to atherosclerosis, stroke secondary to cardiogenic embolism, stroke secondary to fmd, stroke secondary to syphilis, temporomandibular joint, tmj, syndrome, toxoplasmosis, transient ischemic attack, tia, wernicke-korsakoff syndrome, wilson's disease, no ionizing radiation involved in mri, have been no documented significant side effects, the magnetic fields, radio waves used on the human body to date, people have been harmed in mri machines, did not remove metal objects from clothes, metal objects were left, in the room by others, the effects of strong magnetic fields on a fetus, not well documented at this time, pregnant women, advised to avoid mri scans, most common intravenous contrast agent, gadolinium, very safe, there have been documented allergic reactions to it, an extremely rare occurrence, sedation is used, associated risks of over-sedation, technologist monitors the patient's vital signs, heart rate, respiration, mri is superior to computed tomography, ct, in most cases where differentiation of soft tissues, view organs, obstruction by bone, foreign bodies, capable of showing the tissues from multiple viewpoints, noninvasive way to evaluate blood flow, a ct scan preferred, acute trauma, the head, face, acute, less than 72 hours, neurologic dysfunction, early symptoms of stroke, subarachnoid, intracranial hemorrhage, the first 24, 48 hours, skull bone disorders, disorders involving the bones, the ear.