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    a brain-imaging method called ______________ takes advantage of the magnetic properties of different atoms to take sharp, three-dimensional images of the brain.

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    Magnetic Resonance Imaging (MRI)

    Learn about Magnetic Resonance Imaging (MRI) and how it works.

    Magnetic Resonance Imaging (MRI)

    What is MRI? How does MRI work?

    What is MRI used for?

    Are there risks?

    What are examples of NIBIB-funded projects in MRI?

    What is MRI?

    Magnetic Resonance Imaging (MRI) is a non-invasive imaging technology that produces three dimensional detailed anatomical images. It is often used for disease detection, diagnosis, and treatment monitoring. It is based on sophisticated technology that excites and detects the change in the direction of the rotational axis of protons found in the water that makes up living tissues.

    How does MRI work?

    MRI of a knee

    MRIs employ powerful magnets which produce a strong magnetic field that forces protons in the body to align with that field. When a radiofrequency current is then pulsed through the patient, the protons are stimulated, and spin out of equilibrium, straining against the pull of the magnetic field. When the radiofrequency field is turned off, the MRI sensors are able to detect the energy released as the protons realign with the magnetic field. The time it takes for the protons to realign with the magnetic field, as well as the amount of energy released, changes depending on the environment and the chemical nature of the molecules. Physicians are able to tell the difference between various types of tissues based on these magnetic properties.

    How Do X-rays Work?

    To obtain an MRI image, a patient is placed inside a large magnet and must remain very still during the imaging process in order not to blur the image. Contrast agents (often containing the element Gadolinium) may be given to a patient intravenously before or during the MRI to increase the speed at which protons realign with the magnetic field. The faster the protons realign, the brighter the image.

    What is MRI used for?

    MRI scanners are particularly well suited to image the non-bony parts or soft tissues of the body. They differ from computed tomography (CT), in that they do not use the damaging ionizing radiation of x-rays. The brain, spinal cord and nerves, as well as muscles, ligaments, and tendons are seen much more clearly with MRI than with regular x-rays and CT; for this reason MRI is often used to image knee and shoulder injuries.

    In the brain, MRI can differentiate between white matter and grey matter and can also be used to diagnose aneurysms and tumors. Because MRI does not use x-rays or other radiation, it is the imaging modality of choice when frequent imaging is required for diagnosis or therapy, especially in the brain. However, MRI is more expensive than x-ray imaging or CT scanning.

    One kind of specialized MRI is functional Magnetic Resonance Imaging (fMRI.) This is used to observe brain structures and determine which areas of the brain “activate” (consume more oxygen) during various cognitive tasks. It is used to advance the understanding of brain organization and offers a potential new standard for assessing neurological status and neurosurgical risk.

    Are there risks?

    Although MRI does not emit the ionizing radiation that is found in x-ray and CT imaging, it does employ a strong magnetic field. The magnetic field extends beyond the machine and exerts very powerful forces on objects of iron, some steels, and other magnetizable objects; it is strong enough to fling a wheelchair across the room. Patients should notify their physicians of any form of medical or implant prior to an MR scan.

    When having an MRI scan, the following should be taken into consideration:

    People with implants, particularly those containing iron, — pacemakers, vagus nerve stimulators, implantable cardioverter- defibrillators, loop recorders, insulin pumps, cochlear implants, deep brain stimulators, and capsules from capsule endoscopy should not enter an MRI machine.Noise—loud noise commonly referred to as clicking and beeping, as well as sound intensity up to 120 decibels in certain MR scanners, may require special ear protection.Nerve Stimulation—a twitching sensation sometimes results from the rapidly switched fields in the MRI.Contrast agents—patients with severe renal failure who require dialysis may risk a rare but serious illness called nephrogenic systemic fibrosis that may be linked to the use of certain gadolinium-containing agents, such as gadodiamide and others. Although a causal link has not been established, current guidelines in the United States recommend that dialysis patients should only receive gadolinium agents when essential, and that dialysis should be performed as soon as possible after the scan to remove the agent from the body promptly.Pregnancy—while no effects have been demonstrated on the fetus, it is recommended that MRI scans be avoided as a precaution especially in the first trimester of pregnancy when the fetus’ organs are being formed and contrast agents, if used, could enter the fetal bloodstream.

    Source : www.nibib.nih.gov

    [Solved] A Brain

    [Solved] A brain-imaging method called ______________ takes advantage of the magnetic properties of different atoms to take sharp,three-dimensional images of the brain. A)electroencephalography (EEG) B)magnetic resonance imaging (MRI) C)positron emission magnetography (PEM) D)computed tomography (CT)

    [Solved] A Brain-Imaging Method Called ______________ Takes Advantage of the Magnetic

    Question 123 Multiple Choice Question 123

    A brain-imaging method called ______________ takes advantage of the magnetic properties of different atoms to take sharp,three-dimensional images of the brain.

    A)electroencephalography (EEG)

    B)magnetic resonance imaging (MRI)

    C)positron emission magnetography (PEM)

    D)computed tomography (CT)

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    Ch. 2 Quiz questions Flashcards

    Study with Quizlet and memorize flashcards terms like magnetic resonance imaging (MRI), computed tomography (CT), electroencephalography (EEG) and more.

    Ch. 2 Quiz questions

    magnetic resonance imaging (MRI)

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    A brain-imaging method called ______________ takes advantage of the magnetic properties of different atoms to take sharp, three-dimensional images of the brain.

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    computed tomography (CT)

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    A brain-imaging method that takes computer-controlled X-rays of the brain is called

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    1/12 Created by danielle_jones461

    Terms in this set (12)

    magnetic resonance imaging (MRI)

    A brain-imaging method called ______________ takes advantage of the magnetic properties of different atoms to take sharp, three-dimensional images of the brain.

    computed tomography (CT)

    A brain-imaging method that takes computer-controlled X-rays of the brain is called

    electroencephalography (EEG)

    A brain-imaging method using radio pulses and magnetic fields of the body to produce detailed images of the brain is called ________.

    neuron

    A specialized cell that makes up the nervous system that receives and sends messages within that system is called a ________.

    occipital

    After a head injury, a person reports that she is unable to see, although her eyes are uninjured. A doctor would suspect an injury in the ________ lobe

    amygdala

    As Joe walks to his car late at night, he hears footsteps behind him. Feeling afraid, Joe grips his keys and quickens his pace. It is likely that Joe's ________ has been activated.

    Broca's

    Bill was admitted to the hospital last week after he fell. When Bill's son visited, he found that his father was unable to get words out in a smooth, connected fashion. If Bill's difficulty speaking is due to brain damage, what is the likely location of the damage?

    autonomic

    Involuntary muscles are controlled by the ________ nervous system

    cerebellum

    If your ________ was damaged, you might walk oddly and have trouble standing normally

    the brain and spine

    The central nervous system consists of

    Parkinson's

    Deep brain stimulation is used often to treat

    Positron emission tomography (PET)

    brain imaging method in which a radioactive sugar is injected into a person and a computer compiles a color-coded image of the activity of the brain

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