what is an advantage of an eeg over an mri or ct scan course hero

In general, MRI is good at telling us where the lesion is, whereas EEG is good at separating normal and abnormal primarily cortical function. The topologic usefulness of EEG is limited, although it may be improved with computerization. What advantage does EEG have over fMRI quizlet?

Full Answer

How does EEG work?

The brain is an electrical system – all of our thoughts (conscious or otherwise) are generated through a network of neurons, that send signals to each other with the help of electrical currents. The more electrical signals, the more neuronal communication, which corresponds to more brain activity.

What are the drawbacks of EEG?

A drawback for EEG is the spatial resolution – as the electrodes measure electrical activity at the surface of the brain, it is difficult to know whether the signal was produced near the surface (in the cortex) or from a deeper region.

What is EEG?

EEG (electroencephalography) measures the electrical activity of our brain via electrodes that are placed on the scalp. It tells us, from the surface measurements, how active the brain is.

What about fMRI?

If I want to move my right arm, a few things need to happen. A certain part of my brain will increase its activity to send the message to complete this action, and that area of the brain will receive ever-so-slightly more oxygen-rich blood.

How do they all compare?

As we’ve learnt above, there are several differences in how the brain imaging information is provided by each technology.

What is the best method to measure brain function?

For quicker, affordable, and accessible insights about brain function, with a tight temporal resolution, EEG is the method of choice.

What happens to the protons when the radio pulse is emitted?

For the next step, a radio pulse is emitted (just like a normal radio signal, just much quicker). This also interacts with the protons, essentially turning them to the side. But, as the radio frequency only happens for a moment, the protons relax back to their aligned state before.

What is the difference between MRI and CT scan?

The difference between an MRI and CT scan. CT scans and MRIs are both used to capture images within your body. The biggest difference is that MRIs (magnetic resonance imaging) use radio waves and CT (computed tomography) scans use X-rays. While both are relatively low risk, there are differences that may make each one a better option depending on ...

What is an MRI?

An MRI is highly adept at capturing images that help doctors determine if there are abnormal tissues within the body. MRIs are more detailed in their images.

What is the noise of an MRI?

An MRI is a loud machine. Typically, you’ll be offered earplugs or headphones to make the noise more bearable. You’ll also be asked to lie still while the MRI is taking place.

What is a CT scan?

CT scans are sometimes called CAT scans. A CT scan is typically used for: bone fractures. tumors. cancer monitoring. finding internal bleeding. During a CT scan, you’ll be asked to lie down on a table. The table then moves through the CT scan to take cross-sectional pictures inside your body.

What are radio frequency tests used for?

They’re frequently used to diagnose issues with your: joints. brain. wrists. ankles. breasts. heart. blood vessels. A constant magnetic field and radio frequencies bounce off of the fat and water molecules in your body.

Is a CT scan a risk?

Both CT scans and MRIs pose some risks when used. The risks are based on the type of imaging as well as how the imaging is performed.

Should I consult a doctor before an MRI?

You should consult a doctor prior to an MRI if you have implants including: