- It is expensive compared to other scans.
- The patient has to stay still to capture clear images.
- Patient’s movements can affect the quality of images.
What are the advantages and disadvantages of an fMRI?
The big advantage of fMRI is that it doesn’t use radiation like X-rays, computed tomography (CT) and positron emission tomography (PET) scans. If done correctly, fMRI has
virtually no risks
. It can evaluate brain function safely, noninvasively and effectively.
What is one disadvantage of MRI as a brain imaging technique?
Disadvantages:
Expensive to use. Cannot be used in patients with metallic devices, like pacemakers
. Cannot be used with uncooperative patients because the patient must lie still.
What is an fMRI good for?
It may be used
to examine the brain’s functional anatomy
, (determine which parts of the brain are handling critical functions), evaluate the effects of stroke or other disease, or to guide brain treatment. fMRI may detect abnormalities within the brain that cannot be found with other imaging techniques.
What are the disadvantages of fMRI?
- It is expensive compared to other scans.
- The patient has to stay still to capture clear images.
- Patient’s movements can affect the quality of images.
Why is fMRI bad?
2) fMRI
studies go wrong
not just because of the limitations of the tool. They go wrong because science, overall, has flaws. With fMRI, scientists began to chart an atlas of the brain and its function. They confirmed that there was a specific area of the brain devoted to interpreting faces.
What is the advantage of fMRI over pet?
An fMRI scan
can produce images of brain activity as fast as every second
,whereas PET usually takes 40 seconds or much longer to image brain activity. Thus, with fMRI, scientists can determine with greater precision when brain regions become active and how long they remain active.
What is the difference between EEG and fMRI?
As we have already noted, EEG signals are directly related to neuronal processing, whereas
fMRI responses arise from subsequent changes in blood- oxygenation levels
. There are other important differences as well that are rele- vant for combining the two types of data.
How does an fMRI actually work?
Copyright: FMRIB Centre Functional magnetic resonance imaging, or FMRI, works by
detecting the changes in blood oxygenation and flow that occur in response to neural activity
– when a brain area is more active it consumes more oxygen and to meet this increased demand blood flow increases to the active area.
Why is fMRI so popular?
The popularity of fMRI derives
from its widespread availability
(can be performed on a clinical 1.5T scanner), non-invasive nature (does not require injection of a radioisotope or other pharmacologic agent), relatively low cost, and good spatial resolution.
What is the best brain imaging technique?
Magnetic resonance imaging (MRI)
and functional magnetic resonance imaging (fMRI) scans are the form of neural imaging most directly useful to the field of psychology.
What is the best type of brain scan?
Imaging tests. Your doctor may order one or more imaging tests. These tests use x-rays, strong magnets, or radioactive substances to create pictures of the brain and spinal cord. Magnetic resonance imaging (MRI) and
computed tomography (CT) scans
are used most often to look for brain diseases.
Is MRI better than EEG?
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.
Why is fMRI better than MRI?
FMRI
creates the images or brain maps of brain functioning
by setting up and utilizing an advanced MRI scanner in such a way that increased blood flow to the activated areas of the brain shows up on the MRI scans. The MRI scanners do not actually detect blood flow or other metabolic processes.
Can fMRI read your mind?
For cognitive neuroscientists, who study mental processes, fMRI was a godsend: It made
it possible to identify which parts of the brain react
to, say, faces, words or smells. It was a window through which to see the brain making sense of the external world.
What questions can fMRI answer about the brain?
Question 1: Which (if any) functions can be localized to specific brain regions? Question 2: Can markers of mental
process
X be found during task Y? Question 3: How distinct are the representations of different stimuli or tasks? Question 4: Do two tasks X and Y engage common or distinct processing mechanisms?
