Chapter 5 Flashcards
Distribution the process of a contrast X-ray technique.
A substance is injected that absorbs X-rays either more or less than the surrounding tissue or a brain compartment. This heightens the contrast during the photography.
The brain photography method that collects 8-9 horizontal sections of the brain to create a three dimensional representation is called…
Computed tomography.
A brain photography method that uses measurement of waves emitted by hydrogen atoms is called…
Magnetic Resonance Imaging (MRI)
The brain photography method that uses oxygen flow to the blood in active areas of the brain is called…
Functional MRI (fMRI)
Spatial resolution
The ability to detect and represent differences in spatial location.
The first brain scan to provide functional rather than structural brain images is called…
Position Emission Tomography (PET)
PET requires the injection of what radioactive substance?
2-deoxyglucose
How is a PET scan carried out after the 2DG is injected?
The patient engages in a 30-second activity such as reading, and the brain scan will indicate the areas of the brain that were most active during the activity.
Ligands: what are they and what scan method are they used in?
Molecules that bond to other molecules, PET scans
An fMRI records what signal?
BOLD signal (blood-oxygen-level-dependent signal)
Temporal resolution and why it is a weakness in an fMRI
Temporal resolution is the specific timing of natural events. An fMRI image takes 2-3 seconds to produce while neural responses take mere milliseconds
The method of identifying pathways along which molecules rapidly diffuse is called…
Diffusion tensor imaging
Why is Diffusion tensor imaging useful?
It shows the connections among the brain structures, helping advance knowledge in how the brain works.
A technique used to turn off an area of the brain to asses effects on cognition and behavior is called…
Transcranial magnetic stimulation.
Cerebral angiography is a type of what technique?
Contrast X-ray technique
