Define 1
x-ray
2D structural image created by differential radiation absorption in different tissues
What are the three types of MRI?
T1-weighting, T2 or diffusion weighting, and Diffusion Tensor Imaging (DTT)
x-ray
useful for imaging skull fracture and foreign objects
T1 weighting
with a contrast dye.
useful for evaluating brain tumor, ischemia, hemorrhage, and infection or inflammation.
also useful for examining major structural anomalies
fMRI is a type of what
MRI scanning
CT scan
computed tomography scan; scan that acquires large series of 2D x-ray images. computer processing creates a 3D image of the inside of an object. may be used with dye
EEG
electroencephalogram; uses electrodes placed either above or below the scalp that records electrical activity in the brain
CT scan
useful for quick viewing of skull fractures, stroke, bleeding, and brain swelling
T2 or Diffusion weighting
without contrast dye.
useful for evaluating brain tumor, ischemia, stroke, chanfes in myelination, chronic epilepsy, scarring, and edema
water appears bright
ECoG is a type of what
EEG
MRI
structural magnetic resonance imaging
ECoG
electrocorticography; type of EEG that places the electrodes DIRECTLY onto the brain. highly invasive direct measurement
EEG
useful for evaluating seizures, level of arousal, delirium, and brain death
Diffusion Tensor Imaging
type of T2 diffusion weighting which makes it possible to estimate the location, orientation, and anisotropy of the brain's white matter tracts (measures white matter tracts)
MRI vs fMRI (what is it)
MRI - structural magnetic resonance imaging; there are 3 types. T1-weighting, T2 or diffusion weighting, and Diffusion Tensor Imaging (DTT)
fMRI - MRI scanning that detects changes in blood flow in the brain to see which areas are functionally active, indirect measurement
fMRI
MRI scanning that detects changes in blood flow in the brain to see which areas are functionally active
indirect measurement
What is one thing that fMRI can detect early? (from quizlet yea)
dementia
fMRI
functional MRI; useful for detecting early stroke and cognitive disorders
structural imaging (6)
x-ray, CT scan, T1 weighted, T1 weighted with dye, T2 diffusion weighted, DTI
Difference between T1 weighting and T2 weighting
T1 - with contrast dye
T2 - without contrast dye
PET scan
positron emission tomography scan; measures metabolism by using radioactively tagged metabolic molecules that have been injected into the bloodstream.
indirect measurement
is Diffusion Tensor Imaging a type of T1 or T2 diffusion weighting?
T2
PET scan
useful for disorders that have metabolic problems, such as dementia, stroke, and brain tumor
What is useful for evaluating edema and chronic epilepsy?
T2 or Diffusion Weighting
What is more useful for evaluating major structural anomalies?