Introduction to Neural Imaging Flashcards
scan that produces images of the CNS in sections that have a reasonably high resolution with differentiation of grey & white matter structures
MRI
2 primary types of MRI’s
- T1 - fast resonance
- T2 - fast resonance
fields are enhance by radio frequency pulse
T1 - fast resonance (MRI)
fields are canceled by radio frequency pulse
T2 - slow resonance (MRI)
what white matter looks like in T1 MRI
light grey
what white matter looks like in a T2 MRI
dark grey
enhanced tumor in a T1 MRI is what color?
white
enhanced tumor in a T2 MRI is what color?
rarely done
dark grey
edema (blood) in a T1 MRI is what color?
edema (blood) in a T2 MRI is what color?
light grey to white
grey matter in a T1 MRI is what color?
dark grey
grey matter in a T2 MRI is what color?
light grey
fat in a T1 MRI is what color?
white
fat in a T2 MRI is what color?
grey
CSF in a T1 MRI is what color?
very black
CSF in a T2 MRI is what color?
very white
___ is very black in a T1 & T2 MRI
bone & air
__ is dark grey in a T1 & T2 MRI
muscles
___ is dark grey in a T1 MRI
acute infarct, subactue infarct, acute ischemia, subacute ischemia
___ is light grey to white in a T2 MRI
acute infarct, subactue infarct, acute ischemia, subacute ischemia
variable color for a T1 & T2 MRI is what
tumor
substance that allows visualization of the vascular pattern in the brain and also enhances tumors that lack a blood brain barrier
gadolinium compound
visualization of myelinated axonal pathways in the brain and spinal cord
Diffusion Tensor Imaging
Detects radioactive precursors introduced into the brain
SPECT/PET (single photon/positron emission computed tomography)
Flow of blood can be detected with MRI from paramagnetic effects of what?
deoxygenated hemoglobin
Radioactive substance that emits a position on decay
PET Scan
looking from the patient’s feet
Axial observer
looking at the patients face
Coronal observer
Cerebral Vasculature can be imaged by
MRI and cerebral angiography
