Brain Imaging Lec 11 Flashcards Preview

Neuro U3 > Brain Imaging Lec 11 > Flashcards

Flashcards in Brain Imaging Lec 11 Deck (17)
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1
Q

CT enhances visualization of

A

Bony anatomy
Acute hemorrhage or stroke
Generalized atrophy
Elements with high atomic numbers show up better

2
Q

CT advantages

A
Fast
Initial screening and assessment
Bone imaging
Hemorrhage detection
Pt flexibility
3
Q

CT disadvantages

A

Use of Xray
Not as good for soft tissue as MRI
Low spatial resolution

4
Q

Head CT

A
Infarction- hypodense
Tumors- swelling or edema surrounding
Calcifications- hyperdense
Hemorrhage- hyperdense
Bone trauma- hyperdense
5
Q

MRI measurements provided

A

Brain structure
Vasculature
Chemical structure
Fiber tracts

6
Q

MRI disorders

A

Neoplasm
Demyelination- MRS
Degenerative diorders- cortical atrophy

7
Q

MRI advantages

A

High spatial resolution
No radiation
Excellent contrast

8
Q

MRI disadvantages

A

Long study time
No ferromagnetic or electronic devices
Claustrophobic

9
Q

Tesla

A

Increase resolution and signal/noise

  • T1- fast RF pulse
  • T2-slow RF pulse- water or path tissue
10
Q

MRS

A

Separates our components of chemical mixtures in brain

-used to compare normal to tumor tissue in brain

11
Q

Diffusion tensor imaging

A

Visualization of white matter
water movement along axis
smaller coefficient- pathology
- can measure myelin integrity

12
Q

fMRI

A

measure brain fxn in vivo

measure blood oxygen during activity

13
Q

PET Measurements provided

A

Perfusion
Metabolism
NT integrity

14
Q

PET disorders

A

Psychiatric/addictive/degenerative

epilepsy

15
Q

PET advantages

A

Functional imaging

Physiological variables can be determined

16
Q

PET disadvantages

A

Ionizing radiation
Costly, limited access
Tracer production

17
Q

Other uses for PET

A

Grading tumors and determine their prognosis

  • Necrosis-hypometabolic
  • Tumor recurrence- hypermetabolic