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Flashcards in Neuro Imaging Deck (46)
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1

CT/ CAT scans accepted imaging for what?

imaging modality for evaluation of the entire body

2

CT/ CAT scan uses?

Thousands of narrow beam x rays that pass at different angles

3

CT/ CAT scan looks at?

Structures rather than functions

4

Attenuated data is summed up from thousands of angles used in a process called

reconstruction

5

Can small structures be seen in CT/CAT?

nope

6

what is used to detect brain diseases

CT/ CAT Scan

7

contrast dye can be used in CT/CAT scans for?

detect organs

8

On CT/CAT scan Bones are

white

9

On CT/CAT scan gases and liquids are?

black

10

On CT/CAT scan tissues are?

gray

11

Tomographic image ?

picture of a slab of the pt’s anatomy

12

what does MRI stand for

Magnetic Resonance Imaging

13

MRI magnetic field is ________ times as strong as earth’s magnetic fields

60,000x

14

Atom that MRI uses?

hydrogen

15

What is the resonance bit for MRI

Nuceli are hit by pulsing radio waves, this RF makes the protons spin at a particular frequency, in a particular direction

16

MRI diagnosing

MS, Stroke, infections of the brain/ spine/ CNS, Tendonitis

17

MRI visualizing

Injuries, torn ligaments

18

MRI evaluating

Masses in soft tissues, cysts, bone tumors or disc problems

19

Advantages of MRI

-Does not use Ionizong radiation
-Contrast dye has low chance of side effects
-Non invasive
-Provides comparable resolution with far better contrast resolution (ability to distinguish the differences between two arbitrarily similar but not identical tissues)

20

Contraindications of MRI

-Pacemaker
-Metal objects in body

21

Top two MRI images

T1WI & T2WI

22

T1WI detects water and fluid containing tissues as

DARK

23

T1WI detects fat containing tissues as

Bright

24

T2WI detects water & fluid containing tissues as

Bright

25

T2WI detects fat containing tissues as

DARK

26

T1WI are used more for

Fluid, swelling, blood

27

T2WI are good at finding

Pathology

28

what does MRA stand for ?

Magnetic Resonance Angiography

29

What are MRA used for?

-images blood vessels
- stenosis & aneurysms

30

fMRI is done when?

while pt performs a task

31

fMRI is

functional

32

fMRI displays

Metabolically active tissue,

33

fMRI utilizes oxygen uptake as a measure of

brain activity

34

Strengths of fMRI

-Non-invasive, replicable
-Potentially good spatial localization
-Common, well-validated technique

35

Limitations of fMRI

-Mediocre temporal resolution (seconds)
-Complex, highly variable data analyses
-Expensive and time-consuming

36

what detects electrical activity in the brain?

EEG

37

What diagnosing EPILEPSY

EEG

38

What is used to diagnose sleeping disorders

EEG

39

what 3 ares does EEG help identify intervention

-lobectomy
-Cortical excision
-Hemispherectomy

40

Lobectomy

removes part of the lobe of a brain (temporal)

41

Cortical excision

removes outer layer of the cortex

42

hemispherectomy

remove outer layer and anterior temporal lobe on one half of the brain

43

What injects Tracers?

PET scan

44

PET scans detects

Glucose metabolism, cancer, dementia, seizures, map brain function

45

Strengths of PET scan

-Uses a simple physiological mechanism
-Provides absolute, quantitative data
- Allows imaging of anything that can be tagged

46

Limitations of PET Scan

-Poor temporal resolution (many minutes)
-Poor spatial resolution (several centimeters)
-Requires injection of radioactive material