Radiology

Question 1

Stroke protocol

Answer 1

Noncontract head CT
Profusion CT
CT angiogram

Question 2

Non-contrast ct

Answer 2

Blood, neoplasm, infarct are all contraindicated for tpa (brain is already dead)
Want to see normal midline, no blood

Question 3

Perfusion CT

Answer 3

Give bolus of contrast
Determine where blood flow is and how fast it travels w/ constant scanning
Generate maps of where blood is going by changes in each pixel

↑ time to start or time to peak & ↓ Blood volume= complete infarct
↑time to start or ↑ time to peak w/ ↑ Blood volume= brain at risk (want to save)

Question 4

↑ time to start or time to peak & ↓ Blood volume= _____________
↑time to start or ↑ time to peak w/ ↑ Blood volume= brain at risk (want to save)

Answer 4

complete infarct

Perfusion CT

Question 5

Ct angiogram

Answer 5

Using an intravenous contrast bolus and thin
sections moving through the anatomy depict
vascular anatomy

Question 6

CT of Infarcts

Answer 6

Confined to a vascular territory
1- 6 hours loss of gray matter density
6 hours – 4 days progressive swelling and hypodensity
4 – 14 days return towards normal density and volume
14 days on – varying degrees of hypodensity and volume loss

Question 7

MR Imaging Of Infarcts

Answer 7

1 hour – 10 days bright on diffusion weighted imaging
Swelling and increased signal on FLAIR and T2-weighted scans follows same pattern as swelling ang and low density on CT
DWI great for small infarcts and telling new from old

Question 8

↑ time to start or time to peak & ↓ Blood volume= complete infarct
↑time to start or ↑ time to peak w/ ↑ Blood volume= ___________________

Answer 8

brain at risk (want to save)

Perfusion CT

Question 9

CT of Infarcts

Answer 9

Confined to a vascular territory

1- 6 hours loss of gray matter density

6 hours – 4 days progressive swelling and hypodensity

4 – 14 days return towards normal density and volume

14 days on – varying degrees of hypodensity and volume loss

Question 10

MR Imaging Of Infarcts

Answer 10

1 hour – 10 days bright on diffusion weighted imaging

Swelling and increased signal on FLAIR and T2-weighted scans follows same pattern
as swelling ang and low density on CT

DWI great for small infarcts and telling new from old

Question 11

CT Angiography

Answer 11

technique used to visualize arterial and venous vessels throughout the body.