Neuroradiologic Anatomy

Question 1

compare contrasts used in CT vs MRI

Answer 1

CT: iodinated
MRI: gadolinium

Question 2

CT vs MRI: which needs to scan multiple times?

Answer 2

MRI

Question 3

CT vs MRI: ___ uses “pulse sequences” and ___ uses different “windows”

Answer 3

MRI; CT

Question 4

what is MRI better than CT for?

Answer 4

imaging soft tissues (including bone marrow, intervertebral discs, ligaments, nerves, or cord injuries)

Question 5

rank elements on CT from brightest to darkest

Answer 5

bone, hemorrhage, gray matter, white matter, CSF, fat, air

Question 6

rank elements on MRI T1WI from brightest to darkest

Answer 6

fat, white matter, gray matter, CSF, air/cortical bone

Question 7

rank elements on MRI T2WI from brightest to darkest

Answer 7

CSF, fat, gray matter, white matter, air/cortical bone

Question 8

which imaging modality shows white matter as brighter than gray matter?

Answer 8

MRI T1WI

Question 9

which imaging modality shows CSF as brightest element?

Answer 9

MRI T2WI

Question 10

what gyrus is shaped like a greek “omega” on axial plane of the brain?

Answer 10

precentral gyrus (contains homunculus; bump is hand)

Question 11

MRI T1WI: ______ are bright, _____ are dark

MRI T2WI: ______ are bright, _____ are dark

Answer 11

fat and brain; CSF and air

fat and CSF; bone and air

Question 12

MRA: use

Answer 12

aneurysms and stenosis; no dye or radiation

Question 13

imaging steps for evaluation of acute stroke

Answer 13

1. CT to look for hemorrhage

2. CTA to look for source ofe bleeding

Question 14

CT will not show any findings in what kind of stroke?

Answer 14

early acute ischemic stroke