Lecture 4 and 8 - Imaging

Question 1

for CT and X-ray, the property that allows us to visualize differences is ____ _____

Answer 1

electron density

Question 2

CT of the brain without contrast is used as a _____ tool ie for headaches. it is more sensitive to ____ hemorrhage

Answer 2

screening;

acute

Question 3

bone and fresh blood are _____ on non-contrast CT;

CSF and old blood are _____

Answer 3

white;

dark grey

Question 4

what color are fat and air on non-contrast CT?

Answer 4

black

Question 5

CT with contrast:
used to evaluate ____ (more sensitive to acute);
also detects changes in the BBB, so can be used for ____ or ____ processess

Answer 5

stroke;
inflammatory, neoplastic

good for evaluating vascular structures, cystic things

Question 6

in non-acute conditions, what type of CT is prefferred?

Answer 6

with contrast

Question 7

CXR is a good ___ test

Answer 7

screening

Question 8

if a heart is more than ___ the width of the chest on CXR, it is enlarged

Answer 8

half

Question 9

because contrast contains iodine, what organ appears white with a CT with contrast?

Answer 9

thyroid

Question 10

calcium (ie atherosclerosis) is ____ on CT

Answer 10

white

Question 11

what is the most sensitive part of the body to radiation?

Answer 11

lens

Question 12

2 absolute contraindications to MRI?

Answer 12

pacemaker, metal in spine/eye;

aneurysm clip