CT MRI

Question 1

Cortical bone appears

Answer 1

white

Question 2

Cancellous bone

Answer 2

gray

Question 3

Dense structures appear

Answer 3

white or light shade of gray

Question 4

Less dense appears

Answer 4

dark

Question 5

Volume averaging

Answer 5

radiodensity of voxel represent sum of densities of tendon and bone

Question 6

Which slices are less affected by volume averaging and therefore have better contrast

Answer 6

thinner

less information and results in loss of image quality

Question 7

How is axial image representing a transverse slice displayed?

Answer 7

as if patient were in supine position and viewer looking in caudocephalad direction

Question 8

What is the level of the window?

Answer 8

narrow window setting chosen, with central value representing average attenuation of brain tissue

Question 9

What slices require greater radiation and increase the duration of examination and increase number of slices=increasing total radiation dose

Answer 9

thin slices

Question 10

T1

Answer 10

fat

Question 11

T2

Answer 11

water- valuable for detecting inflammation

Question 12

MRI is sensitive for detecting changes and variations in:

Answer 12

bone marrow
excels in display of soft tissue detail
disk herniation/ nerve root impingement
stage neoplasms