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Flashcards in CT MRI Deck (12)
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1

Cortical bone appears

white

2

Cancellous bone

gray

3

Dense structures appear

white or light shade of gray

4

Less dense appears

dark

5

Volume averaging

radiodensity of voxel represent sum of densities of tendon and bone

6

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

thinner
less information and results in loss of image quality

7

How is axial image representing a transverse slice displayed?

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

8

What is the level of the window?

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

9

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

thin slices

10

T1

fat

11

T2

water- valuable for detecting inflammation

12

MRI is sensitive for detecting changes and variations in:

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