Intro To Medical Imaging

Question 1

Air is what color in x-ray

Answer 1

Black

Question 2

The whiter the density, means what

Answer 2

The greater the thickness

Question 3

AP view shows what

Answer 3

Magnification of the heart

Question 4

Ap view is less preferred when

Answer 4

When you want to get a good look of the heart (thorax)

Question 5

CT always looks in what direction

Answer 5

From the feet up

Question 6

The number on the housfield scale in the middle gray is called what

Answer 6

Window level

Question 7

The range of the gray scale mapped onto the housfield scale is called what

Answer 7

Window width

Question 8

CT numbers below the window are what

Answer 8

Black

Question 9

CT numbers abve the window are what

Answer 9

White

Question 10

The wide window width is good for what

The narrow window is good for what

Answer 10

Wide is good for imaging bone

Narrow is better for soft tissue

Question 11

What is T1 and T2 settings

Answer 11

T1 = longitudinal relaxation time (measure of the time taken for spinning protons to realign with the external magnetic field) [fluid is dark]

T2 = transverse relaxation time (measure of the time taken for spinning protons to lose phase coherence among the nuclei spinning perpendicular to the main field) [fluid is light]