CHAPTER 8: Overview of Diagnostic Imaging of the Head and Neck

Question 1

True or False
AP and lateral views of the neck exposed for soft tissue of the neck, and are often used in the urgent diagnoses of the upper airway infection or FB aspiration

Answer 1

True

Question 2

The ratio of the speed at which the table moves to the time it takes for a complete rotation of the CT tube

Answer 2

Pitch

Question 3

Degree of attenuation of the x-ray photons for each voxel (smallest imaging unit)

Answer 3

Hounsfield units (-1000 HU to 1000 HU)

Question 4

HU of water

Answer 4

0 HU

Question 5

HU of fat

Answer 5

-80 to 100 HU

Question 6

HU of calcium and bone

Answer 6

100 to 400 HU

Question 7

HU of fluids

Answer 7

0 to 30 HU

Question 8

CT uses complex mathematical reconstruction algorithms

Answer 8

Filters

Question 9

Refers to the range of attenuation values in HU that make up the gray scale for a given image

Answer 9

Window width

Question 10

Refers to the center HU value for that given window width

Answer 10

Window level

Question 11

Tru or False

Any density greater than 80 HU will displayed as white

Answer 11

True

Question 12

True or False

Any density less than zero will be displayed as black

Answer 12

True