Lecture 4: Imaging and Clinical Applications

Question 1

What should you verify regarding imaging?

Answer 1

• Name
• Date/time
• Study type

Question 2

What are different radiological studies?

Answer 2

• Plain x-rays
• CT scans
• MRI
• Ultrasound

Question 3

What is ideal modality for sacral imaging?

Answer 3

CT (MRI for neurologic)

Question 4

What is the least dense finding on an x-ray and how does it appear?

Answer 4

Air - will be black

Question 5

What is the most dense finding on an x-ray and how does it appear?

Answer 5

Metal - will be very bright

Question 6

Rank in order of density (least to most): 
bone
fat
air
metal
soft tissue

Answer 6

Least dense: air
fat
soft tissue
bone
Most dense: metal

Question 7

Which film will look magnified, PA or AP film?

Answer 7

AP

Question 8

Which film is more commonly prefered, PA or AP film?

Answer 8

PA

Question 9

What can be seen in an abdominal x-ray?

Answer 9

• Fluid and air in organs

- Kidney stones (dense)

Question 10

True or false: Cortex of bone is denser than medulla of bone.

Answer 10

True

Question 11

In a CT scan, what is absorption value of water?

Answer 11

0 HU

Question 12

In a CT scan, what is absorption value of fluid seen in ascites?

Answer 12

0-20 HU

Question 13

In a CT scan, what is absorption value of blood?

Answer 13

40-60 HU

Question 14

In a CT scan, what is absorption value of bone and metal?

Answer 14

800+ HU

Question 15

In a CT scan, what is absorption value of fat and air?

Answer 15

-70 to -800 HU

Question 16

Almost all CT scans acquire information in what plain?

Answer 16

Axial

Question 17

In a T1 image, what color is fluid?

Answer 17

Black

Question 18

In a T2 image, what color is fluid?

Answer 18

White