CT and MRI

Question 1

Which has the best detail: radiography, CT or MRI?

Answer 1

Radiography

Question 2

Which has the best contrast resolution: radiography, CT or MRI?

Answer 2

MRI

Question 3

A function of contrast resolution and detail is known as what?

Answer 3

Conspicuity

Question 4

The ability of an imaging system to differentiate between two adjacent objects is known as what?

Answer 4

Spatial resolution

Question 5

Are the differences in spatial resolution between radiography, CT and MRI small or large?

Answer 5

Small

Question 6

Images in the form of slices are known as what?

Answer 6

Tomography

Question 7

With CT, what happens to the x-ray beam in relation to the patient?

Answer 7

The x-ray beam rotates around the patient.

Question 8

What type of CT mode has a continuous table and x-ray tube movement allowing faster scanning?

Answer 8

Helical

Question 9

With CT, is one or more slices per tube revolution acquired?

Answer 9

More than one.

Question 10

Building images in other places from transverse data is known as what?

Answer 10

2D Reformatting

Question 11

A substance used to enhance the contrast of structures or fluids withing the body in medical imaging is known as what?

Answer 11

Contrast medium

Question 12

What is commonly used to enhance the visibility of blood vessels, vascular leaks and the gastrointestinal tract?

Answer 12

Contrast medium

Question 13

What is put in IV contrast medium?

Answer 13

Iodine

Question 14

Contrast medium can help to show what in relation to vasculature?

Answer 14

Increased vascularity/vascular permeability

Question 15

What are 5 things CT can be used for?

Answer 15

• Nasal disease
• Thoracic masses; resectable
• Fragmented medial coronoid process
• Radiation therapy planning
• Portal vein anomalies

Question 16

T/F: Contrast resolution is much less in an MRI compared to CT.

Answer 16

False - It is much greater.

Question 17

Do MRIs use ionizing radiation?

Answer 17

No

Question 18

Image appearance in an MRI is dependent on what 2 things?

Answer 18

• Water

- Fat

Question 19

What does an MRI use to create an image?

Answer 19

Magnetism

Question 20

Are there any radiation hazards with MRIs?

Answer 20

No

Question 21

What is being imaged in an MRI?

Answer 21

Hydrogen protons (water)

Question 22

Most lesions have an increased amount of what which can be detected by MRI?

Answer 22

Water

Question 23

What does the main magnet of an MRI do to the protons?

Answer 23

Causes protons to align with a field.

Question 24

What knocks the protons out of alignment into the X-Y plane with an MRI?

Answer 24

Radio waves

Question 25

The signal strength of an MRI is converted to what?
High signal looks what?
Low signal looks what?

Answer 25

• Grey scale in an image.
• White
• Black

Question 26

What is seen in a T1 MRI?

Answer 26

Fat

Question 27

What is seen in a T2 MRI?

Answer 27

Free water, tissue water, fat

Question 28

What is seen in a FLAIR MRI?

Answer 28

Tissue water and Fat

Question 29

What is seen in a STIR MRI?

Answer 29

Free water and tissue water

Question 30

What can’t be seen in a STIR MRI?

Answer 30

Fat

Question 31

What color is bone in an MRI?

Answer 31

Black

Question 32

What color is bone in a CT?

Answer 32

White

Question 33

What does FLAIR stand for?

Answer 33

FLuid
Attenuated
Inversion
Recovery

Question 34

FLAIR nulls the signal from what?

What is an example?

Answer 34

• Free fluid

- CSF

Question 35

What does STIR stand for?

Answer 35

Short
Tau
Inversion
Recovery

Question 36

What is a contrast medium used for MRI that speeds up proton relaxation?

Answer 36

Gadolinium

Question 37

Gadolinium is used only in which MRI sequence?

Answer 37

T1

Question 38

What is the main use of MRI in veterinary medicine?

Answer 38

Neuroimaging