Intro - CT & MRI

Question 1

Need to see cortical bone well

Answer 1

CT

Question 2

Need to see bone marrow or soft tissues well

Answer 2

MRI

Question 3

T1 MRI focus

Answer 3

Fat

Question 4

T1 which structure is whiter

Answer 4

Fat

Question 5

T1 Pros

Answer 5

Good anatomic detail
Detection in loss of epidural fat
Marrow
Hemorrhage

Question 6

Cons T1

Answer 6

No edema eval

Question 7

T2 MRI focus

Answer 7

Water focused

Question 8

T2 which structures are whiter

Answer 8

Water
Synovial fluid
Edema
Csf

Question 9

T2 pros

Answer 9

Detecting edema
Detecting malignancies and infections

Question 10

T2 cons

Answer 10

Longer imaging time
Motion artifact

Question 11

PD

Answer 11

Proton density

Question 12

PD evaluates what in detail

Answer 12

Fibrocartilage
Meniscus
Tfcc

Question 13

Cons PD

Answer 13

Poor contrast
Poor edema eval

Question 14

GRE

Answer 14

Gradient echo

Question 15

GRE pros

Answer 15

Less scan time w T2
Good for small ligaments
Wrist and ankle
Good for stricular cartilage
Loose bodies

Question 16

GRE Cons

Answer 16

Reduced contrast for muscle and fat
Susceptibility artifact
Loss of signal at tissue interfaces
Edema in marrow fat

Question 17

STIR

Answer 17

Short tau inversion recovery

Question 18

Stir pros

Answer 18

T2 weighted
Sensitive to fluid
Sensitive to marrow pathology

Question 19

Stir cons

Answer 19

Poor resolution
Cannot be used with contrast

Question 20

Fat sat pros

Answer 20

Similar to stir
Can be used w contrast

Question 21

Fat sat cons

Answer 21

Higher magnet field strength
Incomplete saturation
Issues with curved structures

Question 22

MRI description of signal

Answer 22

Intensity

Question 23

MRI “darker”

Answer 23

Hypointense

Question 24

MRI “brighter”

Answer 24

Hyperintense

Question 25

MRI isointense

Answer 25

Same

Question 26

CT terminology with signal

Answer 26

Attenuation

Question 27

MRI high signal

Answer 27

White

Question 28

MRI low signal

Answer 28

Black

Question 29

CT high attenuation

Answer 29

White

Question 30

CT low attenuation

Answer 30

Black

Question 31

CT “brighter”

Answer 31

Hyperattenuating

Question 33

CT “darker”

Answer 33

Hypoattenuating

Question 34

CT contains how many shades of grey

Answer 34

4000

Question 35

Windowing

Answer 35

Allows for increased contrast between soft tissues

Question 36

Levelling

Answer 36

Changes the center point of the grey scale

Question 37

DICOM

Answer 37

Digital imaging and communication in medicine

Question 38

PACS

Answer 38

Picture archiving and communication system

Question 39

Imaging protocol

Answer 39

1. Radiograph will increase information about the patient complaint 2. The radiographic will result in a alteration of prognosis or alter patient management 3. Benefit outweighs the hazards 4. Will be more useful than alternative less invasive diagnostic procedures