Middy

Question 1

Field strength is measured in what units?

Answer 1

Tesla

Question 2

What is low field strength?

Answer 2

0.3-0.5 Tesla

Question 3

1.5-3.0 Tesla is what field strength?

Answer 3

High

Question 4

Should extremities be obtained on high or low field magnets?

Answer 4

High

Question 5

What are the types of magnets?

Answer 5

Traditional Bore
Open
Upright open magnet

Question 6

MR Contra-indicators

Answer 6

Brain aneurysm clips
Intra-ocular foreign bodies esp. metal 
Subcutaneous metal or shrapnel
Pacemakers and some heart valves 
Neurotransmitters 
Cochlear implants
Tattoos **some inks have lead
Early pregnancy?

Question 7

TE/Echo time = ?

Answer 7

Time from excitation to detection of signal

Question 8

The time between excitations is known as?

Answer 8

TR/Repetition Time

Question 9

The energy that excites the protons is known as?

Answer 9

RF/Radio Frequency

Question 10

High bright signal = ?

Answer 10

White

Question 11

low signal = ?

Answer 11

dark grey

Question 12

Hypo intense = ?

Answer 12

darker

Question 13

Iso intense = ?

Answer 13

Same

Question 14

Name the different types of MR Sequences

Answer 14

T1
T2
PD
Fat Suppressed - Stir

Question 15

Fat - white
Water - black
Good anatomical detail

T2 or T1?

Answer 15

T1

Question 16

What sequences gives physiologic information especially edema?

Answer 16

T2

Question 17

What sequence is good for cartilage evaluation?

Answer 17

PD - Proton Density

*Fat = light gray
Water = med gray

Question 18

What sequence is good for bone marrow edema, synovial fluid, tendons, ligaments and cartilage evaluation

Answer 18

Fat Suppressed Proton Density Fast Spin Echo
(FS PD FSE)

STIR - Short T1 Inversion Recovery
**takse longer than FS PD FSE

Question 19

Describe a disc Protrusion

Answer 19

Present if the width of the base is wider than the length of the posterior extension

Question 20

Describe an Extrusion

Answer 20

Present if the width of the base is narrower than the length of the posterior extension

Question 21

How many signs of disc herniation do you need to be consistent to the same nerve level?

Answer 21

3 of 5

Question 22

What are the signs of disc herniations?

Answer 22

Primarily leg pain
Leg pain confined to a dermatome 
Neural Stretch Tests recreate pain 
At least 2 of 4 Neuro findings consistent with dermatome: muscle weakness, decreased reflex, abnormal pin wheel, atrophy
MR or CT correlating to dermatome

Question 23

What imaging techniques can show you the vacuum phenomenon?

Answer 23

Xray

CT

Question 24

Loss of disc height can be seen on what imaging techniques?

Answer 24

Xray
MR
CT

Question 25

Describe Modic Type 1

Answer 25

Decreased T1 Increased T2 Sign of acute degeneration Invariably associated with PAINFUL DISCS