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Special Imaging > Middy > Flashcards

Middy Flashcards

1
Q

Field strength is measured in what units?

A

Tesla

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2
Q

What is low field strength?

A

0.3-0.5 Tesla

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3
Q

1.5-3.0 Tesla is what field strength?

A

High

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4
Q

Should extremities be obtained on high or low field magnets?

A

High

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5
Q

What are the types of magnets?

A

Traditional Bore
Open
Upright open magnet

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6
Q

MR Contra-indicators

A 
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?
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7
Q

TE/Echo time = ?

A

Time from excitation to detection of signal

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8
Q

The time between excitations is known as?

A

TR/Repetition Time

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9
Q

The energy that excites the protons is known as?

A

RF/Radio Frequency

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10
Q

High bright signal = ?

A

White

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11
Q

low signal = ?

A

dark grey

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12
Q

Hypo intense = ?

A

darker

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13
Q

Iso intense = ?

A

Same

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14
Q

Name the different types of MR Sequences

A

T1
T2
PD
Fat Suppressed - Stir

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15
Q

Fat - white
Water - black
Good anatomical detail

T2 or T1?

A

T1

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16
Q

What sequences gives physiologic information especially edema?

A

T2

17
Q

What sequence is good for cartilage evaluation?

A

PD - Proton Density

*Fat = light gray
Water = med gray
18
Q

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

A

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

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

19
Q

Describe a disc Protrusion

A

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

20
Q

Describe an Extrusion

A

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

21
Q

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

A

3 of 5

22
Q

What are the signs of disc herniations?

A 
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
23
Q

What imaging techniques can show you the vacuum phenomenon?

A

Xray

CT

24
Q

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

A

Xray
MR
CT

25
Q

Describe Modic Type 1

A

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

Special Imaging (1 decks)

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