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Radio 2 > Advanced Imaging > Flashcards

Advanced Imaging Flashcards

1
Q

Shape of CT beam?

A

fan

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2
Q

Houndsfield numbers vary from what to what?

A

-1000 air to 1000 bone

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3
Q

CT advantages (3)

A

uniform mag 3 different views additional views can be computed

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4
Q

CT disadvantages (4)

A

Limited avail. expensive HIGH dose radiologist required

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5
Q

4 uses of CT

A
  1. Trauma 2. neoplasm 3. Chronic infection/inflammation 4. implant treatment planning
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6
Q

Cone-beam CT dose compared to normal?

A

lower

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7
Q

3 applications of CBCT

A
  1. eval of pathology 2. implant planning 3. 3D reconstruction
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8
Q

MRI uses what to form image?

A

magnetic field of hydrogen protons generated from burst of RF signal and subsequent release of energy when electrons un-align

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9
Q

T1 weighted vs T2

A

T1 - fat bright T2 - water bright

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10
Q

MRI advantages (4) disadvantages (4)

A

Advantages Uniform magnification Lateral, coronal, and axial views available No ioninizing radiation Asses soft tissue not avail by CT like TMJ Disadvantages Limited availability Very Expensive Some patients can not tolerate claustrophobic conditions Radiologist required for acquisition and interpretation

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11
Q

Intensifying screen advantage?

A

lower pt dose

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12
Q

Standard screen color/material?

A

calcium tungstate - blue

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13
Q

Grids used to…

A

remove scatter radiation and improve quality

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14
Q

Grids bad b/c

A

increase pt exposure to overcome absorbing materials

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15
Q

Lateral cephalogram applications

A

nasopharyngeal soft tissues paranasal sinuses

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16
Q

PA Ceph applications

A

symmetry frontal & ethmoid sinuses Nasal fossa, orbit

17
Q

Reverse Towne applications

A

mandibular condyle fractures

18
Q

Caldwell applications

A

Orbit Frontal & ethmoid sinuses Superior orbital fissure Sella turcica

19
Q

Lateral Oblique mandibular projection for…

A

3rd molars and ramus

20
Q

Waters view for…

A

max sinuses nasal cavity orbit

21
Q

Submento vertex projection for…

A

base of skull position and orientation of condyles sphenoid sinus curvaturemandibile zygomatic fracture

22
Q

What projection?

A

Lateral Cephalometric

23
Q

What projection?

A

PA Ceph

24
Q

What Projection?

A

Reverse Towne’s

25
Q

What Projection?

A

Caldwell

26
Q

What projection?

A

Lateral Oblique mandibular

27
Q

What Projection?

A

Waters

28
Q

What projection?

A

Submento-vertex

29
Q

Label the projections

A

Radio 2 (5 decks)

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