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Radiology (Spring 2017) > Introduction > Flashcards

Flashcards in Introduction Deck (16)
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1
Q

Which 3 radiation-based imaging modalities are x-radiation based?

A
  1. Radiography
  2. Fluoroscopy
  3. Computed tomography
2
Q

Which radiation-based imaging modality is gamma-radiation based?

A

Scintigraphy

3
Q

What is another term for two radiographs imaged 90 degrees apart?

A

Orthogonal

4
Q

Which legs are denoted by the letter “L”?

A

Front legs

5
Q

What letter are the hind legs denoted by?

A

“H”

6
Q

Scintigraphy involves an intravenous injection of what substance?

A

99mTc

7
Q

What are the 2 types of non-ionizing radiation based imaging modalities?

A
  1. Ultrasound

2. Magnetic resonance

8
Q

Which absorbs more of the x-ray beam, thinner or thicker tissues?

A

Thicker tissues

9
Q

What is a positive summation effect?

A

Relative increase in opacity

10
Q

What is a negative summation effect?

A

Relative decrease in opacity

11
Q

Osteoclasts develop from the fusion of what?

A

Circulating monocytes

12
Q

Osteoblasts develop from what type of cells?

A

Mesenchymal stem cells

13
Q

Increased stress on a bone leads to addition or reduction of bone?

A

Addition of bone

14
Q

Decreased stress on a bone leads to addition or reduction of bone?

A

Reduction of bone

15
Q

There is a lag time between osteoid matrix formation and matrix mineralization visible on an x-ray. How long is this lag time in the immature skeleton?

A

7-10 days

16
Q

There is a lag time between osteoid matrix formation and matrix mineralization visible on an x-ray. How long is this lag time in the mature skeleton?

A

10-14 days