Introduction

Question 1

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

Answer 1

1. Radiography
2. Fluoroscopy
3. Computed tomography

Question 2

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

Answer 2

Scintigraphy

Question 3

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

Answer 3

Orthogonal

Question 4

Which legs are denoted by the letter “L”?

Answer 4

Front legs

Question 5

What letter are the hind legs denoted by?

Answer 5

“H”

Question 6

Scintigraphy involves an intravenous injection of what substance?

Answer 6

99mTc

Question 7

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

Answer 7

1. Ultrasound

2. Magnetic resonance

Question 8

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

Answer 8

Thicker tissues

Question 9

What is a positive summation effect?

Answer 9

Relative increase in opacity

Question 10

What is a negative summation effect?

Answer 10

Relative decrease in opacity

Question 11

Osteoclasts develop from the fusion of what?

Answer 11

Circulating monocytes

Question 12

Osteoblasts develop from what type of cells?

Answer 12

Mesenchymal stem cells

Question 13

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

Answer 13

Addition of bone

Question 14

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

Answer 14

Reduction of bone

Question 15

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?

Answer 15

7-10 days

Question 16

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?

Answer 16

10-14 days