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Flashcards in Radiology Deck (16):
1

How do you differentiate a fracture from a growth plate on x-ray?

Fracture = jagged line

Growth plate = straight line

2

What 3 factors determine absorption of an x-ray beam?

Thickness of tissue. Density of tissue. Atomic number of a tissue to the 4th power.

3

What does doppler ultrasound allow you to image?

Blood flow

4

Is the wavelength of x-rays shorter or longer than visible light?

Shorter

5

What percentage of inpatients have some sort of imaging at RMH?

95%

6

What is the unit of measurement of the absorption of a voxel?

Hounsfield unit

7

What do ultrasound waves reflect off?

Tissue interfaces

8

Which has better spatial resolution: CT or x-ray?

X-ray

9

What are the 4 essential things to have the Pt do when taking a CXR?

Full inspiration, erect, PA, scapula out of the way

10

When windowing a CT, what determines the contrast of the image?

Window width

11

What are 3 advantages of x-radiography over CT?

Cheaper, less ionising radiation and better spatial resolution

12

What is the most common radioisotope used in gamma ray imaging?

Technetium

13

What is the advantage of gamma ray imaging?

Functional imaging

14

How much stronger is a 1.5T MRI machine than the Earth's magnetic field?

30,000 times greater

15

How is iodine intravascular contrast medium excreted?

Kidneys

16

What type of wave does ultrasound use?

Very high frequency sound waves