Radiology Flashcards

1
Q

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

A

Fracture = jagged line

Growth plate = straight line

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2
Q

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

A

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

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3
Q

What does doppler ultrasound allow you to image?

A

Blood flow

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4
Q

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

A

Shorter

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5
Q

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

A

95%

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6
Q

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

A

Hounsfield unit

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7
Q

What do ultrasound waves reflect off?

A

Tissue interfaces

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8
Q

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

A

X-ray

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9
Q

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

A

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

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10
Q

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

A

Window width

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11
Q

What are 3 advantages of x-radiography over CT?

A

Cheaper, less ionising radiation and better spatial resolution

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12
Q

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

A

Technetium

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13
Q

What is the advantage of gamma ray imaging?

A

Functional imaging

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14
Q

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

A

30,000 times greater

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15
Q

How is iodine intravascular contrast medium excreted?

A

Kidneys

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16
Q

What type of wave does ultrasound use?

A

Very high frequency sound waves