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Flashcards in Principles of Imaging Deck (11)
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1
Q

Outline the production of a radiograph.

A

Electrons are produced by a heating filament. These are then fired at a tungsten block. This excited the tungsten atoms leading to the emission of X-rays. These penetrate tissue and get absorbed to different degrees, producing the desired image.

2
Q

Attenuation

A

Stopping X-ray photons

3
Q

Complete exposure

A

No attenuation, black

4
Q

Unexposed

A

Full attenuation, white

5
Q

Outline the five basic radiographic opacities.

A

Black - air, Dark grey - fat, Mid-grey - soft tissue/ fluid, Light grey - mineral (bone), White - metallic

6
Q

Apparent opacity of materials on radiographs depends upon..

A

Atomic number, physical density, thickness

7
Q

Collimation

A

A scatter plate allows viewing of all four edges of the radiograph

8
Q

Outline the mnemonic approach to assessing radiographs.

A

Alignment, bones, cartilage/joints, devices, everything else (soft tissue)

9
Q

Identify the radiographic signs which should always be checked when assessing a lesion.

A

Number, size (measure), shape, location, opacity

10
Q

What is the mass effect?

A

Masses lead to disruption of normal anatomy

11
Q

Effacement

A

Unable to see the edge of a structure