Digital Radiography

Question 1

Cateragories of Digital Radiography

Answer 1

• Computed radiography (CR)
• Direct Digital Radiography (DDR)
• Indirect Digital Radiography (IDR)

Question 2

Does CR require a cassette

Answer 2

Cassette based digital radiography

Question 3

What layers does the imaging plate consist of?

Answer 3

Protective layer
Phosphor layer
Reflective layer
Conductive layer
Colour layer
Support layer
Backing layer

Question 4

How does CR work?

Answer 4

X-ray photons cause excitation of photons in the phosphor layer, trapping electrons, creating an image.

Question 5

What is a cassette?

Answer 5

Cassette protects the imaging plate from light and handling.

Question 6

Does DDR and IDR require a cassette?

Answer 6

Does not require a cassette.

Question 7

What is DDR?

Answer 7

One-phase process

Converts xray energy into an electrical charge

Made up of a photoconducter & thin film transistor

Question 8

What is IDR?

Answer 8

A two-phase process

xray energy is converted into light and the into an electrical charge

Question 9

What is the protective layer?

Answer 9

Thin protection layer, protects the emulsion layers as theyre more fragile

Question 10

Phosphor Layer

Answer 10

Absorb x-ray photons

They play a crucial role in dental procedures due to their flexibility

Question 11

Reflective Layer

Answer 11

Reflects the light emitted by the phosphor layer back towards x-ray film

Question 12

Conductive layer

Answer 12

Absorbs and reduces static electricity

Question 13

Colour layer

Answer 13

Absorbs the stimulating light but reflects emitted light

Question 14

Support layer

Answer 14

Gives the plate strength and is the base for coating other layers

Question 15

Backing layer

Answer 15

Protects cassettes back