CR and DR

Question 1

Two types of DR

Answer 1

• indirect dR
• direct dR

Question 2

Indirect digital radiography

Answer 2

• x- ray photon generates light emission from a phosphor layer
• measured by a CCD or TFT array

Question 3

Direct radiography

Answer 3

• x-ray photon generates charge within photon-conductor
• measured by a TFT array

Question 4

Devices used for production of a digital image

Answer 4

• CR plate
• charge coupled device (CCD)
• TFT arrays

Question 5

What is the outer case of the cr plate made of and why is it useful

Answer 5

• carbon fibre
• cheap and strong
• low atomic number = more radiolucent than aluminium