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Radiography > Image Receptors > Flashcards

Image Receptors Flashcards

1
Q

What two types of digital system are available?

A

Solid state censor

Photo stimulable phosphor

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2
Q

When is direct action film used?

A

Intra oral radiography

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3
Q

When is indirect action film used?

A

Extra oral radiography

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4
Q

In direct film what do the xrays act on?

A

Silver halide crystals in the film emulsion

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5
Q

In indirect film, how is image produced?

A

Light from intensifying screen acts on silver halide crystals in film emulsion

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6
Q

How do photo stimulable phosphor plates work?

A 
Phosphor layer absorbs and stores xray energy in electrons of phosphor crystals 
Plate inserted into scanner
Scanned by red laser 
Blue light emitted
Light detected by photomultiplier tube
Light converted to electrical signal 
Relayed to computer
Converted to digital image
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7
Q

How is the digital image erased?

A

Bright light releases trapped energy

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8
Q

What does CCD stand for?

A

Charged coupling device

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9
Q

What is the CCD made up of?

A

Back cover incorporating cable
Silicon wafer
Scintillator layer
Front cover

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10
Q

What is the purpose of the silicon wafer?

A

Converts light to electrical signal

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11
Q

What does the scintillator layer do?

A

Converts X-ray energy to light

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12
Q

How do CCD work?

A

Xray hits scintillator layer
Light given off
Light hits photosensitive cells in silicone layer
Pixels made up
Electron released and form charge which is converted to voltage
Computer converts electrical signal to an image

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13
Q

What does CMOS stand for?

A

Complementary metal oxide semiconductor

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14
Q

How does CMOS differ from CCD?

A

Photo cells electrically isolated therefore voltage comes from each individual cell.

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15
Q

What gives better quality image?

A

CCD

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16
Q

What are advantages of digital imaging?

A 
No chemicals 
Easy archiving
Easy image transfer
Image manipulation 
Dose reduction
17
Q

How should images be stored

A

Dental practice
Local server
Some form of back up

18
Q

What does PACS stand for?

A

Picture archive and communication system

19
Q

What receptor size should be used for PA in adults?

A

1 or 2

20
Q

What receptor size should be used for adult bite wings?

A

2

21
Q

What receptor size should be used for children PA?

A

1

22
Q

What two types of film are available?

A

Direct action

Indirect action film

Radiography (18 decks)

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