Radiation safety

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What are the layers of the xray detector?
bottom layer, middle layer and top layer
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Describe the bottom layer of the xray detector
mother board and pixel squares which contain light detecting diodes (1-1 matrix allows more accurate diagnoses)
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Describe the middle layer of an xray detector
phosphor crystal layers in a portrait alignment
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Describe the top layer of an xray detector
protective hard case which holds everything together and ensures safety for detector components
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How is the image received by the xray detector?
photons hit the board, crystals react by starting to glow and light is directed downwards which is picked up by light detecting diodes which form an EC
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What is a grey level?
what the electrical current is converted into to form an image with contrast
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What is the purpose of a grid in a Bucky?
to only allow straight/ slightly angulated photons in and block out other photons
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What do filters within the xray do?
they get rid of low energy photons to ensure a good quality image
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How are cells damaged by X-rays?
energy dumping which causes instability within the cells due to free radicals
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Are cells better off being killed or damaged?
killed
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What is a stochastic effect of radiation?
effects which occur by chance and occur without a threshold level of dose
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What is the relationship between dose and a stochastic effect?
directly proportional and effects are dependent on what type of radiation
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What are main effects from stochastic effects?
cancer and genetic effects
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What is a deterministic effect?
cause and effect relationship between ionising radiation and side effects
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What is the relationship between dose and deterministic effect?
directly impacted by dose level so they can be monitored and avoided
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What are the main effects with deterministic effects?
cancers, skin burns
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What is NICE?
its used as a guideline in radiography
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What is IMER17/18?
ionising radiation redulations, approval is required where patients are exposed to ion. rad. and when any research is carried out
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What is IRR17/18
ionising radiation regulations, control of radiation exposure to people at work by keeping rad as low as possible
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What is ICRP?
international
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Other cards in this set

Card 2

Front

Describe the bottom layer of the xray detector

Back

mother board and pixel squares which contain light detecting diodes (1-1 matrix allows more accurate diagnoses)

Card 3

Front

Describe the middle layer of an xray detector

Back

Preview of the front of card 3

Card 4

Front

Describe the top layer of an xray detector

Back

Preview of the front of card 4

Card 5

Front

How is the image received by the xray detector?

Back

Preview of the front of card 5
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