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Treatment Planning > Icru > Flashcards

Icru Flashcards

1
Q

Treatment planning process?

A 
Patient positioning
Imaging
Anatomy definition
Beams
Dose
Plan evaluation 
Implementation
Review
Treat
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2
Q

What types of treatment planning are there?

A

1-4 dimensions of planning

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3
Q

What is 2D planning?

A

Just use one slice of CT scan

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4
Q

What is 3D planning?

A

Using multiple slices of CT

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5
Q

What is 4D planning?

A

Same as 3D plan but takes into account movement

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6
Q

What is parallel opposed pair?

A

Two beams which overlap at the centre giving a higher dose to the tumour

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7
Q

Is the attenuation compensated by the opposing beam?

A

Yes if one beam has attenuated to 30% the other will have an intensity of 70%

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8
Q

Advantages of POP?

A

Simple reproducible

Homogenous dose to tumour

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9
Q

What is SSD?

A

Set up lasers to the surface of patient

Beam is wider for SSD disadvantage machine can’t be moved outside of the room
You have to set up every field
100cm on skin

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10
Q

What is SAD?

A

Set up to a point in the patient isocentric

100cm at isocentre within patient

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11
Q

Are electron beams fixed

A

Yes they have a fixed SSD

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12
Q

What does homogeneity and dose uniformity mean?

A

Means uniformity deliver a homogenous dose to tumour

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13
Q

What are the factors of homogeneities?

A

Patient size
Tumour position
Beam energy
Different tissue densities

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14
Q

Does dose uniformity change at deeper depths?

A

Yes it does

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15
Q

What is beam weighting?

A

Each field contributes different amount of the dose

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16
Q

What are the benefits of beam weighting?

A

Improve dose uniformity
The PTV may not be centrally located
Different tissue densities in the volume
Reduce dose to organs at risk etc

17
Q

Aim of treatment planning?

A

Maximum dose to tumour while sparing normal tissue

By changing field size, number of fields, beam angles, beam weights and beam modifiers

18
Q

What is the GTV?

A

Gross tumour

19
Q

What is the CTV?

A

For microscopic disease

20
Q

What is the PTV?

A

Is the CTV with a margin for variations in size, shape and position

21
Q

What is the treated volume?

A

Volume that receives a dose that is considered important for local cure or palliation close to PTV

22
Q

What is the purpose of ICRU 50/62

A

For prescribing therapy
Recording therapy
Reporting therapy

23
Q

What are internal margins?

A

Inter fraction variations

Intra fraction variations

24
Q

What are set up margins?

A

Systematic variations

Random variations

25
Q

What is a hotspot?

A

Volume outside the PTV which receives a dose larger than 100% must be greater than 1.5cm

Treatment Planning (4 decks)

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