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Treatment Planning > SSD And SAD > Flashcards

SSD And SAD Flashcards

1
Q

What is SAD?

A

Field size is defined at 100cm within the patient

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2
Q

What is SSD?

A

Field size at 100cm on the patient skin

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3
Q

What is parallel opposed pair?

A

Pair of fields opposite sides

Simple and reproducible
Homogenous dose
SSD or SAD

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4
Q

What is TSET?

A

Total skin electron therapy

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5
Q

For lower energies dose is where?

A

Higher in subcutaneous tissue

As energy increases it becomes more uniform reduced skin sparing effects

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6
Q

What has a more even dose distribution?

A

Higher energies

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7
Q

Larger energies have larger what?

A

Exit dose

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8
Q

If too much dose to OAR can they still be treated?

A

Yes using brachytherapy surgery and chemotherapy

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9
Q

What are sensitive tissue within the brain?

A 
Lens
Eye
Optic nerve
Temporal lobe
Cerebellum
Cochlea
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10
Q

Small volumes can receive larger amounts of dose as opposed to large volumes of tissue receiving smaller dose?

A

Yes

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11
Q

What is a symmetrical field?

A

He same?

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12
Q

What is an asymmetrical field size?

A

Are different

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13
Q

What are radiation therapy fields like?

A

Asymmetrical (MLCS)

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14
Q

When using asymmetrical jaws what can we do?

A

Achieve a zero field edge?

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15
Q

What is a monoisocentric setup?

A

One isocentre on the zero jaw

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16
Q

What is a DRR?

A

Digital reconstructed radiograph

Reconstructed images in planes other than original image generated by a computer system

17
Q

Can recreate DRRs to include what?

A

Tilts and gantry rotation

18
Q

Features of a good plan?

A 
Field sizes
PTV-homogenous 107-95
Maximum doses in PTV
OAR- marked on plan
Dose to OAR minimised
Reference point position meets criteria
Plan achieves treatment aim-radical or palliative
19
Q

Palliative brain fractionation?

A

20Gy in 5 fractions

Treatment Planning (4 decks)

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