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Csb093 Planning > Week 3 Head And Neck Planning > Flashcards

Week 3 Head And Neck Planning Flashcards

1
Q

Brainstem

A

Max 54Gy
Neuropathy or necrosis

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2
Q

Optic chiasm/nerve

A

Max <55Gy
Optic neuropathy

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3
Q

Cochlea

A

Mean 45Gy
Sensory neural hearing loss

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4
Q

Parotid

A

Mean 25Gy
Long term salivary function loss

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5
Q

Pharyngeal constrictors

A

Mean 50Gy
Symptomatic dysphasia and aspiration

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6
Q

Larynx

A

Mean 50Gy
Aspiration

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7
Q

Mandible

A

Radionecrosis

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8
Q

Brain

A

Max <60Gy
Symptomatic necrosis

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9
Q

Heart

A

Mean <26Gy
Pericarditis

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10
Q

Lung

A

V20<30%
Symptomatic pneumonitis

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11
Q

Oesophagus Tolerance

A

Mean <34
Grade 3 oesophagitis

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12
Q

Spinal cord tolerance

A

Max 50 Gy
Myelopathy

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13
Q

IMRT beam angles for head and neck

A

G180, G140, G100, G60, G20, G340, G300, G260, G220
Non-opposing angles - 9 beams

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14
Q

Collimator angles for beams in Head and neck IMRT

A

Coll is at 0 for all beams except G180, G100 and G260
G180: Coll rotated to 270 so MLC can shield spinal cord
G100 and G260: collimator rotated to miss dose to shoulders, inf jaw can also be adjusted

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15
Q

IMRT DMPO Parameters and their meanings

A

Maximum number of segments - 90
Minimum segment area - 4
Minimum segment MUs - 5
Minimum number of leaf pairs - 2
Minimum leaf and separation - 2cm

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16
Q

VMAT smartarc parameters

A

Untick split if neccessary
Constraint leaf motion
Compute final dose
Max iterations
Convolution dose iteration

17
Q

Why do we untick split if neccessary in VMAT

A

Keeps continuous beam delivery without any interruptions caused by beam splitting

Splitting beams increase treatment delivery, by unsticking we manually optimise beam configurations and minimise beam on time

18
Q

A values

A

A<1, for targets, reduces cold spots
A = 1 for parallel structures, considers cold and hot dose equally
A >1 for serial structures, reduces hot spots

Csb093 Planning (7 decks)

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