Other Machines Flashcards by Jennifer Montoya

Q

grenz ray history

A

1st machine

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Q

contact therapy treats what depth

A

superficial

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Q

superficial therapy treats what depth

A

superficial

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Q

orthovoltage energy

A

150-500kVp

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Q

supervoltage energy

A

500-1000kVp

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Q

megavoltage

A

1MV >

- or 10^6 eV or 1 MeV

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Q

van de graff generator kind

A

electrostatic generator

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Q

betatron e- travel

A

within hollow ring

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Q

how microtron works

A

e- accelerated by mag field to microwave cavity

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Q

cyclotron is what kind of accelerator

A

charged PARTICLE accelerator

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Q

superficial vs e- penumbra

A

superficial has sharper penumbra

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Q

prostate tx with p+ advantage

A

only advantage is lower integral whole-body dose

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Q

Co-60 cylinder

A

double encapsulated cylinder filled w/disks or pellets of Co

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Q

Co-60 emits

A

2 photons per disintegration

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Q

grenz ray treats what depth

A

superficial

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Q

grenz ray energy

A

below 20 kVp

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Q

contact therapy energy

A

40-50 kVp

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Q

contact therapy SSD

A

2 cm

Q

superficial therapy energy

A

50-150 kVp

Q

superficial therapy SSD

A

15-20 cm

Q

superficial therapy HVT

A

1-8 mm Al

Q

superficial therapy lesions defined by

A

cone attachment

Q

superficial therapy backscatter amount

A

high

Q

orthovoltage SSD

A

50-70 cm

Q

orthovoltage treats

A

skin surface

Q

orthovoltage backscatter amount

A

high

Q

orthovoltage HVT

A

4 mm Cu

Q

megavoltage SSD

A

100 cm

Q

van de graff generator energy

A

2MV

Q

how van de graff generator works

A

e- carried by belt & dropped through rings

Q

van de graff generator size

A

large

Q

betatron shape

A

donut shaped

Q

how betatron works

A

magnetic field travels in circles via changing magnetic field

Q

betatron produces

A

x-rays & e-

Q

betatron dose rate

A

low

Q

betatron field size

A

limited

Q

microtron uses

A

magnetron/klystron

Q

microtron gantry size

A

small

Q

cyclotron produces

A

p+, n, deutrons

Q

cyclotron path

A

circular path between semi-circular dees

Q

cyclotron dees

A

highly evacuated magnetic structures that prevent particles from striking chamber walls

Q

superficial vs e- skin dose

A

superficial has higher

Q

superficial vs e- shielding

A

superficial has thinner Pb shielding