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Therapy Prin & Procedure > Ch 7: Tteatment Delivery Equipment > Flashcards

Ch 7: Tteatment Delivery Equipment Flashcards

1
Q

What is the half life of cobalt-60

A

5.26 years

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2
Q

What is the source to axis distance for a Co-60 treatment unit?

A

80cm

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3
Q

Co-60 images have _______(more/less/same) penumbra than images taken on a Linac.

A

More

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4
Q

Photon treatment with a Linac exhibit ______(more/less/same) skin sparring than more traditional units

A

More

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5
Q

Most treatment couches allow for ___ degrees of freedom

A

4

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6
Q

This/these device provide the microwave power to Linac

A

Klystron and magnetron

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7
Q

This structure directs the microwave power toward the accelerator structure

A

Circulator

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8
Q

The length of this structure depends on the energy capability of the machine

A

Accelerator structure

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9
Q

______ is used in photon mode/tx while _____ is used in electron mode/tx

A

Flattening filter; scattering foil

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10
Q

This device monitors the flatness and symmetry of the beam

A

Ion chamber

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11
Q

Linacs, Van de Graaf generators, Betatron, Cyclotron and cobalt-60 are examples of…

A

High energy units (mega voltages)

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12
Q

T/F

Linear accelerators give better dose distribution, faster dose rates, and is more manageable radiation protection.

A

True

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13
Q

Treatment time increased as source decay. Which high beam unit is this?

A

Cobalt-60

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14
Q

The fuzzy edge of the radiation beam is known as?

A

Penumbra

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15
Q

T/F

Increased in penumbra is found with a Linac

A

False. More penumbra with cobalt 60

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16
Q

We call our machines linear accelerators because we accelerate electrons near the rate of ___________.

A

Speed of light in a straight line

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17
Q

SAD is also Called the _____technique

A

Isocentric

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18
Q

What is skin sparing

A

The deeper the radiation penetrate the body, the less reaction you’re going to have at the skin

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19
Q

Why are linac more preferable over cobalt 60?

A

Because it’s more accurate and cosmetically favorable due to the increase in skin sparring

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20
Q

The drive stand houses what 4 major components?

A

Klystron/magnetron
Waveguide
Circulator
Cooling system

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21
Q

Major components of the Linac

A

Drive stand
Gantry
Treatment couch

22
Q

Varian: drive stand is ______ room

A

Inside

23
Q

Elekta: driver stand is _______ room, behind _______

A

Outside; walls

24
Q

Semins: drive stand is _______ room

A

Inside

25
Q

What are CCTV and their purpose?

A

CCTV: closed circuit TV are cameras placed inside the treatment room to monitor the patient indirectly

26
Q

Lead walls or ______ ______ is used to stop radiation

A

Thick concrete

27
Q

The couch has 6 degrees of freedom. What are they

A 
Lateral
Longitudinal
Rotation 
Pitch
Roll
Vertical
28
Q

What are the components of the gantry (3)

A

Electron gun
Accelerator guide
Accelerator structure

29
Q

_______ provide the microwave source

A

Klystron/magnetron

30
Q

_________ prevent black flow of microwaves by punching the microwaves forward

A

Circulator

31
Q

_________ allows the gantry and components to operate at a constant temp. Linacs uses cold water

A

Cooling system

32
Q

_____ produces the electron and injects the electron into the accelerator structure

A

Electron gun

33
Q

_______ transport microwave power to the accelerator structure

A

Accelerator guid

34
Q

The _________ amplifies momentum of the electron stream, speed the electron to the speed of light and can range from 30cm to 1m

A

Accelerator structure

35
Q

T/F

The length of the accelerator structure is dependent on the bea energy

A

True

36
Q

To deactivate the beam, you could

A

Turn the key
Open the door
Push “beam interrupt”

37
Q

What’s the max field size for modern linac

A

40 x 40

38
Q

The backup or secondary ion chamber is set to terminate the beam with ______ number of MU than primary chamber

A

A higher due to beam pulsating

39
Q

Photon treatments with linac exhibit _____ skin sharing than tradition

A

More

40
Q

The length of this structure depends on the energy capability of the machine

A

Accelerator structure/guide

41
Q

This structure directs the microwave power toward the accelerator structure

A

Waveguide

42
Q

What’s the depth of Dmax for a 10 MV beam ?

A

2.5

43
Q

This device monitors the flatness and symmetry of beam

A

Ion chamber

44
Q

What’s the Dmax for a 4MV beam

A

1.0cm

45
Q

What’s the first thing you should do if the beam fails to terminate

A

Push the beam interrupt (beam off) button

46
Q

Most linear accelerators have horizontally mouthed accelerators guides

A

True

47
Q

Wedges

A

Changes the isodose distribution

48
Q

As energy increases, depth of electron equilibrium (Dmax)

A

Increases

49
Q

Output of a combalt 60 is measured in terms of

A

Minutes and seconds

50
Q

A no harm incident is one in which…

A

An event reached the patient but the patient was not injured

Therapy Prin & Procedure (17 decks)

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