Exam 1 Review

Front 1

Total dose that causes complications in 5% on the population with in 5 years

Back 1

TD 5/5

Front 2

Name 4Rs of radiobiology

Back 2

1. Repopulation
2. Redistribution
3. Repair
4. Reoxygenation

Front 3

Distance between the skin surface where the prescribed dose is delivered

Back 3

Depth

Front 4

Intrafield distance aka:

Back 4

Separation

Front 5

Measurement of the patients thickness from the point of beam entry to the point of exit beam

Back 5

Separation

Front 6

Refers to physical dimensions set on the collimators

Back 6

Field size

Front 7

Intersection of the axis of reparation of gantry and the axis of rotation of the collimator

Back 7

Isocenter

Front 8

Benefit of prone position

Back 8

Pulling down of small bowel

Front 9

Refers to energy deposited at a certain point

Back 9

Dose
aka absorbed dose

Front 10

Point where maximum absorbed dose occurs for single field photon beam and depends on energy of beam

Back 10

Dmax / dose maxium

Front 11

Source of microwave power used to accelerate electrons is produced where

Back 11

Klystron

Front 12

Responsible for directing the photon (X-ray beam) or electron beam at. Patients tumor

Back 12

Gantry

Front 13

Responsible for producing electrons and injecting them into accelerator structure

Back 13

Electron gun

Front 14

Used in electron mode to help shape the beam

Back 14

Scattering foil

Front 15

ODI (optical distance indicator ) located where

Back 15

Gantry

Front 16

IMRT

Back 16

Image intensity modulated radiotherapy

Front 17

MLC

Back 17

Multi-leaf collimator

Front 18

IGRT

Back 18

Image guided radiotherapy

Front 19

As depth of Dmax increases the energy of the beam ___________

Back 19

Increases

Front 20

Dose is commonly measured in ?

Back 20

Gray

Front 21

Responsible for directing the photon (X-ray beam) or electron beam at Patients tumor

Back 21

Gantry

Front 22

Name 3 major components of gantry

Back 22

1. Electron gun
2. Accelerator guide
3. Treatment head (inc. ion chamber, collimator jaws, bending magnet)

Front 23

Photon beam measured in?

Back 23

MV

Front 24

ODI (optical distance indicator ) located where

Back 24

Head of Gantry

Front 25

Linear accelerator components

Back 25

1. Drive stand
2. Gantry
3. Treatment couch
4. Control console

Front 26

4 major components that are housed in the stand

Back 26

1. Klystron
2. Waveguide
3. Circulator
4. Cooling stand

Front 27

If ODI is not working can you treat the patient ?

Back 27

No

Front 28

Tray that fits into collimator and contains radio plaque markers

Back 28

Graticule

Front 29

How many cm apart are graticule markers

Back 29

1

Front 30

Cells in what growth cycle are most radio-resistant and why

Back 30

S phase
Because cells are constantly being produced
S- synthesis

Front 31

Central axis

Back 31

Strongest part of beam
Most non-divergent

Front 32

AP/PA portal image will help verify if isocenter needs to be moved in what direction

Back 32

Left or right

Front 33

Rt lat / Lt. lat portal views will help verify if isocenter needs to be moved in what direction

Back 33

Anteriorly or posteriorly

Front 34

Both portal films together will help to verify if isocenter needs to be moved in what direction

Back 34

Inferior or superior

Front 35

In SAD measuring,
SSD will continue to change.
True or false

Back 35

True

Front 36

In SAD measuring the SAD is continuously changing.
True or false

Back 36

False

Front 37

What causes the field size to change with distance from the source?

Back 37

Divergence

Front 38

Divergence

Back 38

The spreading out of the beam

Front 39

Fact: the larger the distance, the larger he field size

Back 39

Doing good girls !!!!!
Don't give up

Front 40

Cells in what phase of cell growth are most sensitive to radiation

Back 40

G2 or mitosis
G2 - second growth phase is when cell gets ready for actual division

Front 41

Normal tissue tolerance doses affected by what 2 factors

Back 41

Volume irradiated
&
Fraction size