B. treatment verification

Question 1

The _____is a point that the gantry, couch, and collimator rotate around

Answer 1

isocenter

Question 2

____can be performed by using table parameters and a coordinate system

Answer 2

Shifts

Question 3

Remember when performing shifts, they are in reference to

Answer 3

isocenter

Question 4

____ isocenter shifts would require a positive table shift. or a addition to current table position.

Answer 4

Anterior, inferior, and right. ** remember AIR

Question 5

The isocenter shifts ______would require a negative shift. OR a subtraction form the current table position

Answer 5

posterior, superior and left

Question 6

if the lateral position of the couch is currently at the coordinate location of 1.5 and there is a right isocenter shift of 10.0, the new shifted couch coordinate should be

Answer 6

11.5cm. (10 + 1.5)

Question 7

if the longitudinal position of the couch is currently at the coordinate location of 150.0 and there is a superior isocenter shift of 5.0, the new shifted couch coordinate should be

Answer 7

145 (150.0-5.0)

Question 8

f the patient is head-first supine and the gantry is at an oblique angle of 45-degrees, the gantry angle would likely be called

Answer 8

LAO

Question 9

if the patient is head-first prone, and the gantry angle is 90-degrees, the gantry angle may be named

Answer 9

right lateral

Question 10

if the patient is feet-first supine, and the gantry angle is 270-degrees, the gantry angle may be named

Answer 10

left lateral

Question 11

As the distance decreases (or gets closer to the source), the field size will measure

Answer 11

smaller than at isocenter

Question 12

As the distance increases (or gets further from the source), the field size will measure

Answer 12

larger than at isocenter

Question 13

______ treatment

Answer 13

2D

Question 14

• based on conventional treatment planning

Answer 14

2D

Question 15

• Uses a conventional simulator with x-ray equipment (fluoro simulation)

Answer 15

2D

Question 16

• Provides a radiographic image with an outline of the tumor and a small margin

Answer 16

2D

Question 17

• Dose distributions are limited to single fields or a few fields

Answer 17

2D

Question 18

______ Treatments based on three-dimensional imaging to create a treatment plan

Answer 18

3D

Question 19

• Most common imaging system is a CT simulator

Answer 19

3D

Question 20

• Anatomy and critical structures are more accurately defined in three dimensions

Answer 20

3D

Question 21

3D treatments use ___planning

Answer 21

forward

Question 22

_____ is a Treatment that includes rotation of gantry with stationary MLCs (not modulated)

Answer 22

Non-volumetric ARC therapy

Question 23

Four-dimensional treatment plan based on

Answer 23

4-D imaging

Question 24

For _____ The radiation beam is on when the tumor is within a specific treatment position (based on a specific breathing cycle); the beam is turned off when the tumor moves out of the treatment position

Answer 24

4D

Question 25

_____ Creates a non-uniform radiation beam in order to optimize the dose to the tumor while minimizing the dose to organs at risk near the tumor

Answer 25

IMRT

Question 26

» MLC movement creates modulated beam

Answer 26

IMRT

Question 27

» Highly conformal beams

Answer 27

IMRT

Question 28

IMRT uses ___ planning

Answer 28

Inverse

Question 29

For ______ Rotational fields are also known as arc therapy, where the radiation is delivered while the gantry is moving in an arc from one set point to another

Answer 29

VMAT

Question 30

____ has better dose distribution than fixed-field IMRT

Answer 30

VMAT

Question 31

_____radiosurgery is a single-fraction, high-dose radiation therapy

Answer 31

Stereotactic

Question 32

For steroitatic radiosurgery Dosimetric accuracy required is

Answer 32

± 5 percent

Question 33

_____ uses an onboard kV source and imager to image the patient prior to treatment when the patient is in their treatment position

Answer 33

kV imaging

Question 34

The kV imager is a flat-panel detector located ____degrees from the kV source

Answer 34

180

Question 35

KV images are

Answer 35

2D

Question 36

kV images are more detailed and have better contrast than

Answer 36

MV images

Question 37

CBCT images are

Answer 37

3-D or volumetric images

Question 38

___ for CBCT is in shape of a cone to cover larger volumes as opposed to fan-beam CTS used in diagnostic or simulation CT scanners

Answer 38

Acquired beam

Question 39

For CBCT, Multiple images are taken at different angles as the gantry rotates, which are then reconstructed to create a

Answer 39

3-D image

Question 40

After reconstruction of CBCT , these images can be viewed in three planes »

Answer 40

Axial, sagittal, and coronal

Question 41

_____ is taken in the beam’s-eye view (BEV), or from the angle and setting the

Answer 41

Portal imaging

Question 42

_____is done before treatments start to verify the treatment plan and then at certain increments throughout treatment as specified on the prescription

Answer 42

Portal imaging