B. treatment planning parameters

Question 1

Measurements of the treatment field are defined at the

Answer 1

isocenter

Question 2

The field size is created by two pairs of the

Answer 2

secondary asymmetric collimator jaws

Question 3

DRRs are a document of the

Answer 3

field parameters

Question 4

The physical radiation field size is delineated at the

Answer 4

50 Percent isodose line

Question 5

Tumor depth can be established with

Answer 5

3-D imaging

Question 6

___of the tumor determines the energy of the beam and the type of treatment

Answer 6

Depth

Question 7

Superficial tumors are most likely to be treated with

Answer 7

electrons

Question 8

Deeper tumors are most likely to be treated With

Answer 8

photons

Question 9

When a treatment is at “midplane” this means the isocenter is located

Answer 9

halfway between the patient separation

Question 10

if a patient’s separation is 30 cm, then midplane would be at a depth of

Answer 10

15 cm

Question 11

_____= Distance from the source of radiation to the patient’s skin surface

Answer 11

SSD = source-to-surface distance

Question 12

If using an isocentric or SAD technique, the SSD will change at

Answer 12

different gantry angles

Question 13

For _______, the SSD is 100 cm or another specified ‘fixed” SSD

Answer 13

SSD techniques

Question 14

_____= Distance from the source of radiation to the isocenter

Answer 14

SAD = source-to-axis distance

Question 15

In current linear accelerators, the SAD is

Answer 15

100 cm

Question 16

In older Cobalt-60 machines, the SAD was

Answer 16

80 cm

Question 17

Isocentric technique is when the isocenter is located within the patient meaning The SSD is

Answer 17

less than 100 cm

Question 18

The secondary collimating jaws are

Answer 18

moveable, asymmetric, and made of tungsten

Question 19

As field size increases, collimator scatter is ____

Answer 19

increased

Question 20

The Collimator can rotate ___-degrees, which may be helpful to shape the treatment beam

Answer 20

360

Question 21

_____ meet at a determined depth within the patient because of beam divergence

Answer 21

Abutting fields

Question 22

during abutting fields To avoid hot spots, there must be a ___on the skin surface

Answer 22

gap

Question 23

What is the gap calculation

Answer 23

( L1 / 2 x d / SSD1) + ( L2 / 2 x d / SSD2)

Question 24

abutting fields are Commonly used in

Answer 24

craniospinal irradiation (CSI)

Question 25

_______ is a technique used to move or change the location of the gap throughoutthe treatment

Answer 25

Feathering

Question 26

Multiple studies from different imaging modalities can be fused together to give more information to

Answer 26

treatment planners and physicians

Question 27

It is common to fuse together

Answer 27

MRI and CT images or PET and CT images

Question 28

MRI and CT scans are commonly fused together to better visualize the

Answer 28

prostate

Question 29

PET and CT scans are commonly fused together to show areas of activity in sites such as the

Answer 29

lung, and head and neck