Immobilization Devices

Question 1

Why are immobilization devices used?

Answer 1

1. reproducibility
2. accuracy
   - not moving, losing marks
   - no change/ alteration
   - allow for specific positioning

Question 2

missing a tumor __-__ times can result in failure of treatment

Answer 2

1,2

Question 3

__ % or greater in differences in dose result in possible failure of treatment

Answer 3

10

Question 4

In a study, __% of patients had errors in treatments.

-chest, abdomen, pelvis

Answer 4

15

Question 5

3 categories of immobilization Devices

Answer 5

1. Patient positioning aids
2. Simple Imm Dev
3. Complex Imm Dev (customized)

Question 6

PPA-TX sponges

Answer 6

A-F
B= neutral
C= chin elevated a little bit
F= raises head

Question 7

PPA-Prone Pillow

Answer 7

supports chest
head up
arms need to be in the same position every time

Question 8

PPA-Arm Board

Answer 8

gets arms out of treatment field

Question 9

Simple Immobilization devices- bite block

Answer 9

do restrict movement, not as much as complex

• in addition to positioning aids
• tape, velcro, bite blocks, arm & foot straps

Question 10

arm stretcher

Answer 10

for head and neck treatments, to get shoulders out of the way
Indicators for how long it needs to be

Question 11

complex immobilization devices- Alpha Cradle

Answer 11

restrict patient movement
reproducibility
*styrofoam
*cannot reuse alpha cradles
Advantage of aquaplast- you can mark on it
*heat to 160 degrees

Question 12

complex immobilization devices- vac bag

Answer 12

let air out

let it in if you mess up

Question 13

complex immobilization devices- aquaplast mask

Answer 13

can attenuate beam

-cut out as little as possible