1. Data

Question 1

X-ray

Answer 1

A photograph

A photon

2 dimensional representation of patient

Question 2

Fluoroscopy

Answer 2

Real time x-ray

Watch patient move

Uses only internal bony anatomy

Question 3

DRR

Answer 3

Digitally Reconstructed Radiograph

Created from manipulation of CT data into 2 dimensional form

Question 4

Port film

Answer 4

A hard film X-ray taken on treatment unit of treatment beam

This is old school

Question 5

EPI or EPID

Answer 5

Electronic portal image taken on the treatment unit

Question 6

Orthogonal films “orthogs”

Answer 6

Two films taken 90 degrees apart used to locate or represent isocenter

Question 7

Image matching

Answer 7

Comparing the planned image to daily treatment position images.

Question 8

Name some simulators used in RT

Answer 8

Fluoroscopic- not used anymore
CT
PET
MRI-future

Question 9

CT sim

Answer 9

3D planning

Result are DRRs (create a DRR with CT info)

Topogram (scout or pilot) scan is performed to set borders

Question 10

What are the functions of an immobilization device

Answer 10

Major functions:
Immobilization
Reproducibility

Minor functions:
Provide room for marks
Provide surface for lead or bolus

Question 11

Name some immobilization devices

Answer 11

Simple:
Ankle rest
Masking tape
Velcro
Rubber bands
Arm-foot strap
Foam cushions 
Pillows
Head rests 

Complex:
Cast or face mask 
Vac lock bag
Bite block
Thermoplastic moulds 
Breast board

Question 12

What is a contour & why do we need them

Answer 12

A reproduction of an external body shape, it is a 2 dimensional representation of a 3 dimension subject

Provides the planners with a replica of patients body shape to dose accurately and to watch or OARs