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Flashcards in Simulator Design and Operation Deck (33)
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1

Primary purpose of simulator

levels target volume
collect anatomic info

2

Basoc elements of simulator

-gantry: rotates 360
-PSA (patient support Assembly): couch where pt lays
-x ray tube
-collimater device
-imaging system of fluoro unit
-optical devices: lasers, light field

3

3 parts of treatment palnning

- tumor localization
- computation of dose distributions
- fabrication of treatment aids

4

What is DRR?

digital reconstructed radiograph

5

Set up functions of simulation

-tumor localization
-treatment verification

6

Who determines the extent and localization of tumor

the physician

7

Who sets the isocenter and field margins

dosimetrist

8

designed to simulate the mechanical, geometrical,a dn optical conditions of various treatment untis

conventional sim

9

What is is the tolerance for the gantry angle?

1 degree

10

Mechanical components:
gantry

arm
head
image intensifying/ film holder system

11

360 degrees
rotates along isocenter @ 100 cm
divergent edge
central axis is nondivergent

Gantry

12

patient's right is always __ degrees
patient's left is always ___ degrees

270
90

13

Varian machine, top is __ degrees
IEC machine, top is ___ degrees

180
0

14

Gantry head components:
collimator assembly

comprises gantry head and rotates

15

Gantry head components:
ODI

optical distance indicator
number readout
corresponds to SSD/ who deep we are going

16

Gantry head components:
field defining wires

represent diaphragms on machine

17

Gantry head components:
beam restricting diaphragms

determine size of x-ray beam

18

Gantry head components:
fudicial plate

plate with hashmarks, measurement
can also measure magnification

19

Gantry head components:
accessory holder

holds blocks and whatever needed for treatment
distance should be the same

20

OFD

object to field distance

21

SFD

source to film distance

22

TFD

target to film distance

23

SSD

source to skin distance

24

IFD

intrafield distance

25

IT

isocenter to table top

26

Positioning lasers

red or green
for positioning external landmarks (tattoos)
QA lasers

27

Types of Sim:

1. conventional- old method
2. conventional& CT- old method
3. virtual- current method

28

Two main functions of CT sim:

1. target localization and localization of clerical structures
2. have DRR printed out

29

+ of CT sim

-mark patient
-able to transfer data from one system to another

30

multiple sources to get anatomical data for patient

fusion