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Flashcards in Image Guided Radiotherapy Deck (20):
1

In general most tumours are radio resistant if there not in the?

Treatment beam

2

IGRT is?

External beam radiation therapy with positional verification using imaging prior to each fraction

3

IGRT is not limited to?

3DCRT, IMRT, VMAT, radiosurgery, stereotactic

4

IGRT is used for ?

Positional verification

5

What is a systematic error?

Deviation that occurs in the same direction and of a similiar magnitude for each fraction

6

What is a random error?

Is a deviation that can vary in direction and magnitude during the treatment

7

How do you correct for error?

Margins

GTV-disease we can see
CTV-microscopic disease
PTV-where you treat

8

Is MRI better than CT imaging for certain things?

Yes MRI shows better delineation of soft tissue and water!

9

What movements can we predict?

Bladder filling minute to minute
Respiration
Heart beat both second to second

10

What movements can't we predict?

Skin motion day to day
Prostate motion hour to hour
Neck flex
Peristalsis second to second

11

What is interfractional?

Varies day to day

12

What is intrafraxtional?

Movement during treatment

13

IGRT detects what?

Positional errors weight loss substantial organ deformation changes in respiratory motion

14

Soft tissue matching?

Is matching prostate rectum bladder

15

Skin render?

Outside representation of the patient

16

What are transponders?

Magnetic implants allow for target delineation with out ionising energy used for live tracking

17

How many structures should be used to match?

Three structures

18

Imaging for palliative and radical?

Should be no less rigorous
For palliative patient they expand the margins and tolerance
More comfortable for patients

19

What is the ptv margin

2.5 systematic +0.7 random

20

Reducing margins will?

Spare integral dose