Th - Pre-treatment imaging Radiotherapy Flashcards

1
Q

What kind of radiation is used for CT imaging?

A

High energy photons

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2
Q

What kind of radiation is used for radiotherapy?

A

Even higher energy photons

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3
Q

Does CT account for a dose burden?

A

Yes, it does (mSv)

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4
Q

Why is target delineation so important in radiotherapy (RT)?

A

Needs to encompass the tumor (and spread)

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5
Q

How do we handle delineation uncertainties?

A

Apply margins

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6
Q

What kind of error is a delineation error?

A

Delineation is systematic (not random) and is thus a large component in the margin.

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7
Q

An error in the co-registration lead to what kind of error?

A

Systematic

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8
Q

Co-registration of multiple modalities have residual mismatches. Can you name a few reasons for these mismatches? (3)

A

Inter-observer error
Organ motion
Organ deformation

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9
Q

What are ways to incorporate respiratory motion in radiotherapy? (4)

A

Increase margins
Gated RT (beam on/off)
Tracking (following the motion)
Minimize respiratory motion (breath-holding)

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10
Q

Give examples on how pre-treatment CT is enhanced for RT (1)

A

-> personalized treatment

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11
Q

What are in general the main reasons why imaging is always performed before any radiotherapy treatment is delivered. (4)

A

Tumor location/extent Motion, organ motion, characterisation

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12
Q

What is the trade off-challenge in radiation therapy?

A

The trade-off challenge is do you want to put in more radiation and kill the tumor, but it will also kill off the surrounding tumor? Or other way around?

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13
Q

Explain why cancer radiotherapy needs to be personalized

A

Needs to be personalized because no two people and tumours are the same

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