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Rad 400 Test 1 Questions And Answers

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RAD 400 TEST 1 QUESTIONS AND ANSWERS

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46 Multiple choice questions

Term 1 of 46
Increase energy, hotspot?

Increase

Decrease

increases

(Decrease TAR)

Decreases

Term 2 of 46
Increase field size, PDD?

decreases

Increase

Decrease

Increase


(Increase TAR)

Term 3 of 46
Increase energy, PDD?

Increase SSD = increase PDD


increases

(Decrease TAR)


Increase


Decrease

,Term 4 of 46
Tray factor increases, MU?

Dose w/ wedge / Dose w/out wedge



ALWAYS < 1


decreases

Increase


Decrease

Term 5 of 46
Increase SDD, penumbra?

Decrease


Decreases

increase

Increase SSD = increase PDD

Term 6 of 46
wedge factor, ____ Mu?

Decrease


Increase

Decreases

Dose w/ wedge / Dose w/out wedge



ALWAYS < 1

,Term 7 of 46
Use wedge when tumor size

0-7 cm deep


Increase

decreases

More scatter

Term 8 of 46
Increase thickness, uniformity?

increase


Decrease

Increase SSD = increase PDD

Decreases

Term 9 of 46
Increase SSD = ________ PDD

Increase SSD = increase PDD

Increase

(Increase TAR)

increase

increases


(Decrease TAR)

, Term 10 of 46
Wedge angle

angle of the isodose line at a 10 cm depth at central axis


Steep gradient
Rapidly changing
2 cm away from block edge

Together
Both heels where they overlap/ shallow


CTV + margin that accounts for tumor motion

Term 11 of 46
MU=

50% idodose line

GD/ (ScxSpxWF)


50% isodose line

More scatter

Term 12 of 46
Increase energy, MU?

Decrease


increases

(Decrease TAR)

Decreases

Increase

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