Unit 2 Notes

Question 1

Tg-71 defines calibration for monitor units as?

Answer 1

Unit of output to deliver I mu @ the depth of Dmax
W/ FS 10x10 & distance @ 100cm

Question 2

Increase in beam energy affects the PDD how?

Answer 2

More penetrating?

Question 3

How does an increase in beam energy affect Dmax?

Answer 3

Increase DMAX W/ increase beam energy

Question 4

Dmax of cobalt 60

Answer 4

0.5cm

Question 5

Dmax of 4MV

Answer 5

1.0cm

Question 6

Dmax of 6MV

Answer 6

1.5cm

Question 7

Dmax of 10 MV

Answer 7

2.5cm

Question 8

Dmax of 18MV

Answer 8

3.0 cm

Question 9

Increase FS affects PDD how?

Answer 9

Increase PDD

Question 10

How does the output change for a greater than 10cm FS

Answer 10

Decrease output

Question 11

How does an increase in SDD affect PDD?

Answer 11

Direct , increase pdd w/ increase SSD

Question 12

Question 15 homework