Thursday Quiz (Last Week)

Question 1

Scatter radiation is the result of-

Answer 1

Compton interaction

Question 2

High energy of xray photons will they decrease or increase probability of Compton?

Answer 2

Increase

Question 3

Volume of tissue irradiated, what can determine it?(3)

Answer 3

1. -patient thickness 2. Attention of beam 3. Field size

Question 4

Gives us most (increase) scatter radiation exiting the patient will be (2)

Answer 4

1. High k.v.p 2. Large field size

Question 5

Primary beam is what shape (naturally)

Answer 5

Round shape

Question 6

How does collimation affect field size & volume of tissue -

Answer 6

Increasing. Collimation, less tissue will be irritated

Question 7

If collimating is tighter -

Answer 7

We increase the MAs

Question 8

Abecture diaphragm-

Answer 8

Piece of metal w/ hole in it

Question 9

What happens to edges in abecture diaphragm?

Answer 9

They are blurred, unsharp edge

Question 10

Primary beam original shape? -

Answer 10

Round

Question 11

Where’s the grid located?

Answer 11

Between patients & Ir

Question 12

Automatic collimator does what? -

Answer 12

Collimates Ir size automatically

Question 13

Grids absorbs scatter radiation why? -

Answer 13

Travel @ angle transmitted

Question 14

What’s grid frequency?

Answer 14

Of lines per inch/ cm.

Question 15

Ratio grid?

Answer 15

Space and height

Question 16

Grid ratio formula?

Answer 16

Height divided by distance

Question 17

Higher ratio does what?

Answer 17

Absorbs more scatter