Scatter Reduction

Question 1

The Primary photons which traverse the patient carry…

Answer 1

the image data

Question 2

The scattered photons…

Answer 2

degrade the image

Question 3

Scatter_____ image contrast

Answer 3

Scatter reduces image contrast

Question 4

Ways of reducing scatter

Answer 4

• Collimation
• Patient compression
• Anti-scatter grid
• Air gap technique
• Reduce kVp (increases patient dose)

Question 5

What is collimation?

Answer 5

reduces the beam filed size therefore decreasing scatter

includes a series of blades made of lead

Question 6

When is patient compression used, and how does it improve images?

Answer 6

Mammography

It improves both contrast and spatial resolution

Question 7

What are anti-scatter grids made of?

Answer 7

Composed of lead strips separated by either aluminium
or carbon fibre interspaces

Question 8

Anti-scatter grids are very thin or thick?

Answer 8

Thin

Question 9

Which photons can reach the image receptor through the grid?

Answer 9

The photons travelling parallel to the septa

Question 10

Disadvantages associated with grids

Answer 10

while they improve image contrast they increase patient dose!