Monday DMI11 9/16 Quiz

Question 0

The smaller the focal spot the…

Answer 0

•smaller the blur

Question 1

Focal spot blur filament size/ shape

Answer 1

• 0.1-1.5

* rectangle shaped

Question 2

Focal spot blur is small when

Answer 2

• OID is small

Question 3

Actual focal spot

Answer 3

•right angle to the face of the anode

Question 4

Effective/apparent focal spot

Answer 4

•right angle to the tube

Question 5

What determines focal spot size

Answer 5

• the mA that is selected

* 25,50,100 mA= small

Question 6

How to minimize blur on a large OID

Answer 6

•Increase SID or SOD

Question 7

If central ray is angled results are

Answer 7

•elongation

Question 8

A fast imaging system will increase or decrease quantum mottle

Answer 8

•increase Quantum mottle

Question 9

Steep H & D curve. Latitude?

Answer 9

• narrow latitude
• short gray scale
• high contrast

Question 10

Wide latitude =

Answer 10

• long gray scale

* low contrast

Question 11

Pneumbra found in the

Answer 11

•cathode side

Question 12

Heel effect

Answer 12

• blur smaller on anode side larger on cathode side

* absorption of X-ray in the heel of the target

Question 13

Increase in 2nd radiation will ____ difinition

Answer 13

•decrease

Question 14

Does radiation dose have anything to do with quality?

Answer 14

•no radiation dose is quantity

Question 15

Quality / penetrability

Answer 15

•kVP

Question 16

Acutance

Answer 16

Abruptness of boundaries

Question 17

Geometric blur

Answer 17

• focal spot size
• SID
• SOD

Question 18

Does film speed have anything to do with geometric blur

Answer 18

•no

Question 19

Density of 0.1 and 0.3head,shoulder or toe?

Answer 19

• 0.1 toe to little density

* 0.3 towards the shoulder more dense

Question 20

Fast image receptors have

Answer 20

• noise

* low spatial & contrast resolution

Question 21

Low kVp=

Answer 21

• high contrast
• short gray scale
• less latitude
• higher patient dose
• not as penetrating

Question 22

If kVp increases Compton..

Answer 22

•Compton decreases

Question 23

What % of X-rays reach the IR

Answer 23

•1%