Week 11 - Exposure Technique Selection

Question 1

First generation AEC

Answer 1

Phototimers

Question 2

Exit type
Detectors behind IR

Answer 2

Phototimers

Question 3

What uses light paddles to detect X-rays?

Answer 3

Phototimers

Question 4

Entrance type
Detectors are in front of the IR

Answer 4

Ionization chambers

Question 5

Are less sophisticated and less accurate than phototiners but they are less prone to failure

Answer 5

Ionization chambers

Question 6

The shortest exposure time that the system can produce (usually 1ms)

Answer 6

Minimum response time

Question 7

Density adjustments by 25%

Answer 7

-2,-1,0,+1,+2
Related to patient size
Increased density control setting = increased exposure

Question 8

Baseline kvp is increased by 2 for every 1cm increase in part thickness; mas is maintained

Answer 8

Variable kvp/fixed mas charts

Question 9

Double the mas for every 4-5cm in body part thickness

Answer 9

Fixed kvp/variable mas

Question 10

What tools are needed to create a technique chart?

Answer 10

Phantoms, calipers, calculator