AEC

Timing

100

The single function of an AEC is to eliminate the need to set

exposure time

200

The backup time of most AECs is set at ___% of the anticipated manual exposure time.

150% - 200%

300

How long is the minimum response time in most modern AEC systems?

1ms

400

Federal law requires AEC to shut off at 600 mAs when operating above which kVp?

50 kVp

500

If exposure shuts off prematurely, the resultant image will be

underexposed

Detector Selection

100

When an AEC is used for a PA chest, which ionization chambers are utilized?

Two outer cells

200

When an AEC is used for a pelvis, which ionization chambers are utilized?

two outer cells

300

When an AEC is used for an AP lumber spine, which ionization chambers are utilized?

Center cell

400

When an AC is used for an AP abdomen, which ionization chambers are utilized?

All 3 cells

500

When an AEC is used for an AP hip, which ionization chambers are utilized?

center cell

Misc.

100

Safety mechanism in place that prevents overexposure to patient

backup timer

200

Early versions of AEC technology were referred to as

phototimers

300

AEC was introduced by

Russell H. Morgan

400

+2 used when N would have been optimum will result in an ____ image

overexposed 

500

The ionization chamber is located ____ the IR

before/ in front of

T/F

100

T/F: Phototimer is located in front of the IR

False; behind 

200

Collimation does not influence the effectiveness of AEC

False

300

-200, -100, 0, +100, +200 are referring to density controls

false; -2, -1, 0, +1, etc

400

Most modern AEC systems provide a minimum response time of .001 sec

true

1 millisecond
1/1000 sec
.001 sec

500

AEC allows radiographer to select which chamber(s), kVP, and mAs

False; cannot select mAs (time)