RADR 2305 - Radiographic Imaging and
Exposure - Chapter 8 Questions and Answers
(100% Correct Answers) Already Graded A+
Automatic Exposure Control (AEC) [ Ans: ] A device that
terminates the exposure when a specific quantity of
radiation has reached the image receptor (IR)
What does the AEC automatically adjust based on patient
characteristics, like anatomy and tissue density? [ Ans: ]
The duration or intensity of the x-ray beam
Why was automatic exposure control (AEC) developed? [
Ans: ] To determine the radiation exposure required to
produce a quality image
What does/can the radiographer control while using an
AEC system? [ Ans: ] kVp, mA, IR, and grid
Which exposure variable is controlled by the automatic
exposure control device? [ Ans: ] Exposure time (seconds)
Exposure terminates when the ideal ______ is received. [
Ans: ] Signal
Almost all AEC systems use a set of three radiation-
measuring detectors, arranged in a specific manner,
called: [ Ans: ] Sensors or cells
How many detectors are typically found in an AEC
system? [ Ans: ] Three
,AEC can be used with tabletop examinations; true or false?
[ Ans: ] False
When doing a tabletop forearm study, you should: [ Ans: ]
Set a manual technique
A common cause for repeating images done with AEC is
inaccurate: [ Ans: ] Centering
What are the two types of AEC systems? [ Ans: ]
Phototimers and ionization chambers
Phototimer [ Ans: ] A type of AEC that uses a fluorescent
light screen and a device that converts light into
electricity
Phototimers are considered: [ Ans: ] Exit-type devices
Exit-type devices [ Ans: ] Radiation exits the IR then gets
measured by the detectors positioned directly behind it
Where is the sensor located in an automatic exposure
device that converts light into an electrical signal? [ Ans: ]
Behind the IR
What is coated with fluorescent material and serves as the
detectors in a phototimer AEC device? [ Ans: ] Light
paddles
In phototimers, radiation interacts with light paddles to
produce visible light, then send that light to
, photomultiplier tubes or ___________ to convert it into
electricity. [ Ans: ] Photodiodes
Which automatic exposure device works by converting x-
ray photons first into light and then into electronic signal?
[ Ans: ] Phototimer
What is the electrical charge in phototimers proportional
to? [ Ans: ] The amount of radiation the light paddles
receive
The most common type of AEC system used today is the
phototimer; true or false? [ Ans: ] False
Ionization Chamber Systems [ Ans: ] A type of AEC that is
an air-filled hollow cell that is connected to a timer via an
electrical wire
Which automatic exposure device works by using a gas-
filled chamber? [ Ans: ] Ionization chamber
Ionization chambers are considered: [ Ans: ] Entrance-type
devices
Entrance-type devices [ Ans: ] Radiation interacts with the
detectors positioned in front of the IR before interacting
with the IR
Where is the sensor located in an automatic exposure
device with a gas-filled chamber? [ Ans: ] In front of the IR
Exposure - Chapter 8 Questions and Answers
(100% Correct Answers) Already Graded A+
Automatic Exposure Control (AEC) [ Ans: ] A device that
terminates the exposure when a specific quantity of
radiation has reached the image receptor (IR)
What does the AEC automatically adjust based on patient
characteristics, like anatomy and tissue density? [ Ans: ]
The duration or intensity of the x-ray beam
Why was automatic exposure control (AEC) developed? [
Ans: ] To determine the radiation exposure required to
produce a quality image
What does/can the radiographer control while using an
AEC system? [ Ans: ] kVp, mA, IR, and grid
Which exposure variable is controlled by the automatic
exposure control device? [ Ans: ] Exposure time (seconds)
Exposure terminates when the ideal ______ is received. [
Ans: ] Signal
Almost all AEC systems use a set of three radiation-
measuring detectors, arranged in a specific manner,
called: [ Ans: ] Sensors or cells
How many detectors are typically found in an AEC
system? [ Ans: ] Three
,AEC can be used with tabletop examinations; true or false?
[ Ans: ] False
When doing a tabletop forearm study, you should: [ Ans: ]
Set a manual technique
A common cause for repeating images done with AEC is
inaccurate: [ Ans: ] Centering
What are the two types of AEC systems? [ Ans: ]
Phototimers and ionization chambers
Phototimer [ Ans: ] A type of AEC that uses a fluorescent
light screen and a device that converts light into
electricity
Phototimers are considered: [ Ans: ] Exit-type devices
Exit-type devices [ Ans: ] Radiation exits the IR then gets
measured by the detectors positioned directly behind it
Where is the sensor located in an automatic exposure
device that converts light into an electrical signal? [ Ans: ]
Behind the IR
What is coated with fluorescent material and serves as the
detectors in a phototimer AEC device? [ Ans: ] Light
paddles
In phototimers, radiation interacts with light paddles to
produce visible light, then send that light to
, photomultiplier tubes or ___________ to convert it into
electricity. [ Ans: ] Photodiodes
Which automatic exposure device works by converting x-
ray photons first into light and then into electronic signal?
[ Ans: ] Phototimer
What is the electrical charge in phototimers proportional
to? [ Ans: ] The amount of radiation the light paddles
receive
The most common type of AEC system used today is the
phototimer; true or false? [ Ans: ] False
Ionization Chamber Systems [ Ans: ] A type of AEC that is
an air-filled hollow cell that is connected to a timer via an
electrical wire
Which automatic exposure device works by using a gas-
filled chamber? [ Ans: ] Ionization chamber
Ionization chambers are considered: [ Ans: ] Entrance-type
devices
Entrance-type devices [ Ans: ] Radiation interacts with the
detectors positioned in front of the IR before interacting
with the IR
Where is the sensor located in an automatic exposure
device with a gas-filled chamber? [ Ans: ] In front of the IR
