Question 1

When imaging a patient's right hip, which detector(s) should be activated?

Accepted Answer

A)  right detector only 
B)  right and left detector 
C)  center detector only 
D)  all three detectors

Question 2

With digital imaging using AEC, if an AP thoracic spine is imaged using an outside instead of center detector, the brightness in the area of interest will be _________________ and the patient will be underexposed. (Assume all other factors are appropriate.)

Accepted Answer

A)  gray 
B)  light 
C)  dark 
D)  appropriate

Question 3

When the radiographer has the opportunity to set the back-up time, it should be approximately _____________ of the expected exposure time

Accepted Answer

A)  50% 
B)  150% 
C)  250% 
D)  600%

Question 4

If an AEC has three detectors, only one of the three can be selected for an exposure.

Accepted Answer

A) True 
 B)False

Question 5

When your patient for an AP abdomen is very heavy, using AEC results in

Accepted Answer

A)  underexposure to the IR 
B)  overexposure to the IR 
C)  appropriate exposure to the IR 
D)  increased image contrast

Question 6

When the x-rays enter the ionization chamber

Accepted Answer

A)  atoms become ions 
B)  atoms give up electrons 
C)  electrons and positive ions become electricity 
D)  All of these

Question 7

With digital imaging using AEC, what factor is decreased if an AP thoracic spine is imaged using an outside instead of the center detector? (Assume all other factors are appropriate.)

Accepted Answer

A)  exposure time 
B)  increased; subject contrast 
C)  spatial resolution 
D)  brightness

Question 8

With digital imaging using AEC, if an AP thoracic spine is imaged with the central ray passing 3 inches to the right of the spine, the right lung exposure is _________________. (Assume all other factors are appropriate.)

Accepted Answer

A)  excessive 
B)  insufficient 
C)  sufficient 
D)  too long

Question 9

Today's AEC system is most likely use a(n)

Accepted Answer

A)  ionization chamber 
B)  Geiger counter 
C)  phototimer 
D)  none of these

Question 10

Phototimer AEC detectors are usually exit-type devices because

Accepted Answer

A)  the x-rays must exit the patient to get to the detectors 
B)  the x-rays must exit the grid to get to the detectors 
C)  the x-rays must exit the image receptor to get to the detectors 
D)  the x-rays must exit the table to get to the detectors

Question 11

When using AEC, the exit radiation is converted into an electrical signal.

Accepted Answer

A) True 
 B)False

Question 12

With digital imaging using AEC, if an AP thoracic spine is imaged with the exposure adjustment changed from 0 to +2, the exposure time is _______________________. (Assume all other factors are appropriate.)

Accepted Answer

A)  longer 
B)  shorter 
C)  unchanged 
D)  insufficient

Question 13

Which of the following is the most critical aspect of successfully performing an examination using AEC?

Accepted Answer

A)  Centering the anatomy of interest over the detector 
B)  Using the right mA 
C)  Using the right kVp 
D)  Setting the best back-up time

Question 14

If the AEC detectors are not completely covered by the part being imaged and are exposed to primary radiation

Accepted Answer

A)  the patient will be overexposed 
B)  the exposure will terminate very quickly 
C)  the IR will be exposed to the appropriate amount of radiation 
D)  none of these

Question 15

Different radiographic projections and patient positions of the same anatomic part do not require modification of the exposure factors.

Accepted Answer

A) True 
 B)False

Question 16

If the back-up time is set by the equipment, the exposure time should end when the mAs reaches

Accepted Answer

A)  100 
B)  400 
C)  600 
D)  1000

Question 17

An ionization chamber is a hollow cell that contains

Accepted Answer

A)  water 
B)  lead 
C)  tungsten 
D)  air

Question 18

Phototimer AEC devices convert the radiation to light energy.

Accepted Answer

A) True 
 B)False

Question 19

In imaging a child, a short exposure time is needed for an examination using AEC. The mA setting should

Accepted Answer

A)  be low 
B)  be mid-range 
C)  be high 
D)  It doesn't matter-the AEC device will control the exposure time

Exam 13: Exposure Technique Selection

When imaging a patient's right hip, which detector(s) should be activated?

With digital imaging using AEC, if an AP thoracic spine is imaged using an outside instead of center detector, the brightness in the area of interest will be _________________ and the patient will be underexposed. (Assume all other factors are appropriate.)

When the radiographer has the opportunity to set the back-up time, it should be approximately _____________ of the expected exposure time

If an AEC has three detectors, only one of the three can be selected for an exposure.

When your patient for an AP abdomen is very heavy, using AEC results in

When the x-rays enter the ionization chamber

With digital imaging using AEC, what factor is decreased if an AP thoracic spine is imaged using an outside instead of the center detector? (Assume all other factors are appropriate.)

With digital imaging using AEC, if an AP thoracic spine is imaged with the central ray passing 3 inches to the right of the spine, the right lung exposure is _________________. (Assume all other factors are appropriate.)

Today's AEC system is most likely use a(n)

Phototimer AEC detectors are usually exit-type devices because

When using AEC, the exit radiation is converted into an electrical signal.

With digital imaging using AEC, if an AP thoracic spine is imaged with the exposure adjustment changed from 0 to +2, the exposure time is _______________________. (Assume all other factors are appropriate.)

Which of the following is the most critical aspect of successfully performing an examination using AEC?

If the AEC detectors are not completely covered by the part being imaged and are exposed to primary radiation

Different radiographic projections and patient positions of the same anatomic part do not require modification of the exposure factors.

If the back-up time is set by the equipment, the exposure time should end when the mAs reaches

An ionization chamber is a hollow cell that contains

Phototimer AEC devices convert the radiation to light energy.

In imaging a child, a short exposure time is needed for an examination using AEC. The mA setting should