PRI unit 5 exam

Once a predetermined amount of radiation id transmitted through a patient to the AEC detector, which of the following occurs?

• The x-ray exposure increases

• The x-ray exposure decreases

• The x-ray exposure terminates

• The x-ray exposure is extended

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-1

Which automatic exposure device works by converting x-ray photons first into light and then into electronic signal?

• Phototimer

• Gas detector

• Ionization chamber

• Backup timer

Tags

NGSS.HS-PS4-3

Which exposure variable is controlled by the automatic exposure control device?

• kVp

• Focal spot size

• Seconds

• mA

What describes the shortest exposure time required for the AEC device to operate?

• Backup time

• Minimum response time

• Master exposure time

• Phototimer

What is the appropriate setting for backup time/mAs?

• 50% of the expected mAs

• 100% of the expected mAs

• 150% of the expected mAs

• 400% of the expected mAs

What is the purpose of setting a backup time/mAs?

• To prevent excessive exposure of the patient

• To make certain the contrast is acceptable if the chosen kVp is too low

• To make certain the IR exposure is acceptable if the patient moves

• To prevent the selection of the wrong detector

Which of the following is a system that allows the radiographer to select a specific button on the control panel that represents an anatomic area and displays a preprogrammed set of exposure factors?

• mAs readout

• Anatomically programmed technique

• Automatic exposure control

• Phototiming

If AEC the detector is directly exposed to the primary beam during a radiographic study, the IR exposure will be:

• Excessive

• Insufficient

• Correctly exposed

• To have high contrast

In order to become familiar with manual technical factors (I.e., setting MAs and kVp and not using AEC), it is very helpful to pay attention to the :

• Exposure time

• Heat units

• Exposure adjustment control

• mAs readout

With modern x-ray equipment, the AEC systems minimum response time is typically:

• 1 ms

• 10 ms

• 50 ms

• 100 ms

Tags

NGSS.HS-PS4-3