LRA 222 Final Review

To produce x-rays, a cloud of electrons are necessary and the cathode must have a strong positive charge.

Reducing the amount of scatter radiation reaching the IR results in:

Increasing collimation (decreasing the field size) results in:

A flat piece of lead with a hole in it that has a flange directed toward the patient is a(n):

The motor that turns the anode operates through what?

Adding a grid or increasing grid ratio results in an increase in patient dose.

Absorption of transmitted photons by a grid caused by misalignment is:

The step-down transformer is found on the:

The formula for the grid conversion factor is:

Grids absorb scatter radiation because the scattered photons:

Grids are typically used when:

When imaging the pelvis, changing from 14 × 17 collimation to 8 × 10 collimation requires:

When using automatic collimation, collimating to the anatomy of interest is an unnecessary waste of time.

What does the cathode include?

The focusing cup is able to keep the electrons together because:

When the x-ray beam is angled across the lead strips you have _________ cutoff.

The rate of flow of electrons passing through the x-ray tube during an exposure is:

With a rotating anode, the focal spot becomes a focal:

What component of the X-ray tube is responsible for producing electrons?

For radiographic procedures, scatter radiation is primarily the result of:

The timer circuit is found on the:

Which of the following is true regarding the effect of mAs on the brightness of a digital image?

The unrestricted primary x-ray beam shape is:

What is the relationship between kVp and subject contrast?

To compensate for the reduction of radiation reaching the IR when a grid is used, ___________ is typically increased.

The number of lead lines per inch or centimeter is the grid:

In addition to the oil surrounding the tube, mechanical fans help to eliminate the heat produced during x-ray production

The devices that change alternating to direct current are the:

The primary side of the high-voltage transformer is found on the:

A grid with lead strips that run parallel to each other is a:

The recommended SIDs that can be used with a focused grid is the:

The beam-restriction device that results in images with the most unsharpness around the edge of the image is the:

With digital imaging, if the mAs is too high:

Anyone in the room during an exposure must wear a lead apron to absorb the scatter radiation produced in the:

Linear grids are the most commonly used because:

The two major factors that affect the amount of scatter radiation produced and exiting the patient are:

Grids absorb almost all of the scatter radiation and allow all of the transmitted photons to pass through to the IR.

The main power switch is found where?

To overcome the decrease in sharpness caused by the air gap technique, an increase in SID is required.

Which of the following factors need to be considered when determining the grid to be used for a specific examination?

Higher kVp results in less absorption and more variation in the intensities exiting the patient.

An IR that has a grid permanently attached to its front surface is a:

Which of the following statements is true regarding practices to minimize patient exposure?

The air gap technique is based on creating a gap by increasing the ______.

To maintain the same exposure to the IR, if the SID is increased, the mAs must be:

The volume of tissue irradiated is determined by:

For a lateral lumbar spine, placing a lead shield on the table behind the area of exposure:

The most effective and often used radiographic beam-restriction device is the:

The effective focal spot is smaller than the actual focal spot because the face of the anode is angled.

The only grid cutoff error that can occur with a parallel grid is:

The grid is part of a device located just below the tabletop that also includes a tray to hold the IR This device is the

Prepping the rotor but not making an exposure on a regular basis is related to tube damage or failure.

Grid cutoff results in:

The x-ray tube (not filaments) is found on the:

Which of the following occurs first in the sequence of events leading to x-ray production?

 AEC controls the ________________ of radiation reaching the image receptor.

Place the following events leading to the production of x-rays in order, from first to last:

The device that adjusts the incoming power supplied to the x-ray circuit to maintain 220 V is the:

The device used to absorb scatter radiation leaving the patient before it reaches the image receptor is the

If all the convergent points were connected along the length of the grid they would form the:

The automatic collimator:

What does the anode include?

The relationship between the height of the lead strips and the distance between them is the grid:

The purpose of the filament circuit is to:

To compensate for some of the loss of SR due to the large OID used with the air gap technique, the ________

The field shape produced by a collimator is:

Which of the following is not a primary exposure technique factor?

When the SID is above or below the focal range you have _________ cutoff.

Using a higher the grid ratio will:

The stator is made up of:

The grid is located:

Place the following events leading to the production of x-rays in order, from first to last:

The primary purpose of the step-down transformer is to:

Which of the following produces the greatest amount of scatter radiation exiting the patient?

Scatter radiation is of no value in radiographic imaging.

Which of the following is the formula used to determine grid ratio?

Place the following events leading to the production of x-rays in order, from first to last:

The probability of a Compton interaction occurring is related to:

The distance between the grid and the convergent line is the:

The Moiré effect can be caused by:

A significant amount of collimation will have what effect on the amount of radiation:

Using excessive kVp with a digital IR results in:

What is the grid ratio if the lead strips are 2.4 mm high, 0.02 mm wide, and 0.3 mm apart?

The grid limits the amount of scatter radiation produced in the patient.