Exam 11: Scatter Control

If a shoulder examination is done using an 8:1 ratio grid and 12 mAs,how much mAs should be used if the examination must be done tabletop (no grid)?

The location in space where all the lines extended from the lead strips meet is the:

To compensate for some of the loss of recorded detail due to the large OID used with the air gap technique,the ________ should be increased as well.

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

If a tabletop exposure (no grid)of a humerus requires 2.5 mAs,how much mAs is needed if a 12:1 ratio grid is added?

The field shape produced by a collimator is:

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

The unrestricted primary x-ray beam is:

The cutoff that appears as a strip of appropriate density in the middle of the image and a significant loss of density on both sides is:

What is the grid ratio if the grid frequency is 100 lines/inch,and the lead strips are 1.8 mm high and 0.3 mm apart?

Grids are typically only used when the part measures more than ________ cm and ______ kVp is needed for the examination.

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

Beam-restricting devices are located just above the tube housing.

The beam-restriction device that includes a visible light projecting the x-ray field size onto the patient is the:

If 22 mAs and a 5:1 grid results in an excellent radiograph,how much mAs is needed with a 12:1 grid?

The most easily adjusted radiographic beam-restricting device is the:

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

As compared with lower kVp exposures,when using high kVp the energy of the scattered photon is:

Restriction of the primary beam to the anatomy of interest:

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