Exam 11: Scatter Control

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

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

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

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

The air gap technique reduces the amount of scatter radiation reaching the IR because

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

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

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

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 material between the lead strips of a grid must be

The most easily adjusted radiographic beam-restricting device is the

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

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

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

Linear grids are the most commonly used because

The type of grid that is usually taped to the front of an IR is the

The formula to use when changing from one grid to another is

Grids absorb scatter radiation because the scattered photons

The volume of tissue irradiated is determined by

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