FREE RADIOLOGY AND STUDY GAMES ABOUT SCATTER

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FREE RADIOLOGY AND STUDY GAMES ABOUT SCATTER

CONTROL EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -35 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: grid cassette

Answer:

An IR that has a grid permanently mounted to its front surface

Question 2: grid cap

Answer:

Contains a permanently mounted grid and allows the IR to slide in behind it

Question 3: focused grid

Answer:

Has lead lines that are angled, or canted, to approximately match the angle of divergence of the primary beam

Question 4: cone

Answer:

Essentially an aperture diaphragm that has an extended flange attached

Question 5: aperture diaphragm

Answer:

Simplest type of beam-restricting device, constructed of a flat piece of lead that has a hole in it

Question 6: grid cutoff

Answer:

A decrease in the number of transmitted photons that reach the IR because of some misalignment of the grid

Question 7: nonfocused grid

Answer:

Has lead lines that run parallel to one another; also called a parallel grid

Question 8: grid

Answer:

A device that has very thin lead strips with radiolucent interspaces; intended to absorb scatter radiation emitted from the patient before it strikes the IR

Question 9: linear grid

Answer:

Has lead lines that run in one direction only

Question 10: Bucky

Answer:

The Potter-Bucky diaphragm located directly below the radiographic tabletop, which contains the grid and holds the IR

Question 11: beam-restricting device

Answer:

Changes the shape and size of the primary beam; located just below the x-ray tube housing

Question 12: parallel grid

Answer:

Has lead lines that run parallel to one another; also called a nonfocused grid

Question 13: grid pattern

Answer:

Refers to the linear pattern of the lead lines of a grid

Question 14: focal distance

Answer:

The distance between the grid and the convergent line or point. Also known as the grid radius

Question 15: beam restriction

Answer:

Refers to a decrease in the size of the projected radiation field, also known as collimation

Question 16: positive beam-limiting device (PBL)

Answer:

Automatically limits the size and shape of the primary beam to the size and shape of the IR; also called an automatic collimator

Question 17: lead mask

Answer:

Changes the shape and size of the projected x-ray field; similar to an aperture diaphragm

Question 18: grid conversion factor (GCF)

Answer:

Can be used to determine the adjustment in milliampere/second needed when changing from using a grid to a non-grid (or vice versa) or for changing to grids with different grid ratios; also called the Bucky factor

Question 19: crossed grid

Answer:

Has lead lines that run at a right angle to one another

Question 20: Bucky factor

Answer:

Can be used to determine the adjustment in milliampere/second needed when changing from using a grid to non-grid (or vice versa) or for changing to grids with different grid ratios; also called the grid-conversion factor (GCF)

Question 21: grid ratio

Answer:

The ratio of the height of the lead strips to the distance between them

Question 22: convergent line

Answer:

An imaginary line if points were connected along the length of a linear focused grid

Question 23: collimation

Answer:

Refers to a decrease in the size of the projected radiation field, also known as beam restriction

Question 24: grid frequency

Answer:

Expresses the number of lead lines per unit length in inches, centimeters, or both

Question 25: wafer grid

Answer:

A stationary grid placed on top of the IR

Question 26: air gap technique

Answer:

Method for limiting the scatter reaching the IR. Scatter will miss the IR if there is increased distance between the patient and IR

Question 27: grid focus

Answer:

The orientation of a grid's lead lines to one another

Question 28: focal range

Answer:

The recommended range of SID measurements that can be used with a focused grid