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scatter radiation

caseys summer class

What three factors contribute to an increase in scatter radiation Increased kvp, increased x ray field size, and increased anatomic part thickness
Which two kinds of x rays are responsible for optical density on a radiograph Those that pass through the patient without interacting and those that are scattered in the patient through Compton interaction.
How does an increase in kVp affect scatter radiation Scatter increases as kVp increases.
How does field size affect the level of scatter radiation As field size is decreased, scatter decreases.
How does increased anatomic part thickness affect scatter radiation As anatomic part thickness increases, scatter radiation increases.
How can the reduction of scatter radiation reaching the film be accomplished By using collimators, grids, and compression.
How does compression affect patient dose and image contrast Compression reduces patient dose and increases contrast.
What is the primary source of scatter radiation The patient.
How does scatter affect the radiographic image It impairs image quality by placing density on the film which is unrelated to patient anatomy.
Define the term beam-restricting device A device that controls the size and shape of the primary beam.
How does restricting the X ray beam decrease the amount of scatter reaching the film As the beam is restricted, fewer primary photons are emitted from the tube and collimator and fewer photons are created. (This also results in less patient dose.)
What are the three basic types of beam-restricting devices Aperture diaphragms, cones/cylinders, and collimators.
Which type of beam-restricting device is the simplest Aperture diaphragm (it is the simplest in design and application.)
What is the principle disadvantage of the aperture diaphragm Increase in image blur
What are three applications for aperture diaphragms X ray head units, dedicated chest radiography, and dental units.
What are the two major types of cones used in radiography Cylinder and flared
What are the disadvantages of using cones/cylinders Difficulty in alignment and fixed field size
What are some applications of cones/cylinders in radiography Skull, spine and dental radiography, cholecystography, mammography
Which of the three types of beam restrictors is best Collimators
What are two advantages of collimators over other types of beam-restrictors X ray field is illuminated and it can be adjusted to infinite sizes.
What are positive beam-limiting collimators (PBL) Automatic collimators that sense the size of the image receptor and adjust the collimating shutters to that size (Positive Beam Limitation was required until 1994)
Created by: hseratt
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