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scatter radiation
caseys summer class
| Question | Answer |
|---|---|
| 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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