Radiography Essentials Ch 7
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28 terms
Terms | Definitions |
|---|---|
 Contrast | A film characteristic that can be determined by the slope of the sensitometric curve |
| Polyester plastic | Material used to make radiographic film base |
| Wire mesh tool | Used to test film/screen contact |
| Phosphor layer | Part of an intensifying screen that absorbs x-ray energy and emits this energy in the form of light |
| Components of radiographic film emulsion | Gelatin, silver halide microcrystals, sulfar contaminate |
| Form sensitivity specks | The purpose of the sulfar contaminate in radiographic film emulsion |
| Backscatter | Radiation that comes from the cassette back and the cassette tray, and is directed toward the film |
| Purpose of intensifying screens | Reduces amount of exposure required to produce an image |
| Screens with the smaller phosphor crystals will... | Produce a radiographic image with more recorded detail |
| Optical density (OD) | A numerical representation of the film's ability to transmit light |
| Reflective layer | Part of the intensifying screen which functions to increase screen efficiency |
| Stand on edge | The proper method to store unopened boxes of x-ray film |
| Reduces eye strain for the physician | The purpose of the tint that is added to radiographic film base |
| Quarterly | Frequency that a film/screen contact test should be performed |
| Spectral sensitivity | The portion of the electromagnetic spectrum to which a film is most sensitive |
| Spectral emission | The color of light emitted by the screen phosphor |
| Intensifying screen | The portion of the image receptor (IR) system which functions to reduce the amount of exposure required to produce an image |
| The reflector layer of an intensifying screen | The part between the base and the phosphors that reflects light back toward the film |
| Image blur | Caused by poor film/screen contact |
| A film with a steep, vertical curve indicates... | The film has high contrast |
| An intensifying screen | The inside, smooth surface of a cassette that contains fluorescent phosphors |
| Screen speed | The efficiency of a screen in converting x-rays to light |
| Prevents backscatter from fogging image | The purpose of the lead foil layer in the back part of the cassette |
| Never poor liquid cleaner onto the screen | Important rule when cleaning intensifying screens |
| The shoulder portion of a sensitometric curve indicates... | The maximum radiographic density produced by a film |
| The characteristic curve of a film with wide latitude and longer scale contrast | A more horizontal and wide curve |
| Salts of rare earth elements | Commonly used phosphors for intensifying screens |
| A cool, dry place protected from x-rays and chemical fumes | Optimum storage conditions for unused x-ray film |
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