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Radiography
Ch 6 Dental X-ray Image Characteristics
| Question | Answer |
|---|---|
| Which type of dental filling material would appear the most radiopaque on a dental image? | Amalgam |
| What is the term for the overall blackness or darkness of an image? | Density |
| What portion of the tooth is the most radiopaque? | The enamel |
| Radiolucent refers to that portion of a dental image that is | Black |
| If the milliamperage is increased, the receptor density ________, and the image appears _________. | Increases; darker |
| If the operating kilovoltage is increased, the receptor density ____ because the average energy of the x-rays is raised. | Increases |
| What could you change to produce an image with increased density if the initial image is too light and undiagnostic? | Increase the exposure time |
| How would you describe an image that appears very radiopaque while the periodontium and tissue appear very radiolucent? | High contrast. |
| How would you define an image that is said to have high contrast? | An image that has very dark areas and very light areas |
| A film with increased contrast could be caused by what? | An increase in development temperature |
| What is the definition of the range of useful densities seen on a dental image? | Scale of contrast. |
| A stepwedge will reveal that images taken at a lower kV will have __________ than images taken at a higher kV. | Higher contrast |
| What is the typical stepwedge constructed of? | Aluminum. |
| A stepwedge will reveal that images taken at a higher kV will have _____________ versus images taken at a lower kV. | Long-scale contrast |
| The geometric characteristic of _____________ refers to an image that appears larger than the actual size of the object it represents. | Magnification |
| Which influencing factors would degrade sharpness? | Larger silver halide crystal size and larger focal spot |
| The primary factor that limits the size of the tungsten target is | Heat production. |
| Which of the following factors would improve image sharpness? | Smaller crystal size in the film |
| What will you need to do to decrease image magnification when using the paralleling technique for images where the receptor is placed approximately an inch from the teeth ? | Increase target-receptor distance. |
| What will a longer position-indicating device (PID) result in? | An increased target-receptor distance. |
| To minimize dimensional distortion, the object and receptor must be _____________ one another. | Parallel to |
| What would you minimize by directing the position indicating device (PID) perpendicular to the tooth and the receptor when taking images? | Dimensional distortion |
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BrendaAlberts