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Radiology Terms
QUIZ DAY 5
| Term | Definition |
|---|---|
| ALARA | "As Low As Reasonably Achievable" minimizing exposure while still accomplishing necessary tasks. |
| Cathode | The negative electrode in the x-ray tube. |
| Density | The overall degree of blackness or darkness of a radiographic image. |
| Focusing cup | A negatively charged part of the cathode that directs the electrons toward the tungsten target on the anode. |
| Kilovoltage kVp | Controls the speed and energy of the electrons traveling from the cathode to the anode. It affects the penetrating power and contrast of the x-ray beam. |
| Latent period/image | The invisible image that exists on the image receptor immediately after x-ray exposure but before the image is processed/displayed. |
| Milliamperage | Controls the number of electrons produced by the x-ray tube and therefore the quantity/intensity of x-rays produced. |
| Primary radiation | The useful x-ray beam that comes directly from the x-ray tube toward the patient and image receptor. |
| Radiolucent | Radiation that is deflected from its original path after interacting with matter, such as the patient's tissues. Example: Soft and Pupal Tissue |
| Scatter radiation | Radiation that is deflected from its original path after interacting with matter, such as the patient's tissues. |
| Secondary radiation | Radiation produced when the primary x-ray beam interacts with matter. Scatter radiation is the most important type of secondary radiation in dental radiography. |
| X-ray | A form of electromagnetic radiation with enough energy to penetrate matter and produce images of internal structures. |
| Bisecting technique | An intraoral radiographic technique where the receptor is placed close to the tooth and the central ray is directed perpendicular to an imaginary angle bisecting the angle between the tooth and receptor. |
| Cone-cutting | A radiographic error caused when the x-ray beam does not completely cover the image receptor, leaving an unexposed/clear area on the image. |
| Elongation | A radiographic error in which the image of the tooth appears too short. Usually caused by excessive vertical angulation. |
| Foreshortening | A radiographic error in which the image of the tooth appears too short. Usually caused by excessive vertical angulation. |
| Radiopaque | A structure or material that absorbs or blocks x-rays, appearing white or light on a radiograph. Example: Enamel and Dentin |
| Cephalometeric radiograph | An extraoral x-ray image of the head and facial structures, commonly used in orthodontics to evaluate the relationship and growth of the teeth, jaws, and skull. |
| Digital image | An image created when x-rays are captured by a digital image receptor and converted into electronic/digital data that can be viewed on a computer. |