Radiology Lesson 1 Terms To Know Flashcards
Frankfort Plane
The imaginary plane that intersects the orbital rim of the eye and the opening of the ear
Ghost Image
An artifact on a dental radiograph produced when an area of high density (earrings) is penetrated twice by the X-ray beam; appears radiopaque
Half-value Layer (HVL)
The thickness of material that, when placed in he path of the x-ray beam, reduces the exposure rate by one-half
Insulating Oil
Oil that surrounds the X-ray tube and transformers inside the tubehead
Leaded-glass Housing
The leaded-glass housing of the X-ray tube
Metal Housing
The metal body of the dental X-ray tubehead that surrounds the X-ray tube and transformers
Penumbra
The unsharpness, or blurring, that surrounds the edges of a radiographic image
Attenuation
This is a reduction in the number of X-ray photons in the X-ray beam
Phalangioma
An error on a dental radiograph that results from the patients finger being placed in front of the film
Polychromatic X-ray beam
An X-ray beam containing many different wavelengths of varying intensities
Quanta
A bundle of energy with no mass or weight; a photon
Reference radiograph
A radiograph processed under ideal conditions and then used to compare the film densities of radiographs that are processed daily, a step wedge creates a reference radiograph
Reduction
A chemical reaction during film processing in which the halide portion of the exposed energized silver halide crystals is removed. The latent image becomes visible
Rotation center
In panoramic radiography, the axis on which the film and X-ray tube head rotate around the patient
Adumbration
The formation of a fuzzy shadow around the outline of the image on the radiograph
