Radiology glossary quiz

The direction or angle at which the central ray and PID of the xray machine are aimed at the teeth and film

Front teeth of either jaw (incisor and canine teeth)

The point or extremity of the tooth root (pl., apices)

A radiographic view that shows the crowns of the upper and lower posterior teeth and the alveolar bone crest of the maxilla and mandible

Surface of the tooth towards the cheek

The middle of the primary beam (=central beam)

A device that helps eliminate peripheral radiation

An error in PID placement that results in part of the film being unexposed

The difference in density between adjacent (radiolucent and radiopaque) areas of an image

The degree of blackness of an image

Surface of the tooth towards the back of the mouth, away from the midline

An error in vertical angulation resulting in an image that appears to be too long

= identification dot; a circle on the corner of the xray film packet that corresponds to a raised area on one side of the film. It is used to determine which side of the film was struck by the xray.

The amount of time the xray beam is released during the taking of one radiograph

A radiographic technique in which the film is placed outside of the mouth during exposure

An error in angulation resulting in an image of reduced height

The direction of the xray beam in the horizontal plane (ie. parallel with the floor)

The cutting edge of the anterior teeth

A radiographic technique in which the film is placed inside the mouth during exposure

1000 volts; the unit of measure for the penetrating power of the xray beam

Surface of the tooth towards the lips

Surface of the tooth towards the tongue

Cylinder (PID) on xray machines where anode-film distance is 12 to 20 inches

lower jaw

upper jaw

Surface of the tooth towards the front; closest to the midline

= Midline; an imaginary vertical line or plane passing through the center of the body that divides it into right and left havles

1/1000 of an ampere, the unit of measure of quantity of radiation

Surface of a premolar or molar that meets the opposing teeth in the closure of jaw (ie. biting surface)

superimposition of the image of one tooth over part of another, produced when the central ray is not perpendicular to the film and teeth in the horizontal plane

Around the apex of the tooth (used to refer to radiographs that show the crown, root, and supporting structures of the tooth)

= Position Indicating Device; any device attached to the tubehead at the aperture to direct the useful beam of radiation; long or short, cylindrical or rectangular, open or closed (pointed) at tip

Teeth of either jaw behind the incisors and canines. ie. premolars and molars

the main flow of xrays from the xray machine

structures that are permeable to xrays, producing black areas on radiographs

structures that absorb xrays, produce light areas on radiographs

Xrays deflected from exposed tissue to adjacent tissue, or xrays deflected within the tubehead; weaker than primary radiation

Cylinder (PID) on dental xray machines where anode-film distance is 9 inches or less

Angle made between the xray beam and a line parallel to the floor

A high energy electromagnetic wave that can penetrate solid matter

Extension cone paralleling instrument (made by RINN)

Long cone technique = right angle technique = paralleling technique. This technique consists of placing the film packet parallel to the longitudinal axis of the tooth and directing the central ray perpendicular to tooth and film packet