WGU D218 Chapters 1,7,18 Exam Questions with Correct Answers Latest Update 2025-2026
Radiation - Answers A form of energy carried by waves or a stream of particles
X-radiation - Answers a high-energy radiation produced by the collision of a beam of electrons
with a metal target in an x-ray tube
X-ray - Answers A beam of energy that has the power to penetrate substances and record image
shadows on photographic film
radiology - Answers The science or study of radiation as used in medicine; a branch of medical
science that deals with the therapeutic use of x-rays, radioactive substances and other forms of
radiant energy
Radiograph - Answers an image or picture produced on a receptor (radiation-sensitive film,
phosphor plate, or digital sensor) by exposure to ionizing radiation
a two-dimensional representation of a three-dimensional object
Dental radiograph - Answers A photographic image produced on film by the passage of x-rays
through teeth and related structures
radiography - Answers The art and science of making radiographs by the exposure of a receptor
to x-rays
Dental radiography - Answers The production of radiographs of the teeth and adjacent
structures by the exposure of an image receptor to x-rays
Dental radiographer - Answers Any person who positions, exposes, and processes dental x-ray
image receptors
Image - Answers a picture or likeness of an object
Image receptor - Answers A recording medium; examples include x-ray film, phosphor plate, or
digital sensor
Imaging, dental - Answers the creation of digital, print, or film representations of anatomic
structures for the purpose of diagnosis
Otto Walkoff - Answers Exposed first dental radiograph with 25 mins of exposure in 1896
First modern dental X-ray machine company - Answers Victor X-ray corporation of Chicago
Roentgen - Answers discovered x-rays in 1895
Won first Nobel prize in physics
, Experimenting with production of cathode rays and used a vacuum tube, electrical current and
fluorescent screens
Important of dental images - Answers Detect lesions, diseases, conditions
Confirm or classify suspected disease
To localize lesions or foreign objects
To provide information during dental procedure
To evaluate growth and development
To illustrate changes secondary to caries,periodontal disease, and trauma
To document the condition of a patient ata specific point in time
To aid development of a clinical treatment plan
First intraoral xray film company - Answers Eastman kodak
3-D cone beam digital imaging introduced in - Answers 1999
Intraoral - Answers image receptor placed inside the mouth
X-rays name before - Answers Roentgen rays
Tube head - Answers contains tube that produces X-rays
Position indicating device
Cone extends from tube head maybe round or rectangular
Restrict size of xray beam
Extension arm - Answers Suspends tube head, hold wires, allows for positioning of tube head
Control panel - Answers Regulate xray beam
Common types of extraoral imaging - Answers Paraoramix and cephaometic
PID may be round or rectangular - Answers Rectangular to decrease exposure
Beam alignment device - Answers Help position PID in relationship to tooth and receptor
Collimating device - Answers A metal plate with an opening, can be used to restrict the size of
Radiation - Answers A form of energy carried by waves or a stream of particles
X-radiation - Answers a high-energy radiation produced by the collision of a beam of electrons
with a metal target in an x-ray tube
X-ray - Answers A beam of energy that has the power to penetrate substances and record image
shadows on photographic film
radiology - Answers The science or study of radiation as used in medicine; a branch of medical
science that deals with the therapeutic use of x-rays, radioactive substances and other forms of
radiant energy
Radiograph - Answers an image or picture produced on a receptor (radiation-sensitive film,
phosphor plate, or digital sensor) by exposure to ionizing radiation
a two-dimensional representation of a three-dimensional object
Dental radiograph - Answers A photographic image produced on film by the passage of x-rays
through teeth and related structures
radiography - Answers The art and science of making radiographs by the exposure of a receptor
to x-rays
Dental radiography - Answers The production of radiographs of the teeth and adjacent
structures by the exposure of an image receptor to x-rays
Dental radiographer - Answers Any person who positions, exposes, and processes dental x-ray
image receptors
Image - Answers a picture or likeness of an object
Image receptor - Answers A recording medium; examples include x-ray film, phosphor plate, or
digital sensor
Imaging, dental - Answers the creation of digital, print, or film representations of anatomic
structures for the purpose of diagnosis
Otto Walkoff - Answers Exposed first dental radiograph with 25 mins of exposure in 1896
First modern dental X-ray machine company - Answers Victor X-ray corporation of Chicago
Roentgen - Answers discovered x-rays in 1895
Won first Nobel prize in physics
, Experimenting with production of cathode rays and used a vacuum tube, electrical current and
fluorescent screens
Important of dental images - Answers Detect lesions, diseases, conditions
Confirm or classify suspected disease
To localize lesions or foreign objects
To provide information during dental procedure
To evaluate growth and development
To illustrate changes secondary to caries,periodontal disease, and trauma
To document the condition of a patient ata specific point in time
To aid development of a clinical treatment plan
First intraoral xray film company - Answers Eastman kodak
3-D cone beam digital imaging introduced in - Answers 1999
Intraoral - Answers image receptor placed inside the mouth
X-rays name before - Answers Roentgen rays
Tube head - Answers contains tube that produces X-rays
Position indicating device
Cone extends from tube head maybe round or rectangular
Restrict size of xray beam
Extension arm - Answers Suspends tube head, hold wires, allows for positioning of tube head
Control panel - Answers Regulate xray beam
Common types of extraoral imaging - Answers Paraoramix and cephaometic
PID may be round or rectangular - Answers Rectangular to decrease exposure
Beam alignment device - Answers Help position PID in relationship to tooth and receptor
Collimating device - Answers A metal plate with an opening, can be used to restrict the size of
