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Dental Radiology | 97 Study Questions and Answers 100% Correct | Updated
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Dental Radiology | 97 Study Questions andAnswers 100% Correct | Updated 2024-2025
Who discovered x-rays? - ANSWER Wilhelm Conrad Roentgen
Who are the pioneers in Dental Radiography? - ANSWER Wilhelm Conrad
Roentgen, Otto Walkhoff, C. Edmund Kells
What is matter? - ANSWER Anything that occupies space and has form or
shape
An atom consists of what two parts? - ANSWER A atom consists of two parts: a
central nucleus and orbiting electrons
Define the nucleus and electrons - ANSWER Nucleus - The dense core of an
atom, made up of protons and neutrons. (Protons are positively charged and
neutrons have no charge, the nucleus therefore has a positive charge)
Electrons - Tiny, negatively charged particles that travel around the nucleus.
What is a proton? - ANSWER A tiny bundle of pure energy that has no weight
or mass that travels as waves at the speed of light and moves through space in a
straight line.
What is an ion? - ANSWER An atom that has gained or lost an electron, causing
it to have a charge, and is now electrically imbalanced.
,X-rays have enough energy to produce ions because of: - ANSWER Ionization
The _____ the wavelength of the x-ray the ____ its energy - ANSWER shorter;
greater
Each component of the tubehead defined - ANSWER Housing: The housing in
the metal body that contains the x-ray tube.
Insulating oil: Insulating oil fills the housing and surrounds the x-ray tube. Oil
prevents overheating by absorbing the heat created by the production of x-rays.
Tubehead seal: The tubehead seal, made of leaded glass or aluminum, keeps the
oil in the tubehead and acts as a filter for the x-ray beam.
X-ray tube: The x-ray tube is where x-rays are produced.
Transformer: The transformer alters the voltage of incoming electrical current
Aluminum filter: Is a 0.5-mm-thick sheet located inside the PID in the path of the
x-ray beam that filters out of the non penetrating, longer-wavelength radiographs
Lead collimator: A metal disc with a mall opening in the center that is located
inside of the PID. It limits the size of the x-ray beam to a circular 2 inch opening at
the PID.
, PID: Position Indicatior Device, the open-ended lead-lined cylinder that extends
from the opening of the metal housing.
The x-ray tube is the _____ of the x-ray generating system - ANSWER heart
Define cathode and anode. - ANSWER Cathode: The negative electrode. It
consists of a tungsten filament in a focusing cup made of molybdenum. It supplies
the electrons necessary to generate x-rays.
Anode: The positive electrode. Composed of a tungsten target that is embedded
in a larger copper stem. It acts as the target for the electrons.
The PID is used for: - ANSWER Aim the x-ray beam at the film in the patients
mouth
List and define the components of the control panel. - ANSWER Master switch:
used to turn the machine on and off.
Indicator light: the orange light shows when the master switch is on. The red light
comes on when the exposure button is being pushed and x-rays are being emitted.
Explain how x-rays are produced in the x-ray machine. - ANSWER The electrical
current enters the control panel and travels from the control panel to the
tubehead through electrical wires in the extension arm.
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