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Principles of Radiographic Imaging
Questions and Correct Answers/ Latest
Update / Already Graded
What is the definition of radiography?
Ans: Radiography is the process of creating static images using
ionizing radiation, where 'radio-' refers to radiation and
'graphy-' means to write or create a record of.
How does fluoroscopy differ from radiography?
Ans: Fluoroscopy is a dynamic x-ray imaging technique that
provides live action images, in contrast to radiography which
produces static images.
What are the characteristics of radiolucent materials?
Ans: Radiolucent materials are those with a lower Z -number,
which means they absorb very little x-ray energy. As a result,
they appear darker on x-ray images.
What defines radiopaque materials and how do they appear on x-ray
images?
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Ans: Radiopaque materials have a higher Z-number, allowing
them to absorb a large amount of the x-ray beam's energy.
Consequently, they appear lighter or whiter on x -ray images.
What are the three main processes involved in the formation of an X-
ray image?
Ans: The three main processes involved in the formation of an
X-ray image are: 1) Source of electrons, where electrons are
generated; 2) Rapid acceleration of electrons, where these
electrons are accelerated towards the target; and 3) Rapid
deceleration of electrons, which occurs when the electrons hit
the target and produce X-rays that form the image.
What are the three interactions that occur when a beam interacts with
an object?
Ans: When a beam interacts with an object, three key
interactions occur: **scatter**, where some of the radiation is
deflected to the side; **absorption**, where some of the
radiation is absorbed by the object; and **transmission**,
where some radiation passes through the object to reach the
image receptor.
What is differential absorption in the context of X-ray imaging?
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Ans: Differential absorption refers to the process where some
X-ray energy is absorbed as it passes through an object, such as
human tissue. The amount of absorption varies based on the
density of the tissue, leading to a remnant beam that contains a
range of different energies. This variation in absorption is
crucial for image formation in X-ray imaging, as it allows for the
differentiation between various types of tissues, such as soft
tissue and bone.
What is the role of the anode in an x-ray tube?
Ans: The anode serves as the site of x-ray production within
the x-ray tube, where electrons from the cathode collide and
generate x-rays.
What is the primary or useful beam in X-ray imaging?
Ans: The primary or useful beam consists of X-ray photons that
originate on the anode surface and diverge as they travel from
the source.
What is the Central Ray (CR) in radiography?
Ans: The Central Ray (CR) is the exact center of the p rimary
beam used to align the patient, image receptor (IR), and beam.
At the CR, the photons are perpendicular and not diverging,
All rights reserved © 2025/ 2026 |
Principles of Radiographic Imaging
Questions and Correct Answers/ Latest
Update / Already Graded
What is the definition of radiography?
Ans: Radiography is the process of creating static images using
ionizing radiation, where 'radio-' refers to radiation and
'graphy-' means to write or create a record of.
How does fluoroscopy differ from radiography?
Ans: Fluoroscopy is a dynamic x-ray imaging technique that
provides live action images, in contrast to radiography which
produces static images.
What are the characteristics of radiolucent materials?
Ans: Radiolucent materials are those with a lower Z -number,
which means they absorb very little x-ray energy. As a result,
they appear darker on x-ray images.
What defines radiopaque materials and how do they appear on x-ray
images?
All rights reserved © 2025/ 2026 |
, Page |2
Ans: Radiopaque materials have a higher Z-number, allowing
them to absorb a large amount of the x-ray beam's energy.
Consequently, they appear lighter or whiter on x -ray images.
What are the three main processes involved in the formation of an X-
ray image?
Ans: The three main processes involved in the formation of an
X-ray image are: 1) Source of electrons, where electrons are
generated; 2) Rapid acceleration of electrons, where these
electrons are accelerated towards the target; and 3) Rapid
deceleration of electrons, which occurs when the electrons hit
the target and produce X-rays that form the image.
What are the three interactions that occur when a beam interacts with
an object?
Ans: When a beam interacts with an object, three key
interactions occur: **scatter**, where some of the radiation is
deflected to the side; **absorption**, where some of the
radiation is absorbed by the object; and **transmission**,
where some radiation passes through the object to reach the
image receptor.
What is differential absorption in the context of X-ray imaging?
All rights reserved © 2025/ 2026 |
, Page |3
Ans: Differential absorption refers to the process where some
X-ray energy is absorbed as it passes through an object, such as
human tissue. The amount of absorption varies based on the
density of the tissue, leading to a remnant beam that contains a
range of different energies. This variation in absorption is
crucial for image formation in X-ray imaging, as it allows for the
differentiation between various types of tissues, such as soft
tissue and bone.
What is the role of the anode in an x-ray tube?
Ans: The anode serves as the site of x-ray production within
the x-ray tube, where electrons from the cathode collide and
generate x-rays.
What is the primary or useful beam in X-ray imaging?
Ans: The primary or useful beam consists of X-ray photons that
originate on the anode surface and diverge as they travel from
the source.
What is the Central Ray (CR) in radiography?
Ans: The Central Ray (CR) is the exact center of the p rimary
beam used to align the patient, image receptor (IR), and beam.
At the CR, the photons are perpendicular and not diverging,
All rights reserved © 2025/ 2026 |
