LRA 211: 3.4 ACTIVITY (CHAPTER 8 KEY
TERMS) QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT!!!
1. Absorption
Answer: ✔✔ The process where some x-ray photons are completely
absorbed as their energy is deposited within the atoms composing the
tissue.
Explanation:
Absorption occurs when x-ray photons lose all their energy as they interact
with the atoms in the body. This energy is transferred to the tissue, resulting
in the photon being completely absorbed. Photoelectric effect is a common
mechanism of absorption, where an x-ray photon transfers all its energy to
an inner-shell electron, ejecting the electron from the atom and creating an
ionized atom.
2. Attenuation
Answer: ✔✔ The reduction in energy or number of photons in the
primary x-ray beam as it passes through anatomic tissue, occurring
because of photon interactions with the atomic structures composing the
tissues.
Explanation:
Attenuation refers to the decrease in x-ray beam intensity as it passes
through the body. This reduction occurs due to two main processes:
o Absorption: The x-ray photons are completely absorbed by the tissue.
o Scattering: Some photons are scattered in different directions.
The degree of attenuation depends on the density and atomic
composition of the tissues the beam passes through.
3. Coherent Scattering
, Answer: ✔✔ An interaction occurring with low-energy x-rays, where
the incoming photon interacts with the atom, causing it to become
excited without loss of energy but changing direction.
Explanation:
Coherent scattering (also known as Classical or Rayleigh scattering)
occurs with low-energy x-rays. In this interaction, the x-ray photon is
absorbed by the atom, causing the atom to become momentarily excited. The
photon then re-emits with the same energy but in a different direction.
There is no energy loss during this process, but the photon is scattered,
which can contribute to image degradation.
4. Contrast Resolution
Answer: ✔✔ The ability of a digital imaging system to display a range
of brightness levels (shades of gray) that structurally represent the
anatomic area of interest.
Explanation:
Contrast resolution refers to the ability of an imaging system (like digital
radiography) to differentiate between various shades of gray. This is
important for distinguishing subtle differences in tissue densities, such as
between soft tissue and organs. Higher contrast resolution allows the
system to detect more subtle differences and is crucial for clear and detailed
images of anatomical structures.
5. Differential Absorption
Answer: ✔✔ The process that underlies image formation, based on the
difference between the x-ray photons absorbed photoelectrically and
those that penetrate the body, creating an image that structurally
represents the anatomic area of interest.
Explanation:
Differential absorption occurs because different tissues in the body absorb
x-rays at different rates. Dense tissues like bone absorb more x-rays (via
photoelectric effect) and appear white or light on the image, while less
TERMS) QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS 100%
CORRECT!!!
1. Absorption
Answer: ✔✔ The process where some x-ray photons are completely
absorbed as their energy is deposited within the atoms composing the
tissue.
Explanation:
Absorption occurs when x-ray photons lose all their energy as they interact
with the atoms in the body. This energy is transferred to the tissue, resulting
in the photon being completely absorbed. Photoelectric effect is a common
mechanism of absorption, where an x-ray photon transfers all its energy to
an inner-shell electron, ejecting the electron from the atom and creating an
ionized atom.
2. Attenuation
Answer: ✔✔ The reduction in energy or number of photons in the
primary x-ray beam as it passes through anatomic tissue, occurring
because of photon interactions with the atomic structures composing the
tissues.
Explanation:
Attenuation refers to the decrease in x-ray beam intensity as it passes
through the body. This reduction occurs due to two main processes:
o Absorption: The x-ray photons are completely absorbed by the tissue.
o Scattering: Some photons are scattered in different directions.
The degree of attenuation depends on the density and atomic
composition of the tissues the beam passes through.
3. Coherent Scattering
, Answer: ✔✔ An interaction occurring with low-energy x-rays, where
the incoming photon interacts with the atom, causing it to become
excited without loss of energy but changing direction.
Explanation:
Coherent scattering (also known as Classical or Rayleigh scattering)
occurs with low-energy x-rays. In this interaction, the x-ray photon is
absorbed by the atom, causing the atom to become momentarily excited. The
photon then re-emits with the same energy but in a different direction.
There is no energy loss during this process, but the photon is scattered,
which can contribute to image degradation.
4. Contrast Resolution
Answer: ✔✔ The ability of a digital imaging system to display a range
of brightness levels (shades of gray) that structurally represent the
anatomic area of interest.
Explanation:
Contrast resolution refers to the ability of an imaging system (like digital
radiography) to differentiate between various shades of gray. This is
important for distinguishing subtle differences in tissue densities, such as
between soft tissue and organs. Higher contrast resolution allows the
system to detect more subtle differences and is crucial for clear and detailed
images of anatomical structures.
5. Differential Absorption
Answer: ✔✔ The process that underlies image formation, based on the
difference between the x-ray photons absorbed photoelectrically and
those that penetrate the body, creating an image that structurally
represents the anatomic area of interest.
Explanation:
Differential absorption occurs because different tissues in the body absorb
x-rays at different rates. Dense tissues like bone absorb more x-rays (via
photoelectric effect) and appear white or light on the image, while less
