LRA 211 FINAL EXAM STUDY GUIDE
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT!!!
1. What occurs during the anode heel effect?
Answer: ✔✔ The image becomes darker on the anode side
Explanation:
The anode heel effect is a phenomenon where the x-ray beam is less intense
on the anode side of the x-ray field than on the cathode side. This is due to
the geometry of the x-ray tube and the angle of the anode. The anode side is
farther from the image receptor, and x-ray photons have to pass through
more of the anode target material, which absorbs some of the radiation. As a
result, the image appears darker on the cathode side (where there are more
photons) and lighter on the anode side.
2. What is the function of the anode in an x-ray tube?
Answer: ✔✔ To interact with electrons to produce x-rays
Explanation:
The anode is the positive electrode in the x-ray tube. It serves two main
purposes:
o It interacts with the electrons from the cathode to produce x-rays
through Bremsstrahlung and characteristic interactions.
o It also helps to dissipate the heat generated by the high-energy
electrons striking the target.
3. What is the electrical charge of a proton?
Answer: ✔✔ Positive
Explanation:
A proton is a subatomic particle with a positive charge. It is found in the
, nucleus of an atom and has a mass similar to that of a neutron but much
greater than that of an electron.
4. X-rays and gamma rays can ionize matter, which makes them useful tools
without any risks.
Answer: ✔✔ False
Explanation:
X-rays and gamma rays are forms of ionizing radiation, meaning they
have enough energy to remove electrons from atoms, thus ionizing them.
This ability to ionize matter is what makes them useful for imaging and
cancer treatment, but it also comes with risks. Overexposure to ionizing
radiation can damage living tissues, leading to biological effects like cell
death, mutations, or cancer.
5. How does the rotating anode help manage heat?
Answer: ✔✔ By spreading heat over a larger surface area
Explanation:
The rotating anode in the x-ray tube helps to distribute the heat produced
during x-ray production over a larger surface area. As the anode rotates,
the electrons strike different areas of the target, preventing localized
overheating. This is crucial for maintaining the efficiency and longevity of
the x-ray tube, as the process of x-ray production generates a significant
amount of heat.
6. The closer the electron is to the nucleus, the stronger is its binding energy.
Answer: ✔✔ True
Explanation:
The binding energy of an electron refers to the amount of energy required
to remove it from its orbit around the nucleus. Electrons that are closer to the
nucleus experience a stronger attractive force from the positively charged
protons, which results in a stronger binding energy. Conversely, electrons
, in higher energy levels (further from the nucleus) have weaker binding
energies because the attractive force from the nucleus is weaker at greater
distances.
How does digital technology improve the anode heel effect in x-ray imaging
By having a wide dynamic range that detects and displays various x-ray intensities.
what cooling mechanisms are included in the design of the x-ray tube housing
Oil bath and cooling fans
what is the charge of the focusing cup in the x-ray tube
negative
The focusing cup forces the electrons together into a cloud through electrostatic
repulsion
true
frequency is generally expressed in
Hertz (Hz)
the anode of the x-ray tube is the negative end and the cathode is the positive end
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100%
CORRECT!!!
1. What occurs during the anode heel effect?
Answer: ✔✔ The image becomes darker on the anode side
Explanation:
The anode heel effect is a phenomenon where the x-ray beam is less intense
on the anode side of the x-ray field than on the cathode side. This is due to
the geometry of the x-ray tube and the angle of the anode. The anode side is
farther from the image receptor, and x-ray photons have to pass through
more of the anode target material, which absorbs some of the radiation. As a
result, the image appears darker on the cathode side (where there are more
photons) and lighter on the anode side.
2. What is the function of the anode in an x-ray tube?
Answer: ✔✔ To interact with electrons to produce x-rays
Explanation:
The anode is the positive electrode in the x-ray tube. It serves two main
purposes:
o It interacts with the electrons from the cathode to produce x-rays
through Bremsstrahlung and characteristic interactions.
o It also helps to dissipate the heat generated by the high-energy
electrons striking the target.
3. What is the electrical charge of a proton?
Answer: ✔✔ Positive
Explanation:
A proton is a subatomic particle with a positive charge. It is found in the
, nucleus of an atom and has a mass similar to that of a neutron but much
greater than that of an electron.
4. X-rays and gamma rays can ionize matter, which makes them useful tools
without any risks.
Answer: ✔✔ False
Explanation:
X-rays and gamma rays are forms of ionizing radiation, meaning they
have enough energy to remove electrons from atoms, thus ionizing them.
This ability to ionize matter is what makes them useful for imaging and
cancer treatment, but it also comes with risks. Overexposure to ionizing
radiation can damage living tissues, leading to biological effects like cell
death, mutations, or cancer.
5. How does the rotating anode help manage heat?
Answer: ✔✔ By spreading heat over a larger surface area
Explanation:
The rotating anode in the x-ray tube helps to distribute the heat produced
during x-ray production over a larger surface area. As the anode rotates,
the electrons strike different areas of the target, preventing localized
overheating. This is crucial for maintaining the efficiency and longevity of
the x-ray tube, as the process of x-ray production generates a significant
amount of heat.
6. The closer the electron is to the nucleus, the stronger is its binding energy.
Answer: ✔✔ True
Explanation:
The binding energy of an electron refers to the amount of energy required
to remove it from its orbit around the nucleus. Electrons that are closer to the
nucleus experience a stronger attractive force from the positively charged
protons, which results in a stronger binding energy. Conversely, electrons
, in higher energy levels (further from the nucleus) have weaker binding
energies because the attractive force from the nucleus is weaker at greater
distances.
How does digital technology improve the anode heel effect in x-ray imaging
By having a wide dynamic range that detects and displays various x-ray intensities.
what cooling mechanisms are included in the design of the x-ray tube housing
Oil bath and cooling fans
what is the charge of the focusing cup in the x-ray tube
negative
The focusing cup forces the electrons together into a cloud through electrostatic
repulsion
true
frequency is generally expressed in
Hertz (Hz)
the anode of the x-ray tube is the negative end and the cathode is the positive end
