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Questions and Answers
What is the process that occurs when a photon with energy exceeding 1.02 MeV interacts with the electric field of the nucleus?
What is the process that occurs when a photon with energy exceeding 1.02 MeV interacts with the electric field of the nucleus?
- Photon is totally absorbed and excites the nucleus
- Photon interacts with the nucleus, exciting it and causing it to emit a nuclear fragment (correct)
- Photon undergoes differential absorption, leading to differences in optical densities on the image
- Photon energy is split into an electron-positron pair
What happens when a high energy photon interacts with the nucleus at energies above 10 MeV?
What happens when a high energy photon interacts with the nucleus at energies above 10 MeV?
- Photon undergoes photodisintegration, causing the nucleus to emit a nucleon or other nuclear fragments (correct)
- Photon energy is split into an electron-positron pair
- Photon interacts with the nucleus, exciting it and causing it to emit a nuclear fragment
- Photon is totally absorbed and excites the nucleus
How does the difference in optical densities on the image, leading to different shades of grey, occur?
How does the difference in optical densities on the image, leading to different shades of grey, occur?
- Photon is totally absorbed and excites the nucleus
- Photon interacts with the nucleus, exciting it and causing it to emit a nuclear fragment
- Photon energy is split into an electron-positron pair
- Photon undergoes differential absorption, causing differences in optical densities on the image (correct)
What is the process in which electrons are boiled off at the cathode?
What is the process in which electrons are boiled off at the cathode?
What is the typical size of the bombarded spot on the anode?
What is the typical size of the bombarded spot on the anode?
What does EFS stand for in the context of x-ray tubes?
What does EFS stand for in the context of x-ray tubes?
What causes the effective focal spot length to be smaller than the actual focal spot length?
What causes the effective focal spot length to be smaller than the actual focal spot length?
What is the function of the induction motor of the anode?
What is the function of the induction motor of the anode?
What are the main technical factors mentioned in Lecture 4?
What are the main technical factors mentioned in Lecture 4?
What does the mA setting control in an x-ray tube?
What does the mA setting control in an x-ray tube?
What is the conventional unit for quantity of electrical charge liberated by ionizing electromagnetic energy per unit mass of air?
What is the conventional unit for quantity of electrical charge liberated by ionizing electromagnetic energy per unit mass of air?
What is the goal of the AEC (Automatic Exposure Control) in an x-ray system?
What is the goal of the AEC (Automatic Exposure Control) in an x-ray system?
What does the kVp setting control in an x-ray tube?
What does the kVp setting control in an x-ray tube?
What is the process in which changing magnetic field in stator coils induces current and magnetic fields in the rotor of the induction motor?
What is the process in which changing magnetic field in stator coils induces current and magnetic fields in the rotor of the induction motor?
What is the average energy of the beam controlled by?
What is the average energy of the beam controlled by?
What material is the x-ray tube envelop typically made of?
What material is the x-ray tube envelop typically made of?
What is the filament made of in the x-ray tube?
What is the filament made of in the x-ray tube?
What is the purpose of the focusing cup in the x-ray tube?
What is the purpose of the focusing cup in the x-ray tube?
What is the typical material of the target in the x-ray tube?
What is the typical material of the target in the x-ray tube?
What is the material of the stationary anode in the x-ray tube?
What is the material of the stationary anode in the x-ray tube?
What is the purpose of the rotating anode disc in the x-ray tube?
What is the purpose of the rotating anode disc in the x-ray tube?
What material connects the anode disk to the rotor assembly in rotating designs?
What material connects the anode disk to the rotor assembly in rotating designs?
What is the material of the rotor in the x-ray tube?
What is the material of the rotor in the x-ray tube?
What powers the induction motor outside the tube around the rotor?
What powers the induction motor outside the tube around the rotor?
What has limitations as only certain parts of the remnant beam are measured?
What has limitations as only certain parts of the remnant beam are measured?
What does the emission spectrum graph plot?
What does the emission spectrum graph plot?
What affects contrast in x-ray images?
What affects contrast in x-ray images?
Study Notes
X-ray Tube Components and Operation
- The x-ray tube envelop is made of pyrex glass or metal, designed to maintain vacuum and withstand high levels of heat.
- The filament, made of thoriated tungsten, is part of the cathode, producing electrons via thermionic emission.
- The focusing cup, made of metal, shapes the electron beam and keeps the electrons together.
- The target, typically made of tungsten and rhenium, is part of the anode and is struck by the electron beam for x-ray production.
- The stationary anode, made up of tungsten in a copper block, is a simple design suitable for low volume environments.
- The rotating anode disc, made of tungsten and sometimes layered with graphite, increases heat loading ability.
- The anode stem, made of molybdenum, connects the anode disk to the rotor assembly in rotating designs.
- The rotor, made of copper and iron, rotates the anode disk and is part of the induction motor inside the tube.
- The stator, made of electromagnets, powers the induction motor outside the tube around the rotor.
- The automatic exposure control (AEC) has limitations as only certain parts of the remnant beam are measured.
- The emission spectrum is a graph plotting photon energy vs. the number of photons emitted from the x-ray tube.
- Contrast in x-ray images is affected by scatter radiation, which increases with tissue thickness and decreases with better collimation.
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Description
Test your knowledge of x-ray tube components and operation with this quiz. From the filament and focusing cup to the anode and rotor, see how well you understand the key elements and functions of x-ray tubes.
