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X-Ray & Matter 147
Part 1
| Question | Answer |
|---|---|
| Photons pass through the patient without interacting at all | Transmission |
| Reduction in number of x-rays due to partial or complete absorption | Attenuation |
| Complete transfer of all photon energy to the atom | Complete Absorption |
| Secondary radiation traveling in a new direction, with the same or less energy than before | Scatter |
| _________ is the x-ray beam before it comes into contact with something else | Primary Radiation |
| Small Angle Scatter and Transmitted radiation that hits the IR | Remnant Radiation |
| _______ x-ray photons interact w/ the whole atom | Low-Energy |
| Low Energy X-Ray Photons are of _______ in diagnostic x-ray | Little Concern |
| _______ interact w/ the orbital electrons or nuclear field | Mid-Energy X-Ray photons |
| Mid-Energy X-Ray photons are used when performing ______ | Diagnostic X-Rays |
| ________ interact w/ the nucleus | High-Energy X-Ray photons |
| High-Energy X-Ray Photons _________ in Diagnostic X-Ray | Are not used |
| Classical scattering or Thompson scattering is also known as____ | Coherent Scattering |
| Coherent Scattering- | Incident photon causes electron excitation • Excited electron re-emits the photon in a new direction • Scatter photon has same wavelength and energy as the initial photon |
| Coherent Scattering is usually absorbed by the body and contributes slightly to ________ | Patient Dose & Image Noise IF it reaches the IR |
| Photodisintegration- | Incident photon absorbed directly into nucleus, a Nuclear Particle is Ejected (Usually a Neutron) |
| Nuclear Excitation causes ______ during Photodisintegration | Nucleon Particle Emission |
| Pair Production- | Incident photon interacts with nuclear field • Incident x-ray disappears • Photon transformed into 2 electrons • Negative and positive electron |
| Compton Scattering- | An Incident mid-energy photon ejects an outer shell electron |
| ________ Has the most energy and Scatters at 180 degrees | Backscatter Radiation |
| Compton Scatter Reduces _______ | Image Contrast |
| Compton Scatter is the Primary Source of_________ | Occupational Exposure |
| More______, More Scatter | Matter |
| Compton Probability depends on __________ | kVp (Photon Energy) |
| Photoelectric Effect- | An Incident mid-energy x-rays ejects an inner shell electron |
| The Photoelectric Effect is the Primary source of_______ | Patient Exposure |
| The X-Ray is _______ during the Photoelectric Effect | Totally Absorbed |
| _______ = 50% photoelectric effect | 50 kVp |
| _______ = 25% photoelectric effect | 120 kVp |
| Higher atomic number, patient thickness (density), and atomic number results in _______ Photoelectric Effect | Increased |
| The Incident x-ray must have ______ than the electron binding energy to eject the Photoelectron | Equal or Greater |
| The atom is ionized and a Secondary Characteristic Cascade occurs as a result of the_______ | Photoelectric Effect |
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