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X-Ray & Matter 147
Part 2
| Question | Answer |
|---|---|
| ______ is the The difference between x-rays that do reach the image receptor and x-rays that do not reach the image receptor | Differential Absorption |
| Differential Absorption is the Basis for ______ of an image | Contrast |
| X-Rays ______ DO NOT reach the IR | Absorbed by Photoelectric Interactions |
| X-Rays _______ DO reach the IR | Transmitted Without Interactions |
| Less than ______ of x-rays reaching the IR form the image | ½ of the 1% |
| __________= Less x-ray transmission (more photoelectric interactions) | Higher Atomic Number |
| ________ = More transmission through tissue (Fewer photoelectric interactions) | Increases in X-Ray Energy |
| ________ = Proportional reduction in x-ray transmission (increase in Compton interactions and photoelectric interactions) | Increased Mass Density |
| Attenuation is a _______ in the total number of x-rays photons remaining as the beam passes through matter | Reduction |
| _______ = Attenuation | X-rays Absorption + X-ray Scatter |
| X-rays are attenuated _______ | Exponentially |
| The ________ Creates the “white” in the image | Photoelectric Effect |
| ______ is used in Radiation Therapy | Photodisintegration |
| Compton Interactions are more likely to occur with a ______ | Higher kVp |
| The Photoelectric Effect is more likely to occur with a ______ | Lower kVp |
| In Pair Production, the ________ Will have future interactions, ending up as part of another atom | Negatron |
| The unnatural ______ will cause an "annihilation event” with another electron, destroying both particles and creating two x-ray photons destroying both particles creating two annihilation gamma-ray photons | Positron |
| _______ Reduces image contrast | Compton Scatter |
| _______ is used in Positron Emission Tomography | Pair Production |
| Photodisintegration & Pair Production have an _______ – NOT an X-ray | Incident Photon |
| What is the end result of the annihilation event that occurs during pair production | Two annihilation gamma-ray photons |
| Absorbed X-Ray- | Completely removed from beam, ceases to exist |
| Scattered X-Ray- | Contains no useful information and is a source of noise in the image |
| Pair Production Positron and Negatron Energy | 0.51 MeV |
| Photodisintegration Energy | Above 10 MeV |
| Pair Production Energy | 1.02 MeV |
| Coherent Scattering Energy | 10 keV or less |
| The Photoelectric Effect is when an Incident X-Ray ejects an ___________ | Inner-Shell Electron |
| Compton Scatter occurs when an Incident X-Ray ejects an ___________ | Outer-Shell Electron |
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