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Exam 3 147
| Question | Answer |
|---|---|
| Low Energy Interaction | Coherent Scattering |
| Mid Energy Interaction | Compton & Photoelectric |
| High Energy Interaction | Pair Production & Photodisintegration |
| Image is created by _____ x-rays | Attenuated & Transmitted |
| _________ Loses up to 1/3 of its energy | Compton Scatter |
| As Energy Increases, The Photoelectric Effect ______ | Decreases Greatly |
| As Energy Increases, Compton Scatter _______ | Decreases |
| As Energy Increases, Transmission ______ | Increases Greatly |
| As Energy Increases, the Compton : PE ratio | Increases |
| Characteristic X-Ray's will always have ______ | 57.4 keV (69.5-12.) |
| K Shell Energy Level | 69.5 keV |
| L Shell Energy Level | 12.1 keV |
| Incident electron slowed down by positively charged nucleus | Bremsstrahlung X-Ray |
| Incident electron has enough kinetic energy to eject a k shell electron | Characteristic X-Ray |
| Bremsstrahlung radiation forms a _______ emission spectrum | Continuous |
| Characteristic radiation forms a ______ emission spectrum | Discrete |
| Larger Angle & Longer SID= | Smaller Anode Heel Effect (less variation of intensity along the beam) |
| Smaller Angle & Shorter SID= | Larger Anode Heel Effect (more variation of intensity along the beam) |
| A smaller effective focal spot size is achieved by _______ | Decreasing the Anode Angle |
| A larger effective focal spot size is achieved by _______ | Increasing the Anode Angle |
| The variation in beam intensity is affected by angling the anode is known as the _____ | Anode Heel Effect |
| By angling the face of the anode target a larger actual focal spot size can be maintained (dissipating more heat) and a smaller effective focal spot size (better spatial resolution) can be created. This is known as the _______ | Line Focus Principle |
| A smaller effective focal spot size has better _______ | Spatial Resolution |
| Blooming is an increase in ________+ caused by electrostatic repulsion | Actual focal spot size |
| The limiting action of the electron cloud which prevents more electrons from escaping the filament regardless of how much hotter the filament gets | Space Charge Effect |
| ________ can produce additional unwanted x-rays | Scattered Electrons |
| __________ Can increase image blur because electrons strike areas of the anode outside the focal spot | Off-Focus Radiation |
| A larger actual focal spot _______ | Dissipates more heat |
| The radiographer depresses the prep/rotor switch before making an exposure. Which events occur? | The rotating magnetic fields cause the rotor to rotate The stator creates a changing magnetic field. |
| At what point in the characteristic interaction is the x-ray produced? | When an electron drops down to fill a vacancy in a lower shell |
| If a a projectile electron passes very close to the nucleus and loses most of its kinetic energy, what type of x-ray photon will most likely result? | A high-energy Bremsstrahlung photon |
| The ________ is the thickness of absorbing material needed to reduce beam intensity to one-half its original intensity | Half-Value Layer (HVL) |
| What does a voltage waveform represent | How voltage changes over time |
| The _______ produces better image detail | Small Focal Spot |
| If the technologist increases the mA selection, what happens first? | The filament becomes hotter and releases more electrons |
| A _______ would display pitting | Stationary Anode |
| Single Phase Generator c-value | 1 |
| 3 Phase, 6 Pulse Generator c-value | 1.35 |
| High Frequency Generator c-value | 1.45 |
| 3 Phase, 12 Pulse Generator c-value | 1.41 |
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