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Rad107 Quiz 1 review
| Question | Answer |
|---|---|
| What is a operating console? | The operating console allows radiographers to control the x-ray tube current and voltage so that the useful x-ray beam is of proper intensity and quality |
| What does thermionic emission at the filament create? | Space charge |
| What is the ripple percentage of a single-phase waveform? | 100% |
| What is the most common cause of tube failure? | Tungsten vaporization |
| The cathode side of the tube should be directed toward the ___ part of the patient | thicker |
| The external structure of the x-ray tube includes the support structure, the protective housing, and the _____ | glass envelope |
| Because of the line focus principal , the effective focal spot size decreases with decreasing_____ | target angle |
| What is the difference in the waveformbetween the primary and secondary sides of the high voltage transformer? | amplitude |
| What is the most common cause of tube failure? | Electron arcing from vaporized tungsten |
| What is located inside the glass envelope? | Cathode |
| How many times does the step up transformer increase voltage? | 500 to 1000 times |
| What can cause tube failure? | Long exposure times |
| What type of circuits does the operating console contain? | Low voltage only |
| How does the effective focal spot size compare to the actual focal spot size? | Smaller than the actual focal spot size |
| What turns the rotating anode? | Induction motor |
| What happens to the effective focal spot size as the target angle decreases? | It decreases |
| What external structures are included in the x-ray tube? | Support structure, protective housing, and glass envelope |
| A dual focus tube has two ____ | filaments |
| The filament in an x ray tube is about ____ cm in length | 1 to2 |
| The rotating anode is turned by a | magnetic field |
| Full-wave rectified, three phase units provide an x ray beam at ___ pulse(s) per second | 360 |
| Thermionic emission at the filament determines the ____ across the x-ray tube during an exposure | milliamperage |
| What is the primary material used in a photostimulable phosphor (PSP) | Barium fluorohalide with europium |
| What is the function of europium in the PSP plate | Acts as an activator for electron trapping |
| What determines spatial resolution in computed radiography | Size of the laser beam |
| Which component detects emitted light in a CR system | Photodiode |
| What is the purpose of the erase cycle | Remove residual image (prevent ghosting) |
| What type of light stimulates the imaging plate during CR reading | Infrared laser light |
| What takes place during the erase step in the production of a PSL signal | Residual metastable electrons are moved to the ground state by an intense light |
Created by:
dani.vouga04