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RADT 334 X-Ray Tube
Radiographic Physics review covering x-ray tube
| Question | Answer |
|---|---|
| What system is an external component of the x-ray tube that consists of the floor to ceiling, ceiling and c-arm? | support system |
| What makes up the enclosure component in the external component of the x-ray tube? | glass and metal |
| What part of the internal component of the x-ray tube contains the filament(s) and focusing cup? | cathode |
| What are the parts of the anode in the internal component of the x-ray tube? | rotating and stationary |
| What part of the x-ray tube controls leakage and scatter radiation, isolates the high voltages and provides a means to cool the tube? | protective housing |
| The x-ray tube is a vacuum containing two electrodes (cathode and anode), what maintains this vacuum? | enclosure |
| What is the negative side of the x-ray tube? | cathode |
| What is the coil of wire that emits electrons when heated? | filament |
| Where is the filament embedded? | focusing cup |
| The focusing cup is negatively charged to keep the ________ to a small area of the anode. | electron beam |
| What is the space charge called? (when the electrons are in the vicinity of the filament before acceleration to the anode) | electron cloud |
| When the cloud of electrons makes it hard for subsequent electrons to be emitted because of electrostatic repulsion this is referred to as _________. | space charge effect |
| When the tube current rises with increasing voltage to a maximum value, this is referred to as the ________. | saturation current |
| When better spatial resolution is required what focal spot would you want? | small |
| What focal spot would you use when large body parts are imaged and when higher techniques are used that will generate high heat? | large |
| What is the positive side of the x-ray tube? | anode |
| What are the three functions of the anode? | electrical conductor, mechanical support for the target and thermal dissipater |
| Which material of the anode contains a high atomic number, thermal conductivity and a high melting point? | tungsten |
| Which materials of the anode have a lower mass density and a high melting point? | molybdenum and graphite |
| Where are x-rays emitted? | the focal spot |
| An angled target allows for a larger area for heating while maintaining a _______. | small focal spot |
| The effective focal spot is the area projected onto the _____ and ______. | patient and image receptor |
| Where are the electrons interacting with the target? | actual focal spot |
| When the intensity of the x-ray beam is weaker on the anode side, this is called? | anode heel effect |
| What three areas on the patient can being aware of the anode heel effect allow for correction resulting in a better image? | foot, chest and abdomen |
| What type of radiation reduces image contrast, increases skin dose, extends the size of the focal spot and are produced outside of the focal spot? | extrafocal radiation |
| What is the most frequent cause of abrupt failure in an x-ray tube? | electron arcing |
| Excessive heat results in what to the x-ray tube? | reduced tube life |
| What are the three types of rating charts? | radiographic rating chart, anode cooling chart and housing cooling chart |
Created by:
sadugan
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