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Physic 2 unit 2 HW
| Question | Answer |
|---|---|
| The three principle parts of an x-ray imaging system are: | x-ray tube, control console, and high voltage generator |
| The primary purpose of the glass envelope of an x-ray tube is to: | Provide a vacuum |
| The protective housing of an x-ray tube is designed to: | reduce the hazard of leackage radiation |
| A diagnostic x-ray tube is an example of which of the following? | Diode |
| The large filament is used during radiography when the heat load is: | high and visibility of detail is less important |
| In most x-ray tubes there are two filaments to: | Provide two focal spots |
| The focusing cup : | Is usually made of thoriated tungsten |
| Once filament tempature becomes adequate, a further small rise in filament tempature will cause the tube current to: | Increase very much |
| The cathode beam of an x-ray tube is the: | Focused electron beam within the tube |
| The x-ray tube current: | is controlled by the filament current |
| Most x-ray tubes used for radiography: | Are dual-focus tubes |
| The cathode is: | one of the two parts of a diode |
| When a filament burns out | The filament current goes to zero |
| The space charge effect: | Occurs in the vicinity of the cathode |
| The x-ray tube filament: | Conducts approximately 5 A |
| If saturation is achieved and the filament current is fixed, tube current | remains fixed |
| X-ray tube current: | is zero when filament current is below therionic emission |
| A stationary-anode x-ray tube: | incorporates the line-focus principle |
| The heel effect occurs because of: | x-ray absorption in the anode |
| The main reason for using the line focus principle is to: | reduce focal-spot size |
| Rotating anode x-ray tubes | incorporate the line-focus principle |
| X-ray intensity is higher on the cathode side than on the anode side because of which of the following? | X--ray absorption in the anode |
| Which of the following target angles is characteristic of a rotating anode x-ray tube? | 10 degrees |
| Small target angles result in which of the following | Small focal spot size |
| Molybdenum is used foe anode stem material because of which of the following? | It has a high atomic number |
| Tungsten is the choice material for x-ray anodes because of its: | high atomic number |
| The effective focal spot is | smaller than the actual focal spot |
| The heel effect | requires that the cathode be positioned to the thicker anatomy |
| What is the prominent engineering difficulty in the manufacture of high-speed rotating anodes? | balance of the rotor |
| Which of the following is a component of an electromagnetic induction motor? | Stator |
| Necessary properties of x-ray target materials include which of the following | high melting point |
| The anode angle of an x-ray tube is increased to give which of the following? | higher heat capacity |
| Which of the following components of a diagnostic x-ray tube is on the positive side of the tube? | The stator |
| As the anode target angle increases | Effective focal spot size increases |
| A stationary anode will most likely be used in which of the following? | Dentistry |
| Which of the following is not a function of the anode? | Thermionic emission |
| Which of the following is the principle hurdle in the design of an x-ray anode for high-capacity radiologic technologist? | Heat dissipation |
| The high speed rotor(10,000 RPM) permits longer exposure time than the low speed rotor at single phase operation(3400 RPM)(T/F) | True |
| Most of the troublesome heat generated in an x-ray tube occurs at the filament(T/F) | false |
| Generally a small focal spot allows longer exposure times than a large focal spot(T/F) | false |
| The radiographic rating chart reports the time that should elapse between exposures(T/F) | false |
| It is not possible to exceed the heat capacity of the housing without first exceeding that of the anode(T/F) | false |
| A tube can become "gassy" because of the anode overheating and the release of the gas. (T/F) | true |
| The radiographic rating chart is designed primarly to protect the filament.(T/F) | False |
| Rotor spped does not influence heat capacity.(T/F) | False |
| Heat units (HU) can be expressed as exposure rate in R/min(Gya/min) (T/F) | false |
| How many units are produced by the following radiographic technique: 100 kVp, 150mA, 500ms, single phase, 3400 rmp, 0.6mm focal spot | 7500 HU |
| Look at chart What is the maximum number of heat units that the anode can absorbe? | 300,000 HU |
| Look at chart How long would it take the tube to cool down completely from maximum heat as determined in the previous question? | 8min |
| Look at chart If the anode absorbs 200,000 HU, how long will it take to cool completely? | 6.5min |
| Look at chart If an anode absorbs 180,000 HU how long will it be before another 180,000 HU can be absorbed? | 15min |
| If a single exposure with factors slightly exceeding those permitted by the appropriate radiographic rating chart, which of the following would be the most probable result? | The useful life of the tube would be reduced |
| If a single exposure with factors greatly exceeding those permitted by the appropriate radiographic rating chart, which of the | The anode would pit or crack |
| Which of the following conditions will not damage the x-ray tube | Exceeding the prescribed SID |
| In the design of a rotating anode x-ray tube | Most anodes rotate at 3400 or 10000 rpm |
| The formula for heat units (HU) in a single phase high voltage generator is | kVp x mA x s |
Created by:
atesta0824
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