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The type of x-ray tube designed to turn on and off rapidly, providing multiple short, precise exposures, is (pg. 279 #2)
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Typical examples of digital imaging include (pg. 279 #3)
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RADT 465: Equipment
Equipment Operation and Quality Control
| Question | Answer |
|---|---|
| The type of x-ray tube designed to turn on and off rapidly, providing multiple short, precise exposures, is (pg. 279 #2) | Grid-Controlled |
| Typical examples of digital imaging include (pg. 279 #3) | MRI, CT, CR |
| What circuit deices operate on the principle of self-induction? (pg. 279 #5) | Autotransformer, Choke coil |
| If a high-voltage transformer has 100 primary turns and 50,000 secondary turns and is supplied by 220 V and 100 A, what are the secondary voltage and current? (pg. 280 #7) | 200 mA and 100 kV |
| When using the smaller field in a dual-field image intensifier (pg. 280 #9) | The image is magnified |
| The minimum response time of an automatic exposure control "AEC" (pg. 280 # 10) | Is its shortest possible exposure time |
| What are some characteristics of the x-ray tube? (pg. 281 #13) | The target material should have a high atomic number and a high-melting point, the useful beam emerges from the port window, the cathode assembly receives both low and high voltages |
| Congruence of the x-ray beam with the light field is tested using (pg. 281 #18) | Radiopaque objects |
| Delivery of large exposures to a cold anode or the use of exposures exceeding tube limitation can result in (pg. 281 #19) | Cracking of the anode, rotor-bearing damage |
| As window level increases (pg. 282 #22) | Brightness increases |
| Which of the following is/are components of the secondary, or high voltage, side of the x-ray circuit (pg. 282 #23) | Rectification system |
| A backup timer for the AEC serves to (pg. 282 #25) | Protect the patient from overexposure, protect the x-ray tube from excessive heat |
| A slit camera is used to measure (pg. 282 #28) | Focal-spot size, spatial resolution |
| What will improve the spatial resolution of image-intensified images? (pg. 283 #30) | A very thin coating of cesium iodide on the input phosphor and a smaller diameter input screen |
| The advantages of collimators over aperture diaphragms and flare cones include (pg. 283 #31) | The variety of field sizes available and more efficient beam restriction |
| The voltage ripple associated with a three-phase, six pulse rectified generator is about (pg. 283 #35) | 13% |
| A high speed electron entering the tungsten target is attracted to the positive nuleus of a tungsten atom and, in the process, is decelerated results in (pg. 284 #37) | Bremsstrahlung radiation |
| What is used in digital fluoroscopy, replacing the image intensifier's television camera tube? (pg. 284 #40) | Charge-coupled device |
| A three-phase timer can be tested for accuracy using a synchronous spinning top. The resulting image looks like (pg. 284 #41) | Solid arc, with the angle (in degrees) representative of the exposure time |
| The procedure whose basic operation involves reciprocal motion of the x-ray tube and film is (pg. 284 #43) | Tomography |
| When the radiographer selects kilovoltage on the control panel, what device is adjusted? (pg. 284 #45) | Autotransformer |
| Star and wye configurations are related to (pg. 284 #46) | Three-phase transformers |
| What is the device that directs the light emitted from the image intensifier to various viewing and imaging apparatus? (pg. 285 #47) | Beam splitter |
| What contributes to inherent filtration? (pg. 285 #49) | X-ray tube glass envelope, x-ray tube port window |
| All of the following x-ray circuit devices are located between the incoming power supply and the primary coil of the high-voltage transformer (pg. 285 #53) | The timer, kilovoltage mete, and autotransformer |
| Disadvantages of moving grids over stationary grids include which of the following? (pg. 286 #55) | They can prohibit the use of very short exposure times and they increase patient radiation dose |
| The functions of a picture archiving and communication system (PACS) include (pg. 286 #56) | Acquisition of digital images and storage of digital images |
| How many half-value layers will it take to reduce and x-ray beam whose intensity is 78 R/min to an intensity of less than 10 R/min (pg. 286 #57) | 3 |
| The kV setting on radiographic equipment must be tested annually and must be accurate to within (pg. 286 #58) | +/-4 kV |
| An incorrect relationship between the primary beam and the cneter of a focused grid results in (pg. 286 #59) | Grid cutoff and insufficient radiographic density |
| The x-ray tube in a CT imaging system is most likely to be associated with (pg. 286 #60) | A pulsed x-ray beam |
| Conditions that contribute to x-ray tube damage include (pg. 287 #62) | Lengthy anode rotation and exposures to a cold anode |
| The total brightness gain of an intensifier is the product of (pg. 287 #63) | Flux gain and minification gain |
| What information is necessary to determine the maximum safe kilovoltage using the appropriate x-ray tube rating chart? (pg. 287 #64) | Milliamperage and exposure time and focal spot side |
| A spinning top device can be used to evaluate (pg. 287 #65) | Timer accuracy and rectifier failure |
| The device used to change alternating current to unidirectional current is (pg. 287 #67) | A solid state diode |
| If the distance from the focal spot to the center of the collimator's mirror is 6 in., what distance should the illuminator's light bulb be from the center mirror? (pg. 287 #68) | 6 in. |
| Deposition of vaporized tungsten on the inner surface of the x-ray tube glass window (pg. 288 #72) | Acts as additional filtration |
| With what frequency must radiographic equipment be checked for linearity and reproducibility (pg. 289 #79) | Annually |
| Exposures less than the minimum response time of an AEC may be required when (pg. 289 #86) | Using high milliamperage and using fast film screen combinations |
| Which of the following isare associated with magnification fluoroscopy? (pg. 290 #87) | Higher patient dose than nonmagnification fluoroscopy, higher voltage to the focusing lenses, and image intensifier focal point closer to the input phosphor |
| Advantages of battery powered mobile x-ray units include their (pg. 290 #88) | Ability to store a large quantity of energy and ability to store energy for extended periods of time |
| What modes of the trifield image intensifier will resul in the highest patient dose? (pg. 290 #89) | 12 inch mode |
| The AEC device can operate on which of the following principles (pg. 290 #92) | A photomultiplier tube charged by a fluorescent screen and a parallel plate ionization chamber charged by x-ray photons |
| Which of the following functions to increase the milliamperage (pg. 290 #93) | Increase heat of the filament |
| If 92 kV and 15 mAs were used for a particular abdominal exposure with single phase equipment, what milliampere-seconds value would be required to produce a similar radiograph with three-phase 12 pulse equipment (pg. 290 #94( | 7.5 |
| Fractional focus tubes with a 0.3 mm focal spot or smaller, have special application in (pg. 290 #95) | Magnification radiography |
| Which of the following devices is used to control voltage by varying resistances? (pg. 292 #100) | Rheostat |
| Which of the following combinations will offer the greatest heat loading capacity? (pg. 293 #108) | 10 degree target angle, 1.2 mm actual focal spot |
| Which of the following would be appropriate IP front materials? (pg. 293 #109) | Magnesium and Bakelite |
| How often are radiographic equipment kV settings required to be evaluated (pg. 293 #110) | Annually |
| Accurate operation of the AEC device depends on (pg. 294 #113) | Positioning of the object with respect to the photocell and beam restriction |
| The image intensifier's input phosphor generally is composed of (pg. 294 #114) | Cesium iodide |
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rdwilliams1
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