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all of the following are associated with the anode except: A. the line focus principal, B. the heel effect C. the focal track. D. therminic emission
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the type of x ray tuce designed to turn on an off rapidly, providing multiple short, percise exposures, is
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| Question | Answer |
|---|---|
| all of the following are associated with the anode except: A. the line focus principal, B. the heel effect C. the focal track. D. therminic emission | D therminic emission |
| the type of x ray tuce designed to turn on an off rapidly, providing multiple short, percise exposures, is | grid controlled |
| name two sricut devices operated on the principal of self induction | autotransrormer, choke coil |
| if esposure factors of 85 kVp, 400 mA, and 12 ms yeils an output exposure of 150 mR, what is the milliroentgens per milliampere-seconds (mR/mAs) | 400mAx12ms=4.8 mAs 150mR/4.8mAs=31.25 mR/mAs |
| 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 | (Vs/Vp)=(Ns/Np) (Ns/Np)=(Ip/Is) (x/200)=(50,000/100) x=11,000,000 (110 kVp) (50,000/100)=(100/x) 50,000=10,000 2=0.2 A(200mA) |
| when using a smaller feild in a dual-feild image intensifier | the image is magnified |
| the electron cloud within the x ray tube is the product of a process called | thermonic emission |
| name something that causes pitting, or many small surface melts, of the anode's focal track | repeated, frequent overloading |
| which of the following woudl pose the least hazard to a particualr anode A. 1.3 mm focal spot, 92 kVp, 1.5 mAs B. 0.6 mm focal spot, 80 kVp, 3 mAs C. 1.2 mm, 70 kv, 6 ma D. 0.6, 60 kv, 12 mAs | A. 1.3 mm focal spot, 92 kVp, 1.5 mAs |
| congruence of the x ray beam with the light feild is tested using | radiopaque objects |
| if the primary coil of a high voltage transformer is supplied by 220 V and has 400 turns and the secondary coil has 100,000 turns, what is the voltage induced in the secondary coil | (Vs/Vp)=(Ns/Np) (Ns/Np)=(Ip/Is) (x/220)=(100,000/400) 400x=22,000,000 x=55,000 V 55Kv |
| name two advantages to a capacitor discharge mobile x ray equipment | compact size and light weight |
| name the system that is a component of the secobdary, or high voltage, side of the x ray circut | recitification system |
| what part of the x ray tube converts electrical enerfy to mechanical energy | motor |
| a slit camera is used to measure what two things | focal spot size and spatial resoultion |
| in what modality woudl a cassette front with very low absorption properties be especially important | mammography |
| name two things that woudl help improve the spatial resolution of imate intensified images | a very thin coating of cesium iodide on the input phosphor and a smaller diameter input screen |
| the advantages of colliamtior over apeture diaphragms and flare cones include (2) | a variety of feild sizes available and more efficent beam restriction |
| during which type of radiation does an electron approaching a positive nuclesr charger changes direction and loses an electron | Bremsstrahlung |
| the voltage ripple assicated with a three phase, six pulse recitified generator is about | 13% |
| the device that recieves the remnant beam, converts it into light, and then increases the brigntness of that light is the | image intensifier |
| a high speed electron entering the tungsten targes is affracted tot he positice nucleus of a tungsten atom, and in the process is decelerated. This results in what type of radtiation | bremsstrahlung |
| name the device that is used in digital fluoroscopy, replacing the image intensifier's television camera tube | charged-coupled device |
| a three phase timer can be tested for accuracy using a synchronous spinning top. The resulting image looks like | solid arc, witht he angle (in degrees) representative of the exposure time |
| in ehich type of equipment dies kilovoltage decreasing during the actual length of the exposure | condenser-discharged mobile equipment |
| star and wye configurations are related to | three-phase transformers |
| what is the decive that directs the light emitted from the ii to various viewing and imaging apparatus | beam splitter |
| as electrons impinge on the target surface, less than 1%V of their kinetic energy is changed to | x ray |
| what part of the x ray tube contributes to inherient filtration | x ray tube glass envelope |
| a quality control (QC) program includes checks on thich of the following radiographic equipment: A. reproducibility B. linerality C. positive beam limitation/automatic collimation | all |
| characteristics of x ray phonont include what two | penetrating effects on all matter an ionizing effect on air |
| name the three x ray circut devices that are located between the incoming power supply and the primary coil of the high voltage transformer | the timer, kv meter, and auto transformer |
| what system functions to compensate for changing patitnet/part thichkness during fluoro procedures | ABC |
| name two disadvantages of miving grids over stationary grids | prohibit the use of very short exposure times & increase patient doseq |
| capacitor-discharge mobile x ray units are capacitors to power the | tube |
| the x ray tube in a CT imaging sustes is most likelu to be assiciated with | a pulsed x ray beam |
| name two conditiond that contrubute to x ray tube famage include | lengthly anode rotation & exposures to a cold anode |
| name two pieces of information that is necessary to determinr the max safe kv using the approporite x ray tube rating chart | milliamperage and exposure time & folca spot size |
| a spinning to device can be sued to evaluate (2) | timer accuracy and recitifier failure |
| a decive used to ensure reproducibible radiographs, regardless of tissue density variations | phototimer |
| the device used to change alternating current to ujnidirectional current is | a solid state diode |
| th maintain image clarity in a image intensifier system, the path of th electron flow from the photocathode to the output phosphor is controlled by | electrostatic lenses |
| deposition of vaporized tungsten on the inner surface of the x ray tube glass window acts as what | additional filtration |
| design characteristics of x ray tube targets that determine heat capacity include the A. rotation of the anode B. diameter of the anode C. size of the focal spot | all |
| what term describes the amount of electric charge flowing per second | resistance |
| which of the following is the correct formula for determining heat units for a three phase 12 pulse x ray machine a. kvpxmasxtime b. mAxkVpxmAs c. mAxtimexkVpx1.41 | c. mAxtimexkVpx1.41 |
| which part of an induction motor is located within the x ray tube glass envelope | rotor |
| which part of an induction morot is locate outside the x ray tube glass envelope | stator |
| capacitor discahge mibile x ray units 1. use grid controlled x ray tube 2. are typically charged before the day's work 3. provide a direct current output | 1 & 3 |
| advantages of battery powered mobile x ray units include theri | ability to store a large quantity of energy and ability to store energy for extendeed periods of time |
| circut devices that permit electrons to flow in only one direction are | solid state diodes |
| if 92 kV and 15 mAs were sued for a particualr abdominal exposure with single phase equipment what milliampere seconds value would be required to produce a similar radiograph with three phase 12 pulse equipmentq | 7.5 (look this up # 94) |
| which of the following devices is used to control voltage by varing resistance | Rheostat |
| which of the following formulas would the radiographer use to determine the total number of heat units produiced with a given exposure using three phase, six pulse equipment A.mAXtimeXkVP B mA *time*kVP*3.0 c. mA*time*kVp*1.35 | c. mA*time*kVp*1.35 |
| with three phase equipment the voltage actoss the x ray tube 1. drops to zero every 180 degrees 2. is 87% to 96 % of the max value 3. is at nearly constant potential | 2 & 3 only |
| raduigraphers from a particualr single-pahse full wave recitified x ray unit were overexposed, using known correct exposures. A spinning top test was prefoemed at 200 mA, 0.05 s, and 70 kVp, and 8 dots were seen on the finished film. What was incorrect | the 0.05 s station in inaccurate |
| accurate operation of the AEC device depends on 1. the thickness and density of the object 2. positioning of the object with respect to the photocell 3. beam restriction | 2 & 3 |
| the II input phosphor generally is composed of | cesium iodide |
| the device used to test the accuracy of the x ray timer is the | spinning top |
| which of the following statements regarding dual x ray absorptry is (are )true 1. It is a low dose procedure 2. two x ray photon energies are used 3. photon attenuation by bone is calculated | all |
Created by:
amanda.clark