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RT Review Part 2
Question 51-100
| Question | Answer |
|---|---|
| Tungsten is used for the filament because it: 1. does not vaporize easily 2. has a high melting point 3. provides for higher thermionic emissions | all |
| The neck and base of the anode in the x-ray tube is made of: a. thorium b. molybdenum c. copper d. rhenium | b. molybdenum |
| In most single phase units, rotating anodes revolve at a speed of: a. 1200 rpm b. 2000 rpm c. 3400 rpm d. 6200 rpm | c. 3400 rpm |
| The size of the actual focal spot is primarily controlled by the size of the: 1. focusing cup 2. anode angle 3. tungsten filament | 2 and 3 |
| Which may result from the application of excessive heat to the anode of the x-ray tube: 1. pitting and cracking of the anode 2. tungsten coating on the glass envelope 3. reduced x-ray output | all |
| The tube filament are made of: a. molybdenum b. thoriated tungsten c. copper d. rhenium stell | b. thoriated tungsten |
| The source of electrons in a rotating anode tube is: a. rotor b. anode c. filament d. focal track | c. filament |
| Diagnostic x-ray tubes have target angles of: a. 5-15o b. 18-20o c. 22-25o d. 25-35o | a. 5-15o |
| The accuracy of the exposure timer of a single phase x-ray machine is tested with a: a. sensitometer b. capacitor c. dosimeter d. spinning top | d. spinning top |
| Increasing the potential difference between the cathode and anode increases x-ray: a. number b. energy c. wavelength d. velocity | b. energy |
| Most rad equipment produced today will have a timer that is: a. mechanical b. electronic c. synchronous d. photo regulated | b. electronic |
| The device that measures the optical density in any region of the film is a: a. penetrometer b. densitometer c. sensitometer d. step wedge | b. densitomter (a and c measures kvp |
| With full wave-rectification, how many dots would show on a spinning-top exam, if the exposure time was 100 milliseconds: a. 2 b. 4 c. 6 d. 12 | d. 12 |
| All of the following are found in the primary branch of the circuit except: a. autotransformer b. timer c. exposure switch d. solid state rectifier | d. solid state rectifier |
| Kilovoltage selection is accomplished by adjustment of the: a. transformer b. rectifier c. autotransformer d. tube filament current | c. autotransformer |
| If a transformer has 1,000 primary turns and 10,000 secondary turns then an input voltage of 120 volts would create an output of: a. 12 b. 120 c. 1200 d. 12,000 | c. 1200 (use ration 1000/120 = 10,000/x) |
| In order to examine film-screen contact, the radiographer would use a: a. beam alignment tube b. perforated metal mesh c. crossed grid d. spinning top | b. perforated metal mesh |
| The transformer that adjusts the voltage to the filament of the tube is the: a. auto transformer b. step up transformer c. high tension transformer d. step down transformer | d. step down transformer |
| During linear tomography, the part of the image that is the sharpest is: a. at the focal point, fulcrum level b. 2" above the object plane c. below the plane d. 2" below the plane | a. at the focal point, fulcrum level |
| Which imaging unit stores electric charges on metallic plates? a. capacitor discharge portables b. battery powered portable c. high frequency mobile d. image intesified, c-arm unit | a. capacitor discharge portables |
| Which part of image intensification converts the light image into electronic image for monitor viewing? a. fluoro x-ray tube b. vidicon tube c. input screen d. photocathode | b. vidicon tube |
| In rad, the contrast between bone and soft tissue is due primarily to which of the following: a. classic scattering b. photoelectric absorption c. Compton d. pair production | b. photoelectric absorption |
| The ability of the image intensifier tube to increase the illumination level of the image is called: a. brightness gain b. minification gain c. flux gain d. output gain | a brightness gain |
| What type of shield is employed for juvenile scoliosis exams? a. breast b. shadow c. lens d. contact | a. breast |
| The television camera tube available for television fluoroscopies is the: 1. plumbicon 2. mirrorcon 3. vidicon | 1 and 3 |
| Specific area shielding is indicated when exposures from primary beam is directed to: 1. breast 2. gonads 3. lens of the eyes | all |
| What is the brightness gain of most image intensifiers? a. 2000-4000 b. 5000-20,000 c. 25,000-40,000 d. 50,000-60,000 | b. 5000-20,000 |
| Image intensified systems should have a source to tabletop distance of: a. 6 in b. 12 in c. 15 in d. 20 in | c. 15 in |
| A chart or graph that represents the relationship between exposure and density is called: 1. H and D curve 2. characteristic curve 3. sensitometric curve | all |
| If an exposure is taken on a full-wave rectified single phase unit at 0.2 second and demonstrates 12 dots, it most likely has a/an: a. pitted anode b. faulty rectifiers c. proper exposure level d. line voltage drop | b. faulty rectifiers |
| Using PACS, the information recorded on the imaging plates is conveyed to the computer system by the: a. processor b. reader c. network d. windowing process | b. reader |
| Which tomographic movement requires the longest exposure time to complete the movement? a. linear b. spiral c. circular d. hypocycloidal | d. hypocycloidal |
| When constructing a characteristic curve, the apparatus used is called: 1. electrostatic lense 2. densitometer 3. penetrometer | 1 and 2 |
| The layer of the intensifying screen closest to the x-ray film is the: a. reflective layer b. protective coating c. base d. phosphor | b. protective coating |
| The heat units for a single-phase rectified unit equal 3,000. What would be the heat units for a 3-phase 12-pulse rectified unit using the same factors? a. 3,000 b. 3750 c. 4050 d. 4230 | d. 4230 (3000 x 1.41) |
| Which of the following is an example of a variable transformer? a. autotransformer b. high tension transformer c. filament transformer d. step-up transformer | a. autotransformer |
| Assume 300mA, .10 sec, 74kV, 40"SID is used to make 4 exposures of the skull. What is the total amt of heat created, if 3-phase,6-pulse generator is used? a. 479,520 HU b. 239,760 HU c. 11,988 HU d. 2,220 HU | c. 11,988 HU (mAs x kVp x 1.35) |
| Scatter rad reaching the film is controlled by: 1. focal spot size 2. beam restrictors 3. grids | 2 and 3 (focal spot controls recorded detail) |
| When projectile electrons stray and interact at positions on the anode other than the focal spot, you will have: a. distortion b. scatter radiation c. poor resolution d. off-focus radiation | d. off-focus radiation |
| Which rad unit produces the greatest amt of heat once an exposure is made? a. single phase, 1/2 wave unit b. single phase, full wave c. 3-phase, 6 pulse, d. 3-phase, 12 pulse | d. 3-phase, 12 pulse unit |
| Solid state diodes create an electric current that is: a. low voltage, AC b. high voltage, DC c. high voltage, AC | b. high voltage, DC (diodes - transittor - one direction) |
| When performing linear tomography, the imaginary pivot point about which the tube and film move is called the: a. fulcrum b. thickness of the cut c. object plane d. tomographic angle | a. fulcrum |
| Which of the following are considered to be multidirectional tomographic movements: 1. trispiral 2. elliptical 3. hypocyclosial | all |
| When a tomographic angle is less than 10 degrees, it is called: a. multi-directional tomography b. zonography c. stereo radiography d. multi-plane tomography | b. zonography |
| Which of the following is employed in magnification radiography? a. low ratio grids b. small focal spot c. minimal SID d. high speed screens | b. small focal spot |
| The accuracy of a positive beam limitation device must be: a. equal to the photon stream b. w/in 2% of SID c. equal to the object size d. w/in 4" of the film edge | b. w/in 2% of SID |
| Carbon fiber is associated with the construction of: a. digital film b. laser film c. automatic processing d. cassettes | d. cassettes (carbon fiber is radiolucent) |
| The 2 components of the image intensifier tube that produces visible light are the: a. input screen & photocathode b. input & output screens c. photocathode and focal spot d. focal point & photocathode | b. input and output screens |
| When using a C-arm II, magnification of the fluoroscopic image happens when: 1. changing to a small input screen 2. the voltage inside the tube increases 3. the focal point shifts towards the output screen | 2 and 3 |
| Assume AEC is used for a PA chest. The center sensor was activated instead of the 2 outer sensors. Which following is likely to happen? a. faster time, normal density b. faster time, decr dens c. longer time, incr density d. longer time, decreased density | c. longer time, decreased density |
Created by:
radtechstudent