COMPREHENSIVE EQUIPM
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| The minimum response time of an automatic exposure control (AEC) | show 🗑
|
||||
| show | 1. Increase in added filtration
2. Increase in kilovoltage
🗑
|
||||
| show | the actual focal spot is larger than the effective focal spot.
🗑
|
||||
| In fluoroscopy, the automatic brightness control adjusts the | show 🗑
|
||||
| Which of the following devices is (are) component(s) of a typical fluoroscopic video display system? | show 🗑
|
||||
| The image on the image intensifier's output phosphor may be displayed for viewing through the use of either | show 🗑
|
||||
| show | a TV camera tube and a TV monitor
🗑
|
||||
| The TV camera tube (usually a Plumbicon or Vidicon) converts the output phosphor image into an | show 🗑
|
||||
| show | a visible light image
🗑
|
||||
| To determine secondary voltage | show 🗑
|
||||
| show | Nsecondary = Iprimary
Nprimary = I secondary
🗑
|
||||
| With full-wave-rectified current and a possible 120 dots (pulses) available per second, one should visualize | show 🗑
|
||||
| Circuit devices that will conduct electrons in only one direction are | show 🗑
|
||||
| show | direction
🗑
|
||||
| show | older equipment
🗑
|
||||
| show | today's x-ray equipment
🗑
|
||||
| Rectification systems are found between | show 🗑
|
||||
| show | vary voltage or current
🗑
|
||||
| What is the device that directs the light emitted from the image intensifier to various viewing and imaging apparatus? | show 🗑
|
||||
| The light image emitted from the output phosphor of the image intensifier is directed to the | show 🗑
|
||||
| The light is directed to these places by a | show 🗑
|
||||
| show | recording device, while a small portion goes to the TV so that the procedure may continue to be monitored during filming
🗑
|
||||
| show | Rheostat
🗑
|
||||
| The autotransformer operates on the principle of self-induction and functions to | show 🗑
|
||||
| The high-voltage transformer | show 🗑
|
||||
| The rheostat is | show 🗑
|
||||
| show | filament circuit
🗑
|
||||
| show | a device used to protect the circuit elements from overload by opening the circuit in the event of a power surge
🗑
|
||||
| Which of the following will improve the spatial resolution of image-intensified images? | show 🗑
|
||||
| show | recorded detail
🗑
|
||||
| The effect of the input screen's phosphor layer is similar to the effect of the phosphor layer thickness in intensifying screens; that is, as the phosphor layer can be made thinner, recorded detail | show 🗑
|
||||
| show | spatial resolution
🗑
|
||||
| does a brighter image affect resolution? | show 🗑
|
||||
| show | 70 keV
🗑
|
||||
| Characteristic radiation makes up about what percent of the primary beam? | show 🗑
|
||||
| Multifield image intensifier tubes are usually either dual-field or tri-field and are designed this way in order to permit | show 🗑
|
||||
| show | back—closer to the input phosphor—and a smaller portion of the input phosphor is utilized, As a result, the FOV decreases and magnification increases, producing better spatial resolution
🗑
|
||||
| as the focal point moves back | show 🗑
|
||||
| show | signal-to-noise ratio (SNR), with mA being the signal
🗑
|
||||
| show | electrostatic lenses
🗑
|
||||
| show | a fluorescent light image
🗑
|
||||
| show | photocathode, which is made of a photoemissive alloy (usually a cesium and antimony compound)
🗑
|
||||
| The fluorescent light image strikes the photocathode and is converted to | show 🗑
|
||||
| The electrons are carefully focused, to maintain image resolution, by the | show 🗑
|
||||
| show | that it allows the use of auxiliary imaging devices such as a cine camera or spot film camera.
🗑
|
||||
| show | 1. using high mA.
2. using fast film-screen combinations.
🗑
|
||||
| show | greater heat load, but more anode heel effect
🗑
|
||||
| Components of digital imaging include | show 🗑
|
||||
| show | 1. High-voltage transformer
2. Filament transformer
🗑
|
||||
| show | 1. rotation of the anode.
2. diameter of the anode.
3. size of the focal spot.
🗑
|
||||
| Which of the following is (are) characteristics of the x-ray tube? | show 🗑
|
||||
| show | the backup timer would protect the patient from overexposure and the x-ray tube from excessive heat load.
🗑
|
||||
| The brightness gain of image intensifiers is | show 🗑
|
||||
| show | high voltage (this is flux gain)
🗑
|
||||
| the output phosphor is only a fraction of the size of the input phosphor, and this decrease in image size represents | show 🗑
|
||||
| Total brightness gain is equal to | show 🗑
|
||||
| show | smaller
🗑
|
||||
| Off-focus, or extrafocal, radiation may be minimized by | show 🗑
|
||||
| Off-focus, or extrafocal, radiation is produced as electrons | show 🗑
|
||||
| show | indistinct images outside the collimated field
🗑
|
||||
| show | off-focus radiation
🗑
|
||||
| show | low-voltage circuit
🗑
|
||||
| The mA meter | show 🗑
|
||||
| Capacitor discharge mobile x-ray units | show 🗑
|
||||
| the capacitor must be charged | show 🗑
|
||||
| show | filaments
🗑
|
||||
| TV camera tubes used in image intensification, such as the Plumbicon and Vidicon, function to | show 🗑
|
||||
| show | The secondary coil of the step-up transformer, The step-down transformer, or filament transformer, and The rectification system
🗑
|
||||
| show | operates on the principle of self-induction; it is a type of variable resistor that may be used to regulate filament current.
🗑
|
||||
| Which of the following information is necessary to determine the maximum safe kVp, using the appropriate x-ray tube rating chart? | show 🗑
|
||||
| Because single-phase, full-wave-rectified current has 120 useful impulses per second, a 1-second exposure of the spinning top should demonstrate | show 🗑
|
||||
| show | six dots
🗑
|
||||
| show | 1. TV camera tube.
2. CCD.
🗑
|
||||
| show | three-phase transformers
🗑
|
||||
| The part of a CT imaging system made of thousands of solid-state photodiodes is the | show 🗑
|
||||
| show | a gantry, a computer, and an operating console
🗑
|
||||
| The gantry component includes | show 🗑
|
||||
| The CT x-ray tube must have a very high short-exposure rating and must be capable of tolerating | show 🗑
|
||||
| To help tolerate the very high production of heat units, the anode must be capable of | show 🗑
|
||||
| show | 1000 mA
🗑
|
||||
| show | thousands of solid-state photodiodes
🗑
|
||||
| show | light
🗑
|
||||
| show | an electronic/digital signal
🗑
|
||||
| show | efficiency of x-ray absorption is increased, and patient dose is decreased
🗑
|
||||
| Detection efficiency is extremely high | show 🗑
|
||||
| The high-voltage generator provides high-frequency power to the CT x-ray tube, enabling | show 🗑
|
||||
| Similar to the high-frequency x-ray tubes used in projection radiography, conventional 60-Hz full-wave rectified power is converted to a higher frequency of | show 🗑
|
||||
| The CT high-frequency generator is often mounted in the | show 🗑
|
||||
| The collimator assembly has | show 🗑
|
||||
| show | x-ray tube that consists of multiple beam restrictions so that the x-ray beam diverges little
🗑
|
||||
| This reduces | show 🗑
|
||||
| The postpatient collimator, or predetector collimator, confines the exit photons before they reach the detector array and determines | show 🗑
|
||||
| show | positioning support for the patient
🗑
|
||||
| Inaccurate indexing can result in | show 🗑
|
||||
| show | a gantry, a computer, and an operating console
🗑
|
||||
| The gantry component includes | show 🗑
|
||||
| The CT x-ray tube must have a very high short-exposure rating and must be capable of tolerating | show 🗑
|
||||
| show | high-speed rotation
🗑
|
||||
| show | 1000 mA
🗑
|
||||
| show | thousands of solid-state photodiodes
🗑
|
||||
| These scintillation crystal (cadmium tungstate or rare earth oxide ceramic crystals) photodiode assemblies convert the transmitted x-ray energy into | show 🗑
|
||||
| That light is then converted into electrical energy and finally into | show 🗑
|
||||
| If the scintillation crystals are packed tightly together so that there is virtually no distance between them, | show 🗑
|
||||
| Detection efficiency is extremely high | show 🗑
|
||||
| The high-voltage generator provides high-frequency power to the CT x-ray tube, enabling | show 🗑
|
||||
| show | 500–25,000 Hz
🗑
|
||||
| The CT high-frequency generator is often mounted in the | show 🗑
|
||||
| The collimator assembly has | show 🗑
|
||||
| show | x-ray tube that consists of multiple beam restrictions so that the x-ray beam diverges little
🗑
|
||||
| show | patient dose and reduces the production of scattered radiation, thereby improving the CT image
🗑
|
||||
| The postpatient collimator, or predetector collimator, confines the exit photons before they reach the detector array and determines | show 🗑
|
||||
| show | positioning support for the patient
🗑
|
||||
| show | missed anatomy and/or double-exposed anatomy
🗑
|
||||
| The advantages of large format spot film cameras, such as 100 mm and 105 mm, over smaller format cameras, such as 70 mm and 90 mm, include | show 🗑
|
||||
| The timer, circuit breaker, autotransformer, kilovoltage selector switch, and (prereading) kilovoltage meter are all located in the | show 🗑
|
||||
| Moving the image intensifier closer to the patient during fluoroscopy | show 🗑
|
||||
| show | distance between the x-ray tube (source) and the image intensifier (image receptor), that is, the SID
🗑
|
||||
| It follows that the distance between the part being imaged (object) and the image intensifier (image receptor), that is, the | show 🗑
|
||||
| The shorter OID produces | show 🗑
|
||||
| show | the intensity of the x-ray photons at the image intensifier's input phosphor increases, stimulating the automatic brightness control (ABC) to decrease the mA and thereby decreasing patient dose
🗑
|
||||
| show | a technique used to produce a radiographic third dimension
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
jen.