Final Review-Radiologic Technology
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
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| Keeping the last image displayed on the monitor | show 🗑
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| The time it takes for the x-ray tube to be switched off | show 🗑
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| Grouping sets of 4 smaller pixels together to form a larger effective pixel when taking spot films | show 🗑
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| show | ABS
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| show | AGC
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| A series of short visual checks, rather than continuous fluoro, dramatically reduces cumulative exposure to the patient | show 🗑
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| show | veiling glare
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| show | pulsed fluoro
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| Indicates the emission of light | show 🗑
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| show | magnification mode
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| Slight magnification and increased blur around the periphery of the image | show 🗑
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| Loss of brightness toward the periphery of the image | show 🗑
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| show | minification
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| show | Image intesnsifier
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| show | interrogation time
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| T/F Grid cut-off is not an issue in fluoroscopy | show 🗑
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| Primary source of operator radiation exposure during fluoroscopy | show 🗑
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| show | Energy conversion tubes
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| show | Binnning
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| show | Minification
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| show | pulse interval
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| show | multifield intensification
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| show | flux gain
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| show | pulse height
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| show | Pulse width
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| show | High SNR
More FOV
Wide dynamic Range
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| Who invented the fluoroscope | show 🗑
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| show | distance between photocathode and output phosphor is exactly equal
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| show | Input phosphor (circular)
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| show | improved spatial resolution
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| show | intermittent fluoroscopy
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| show | a stronger negative charge is placed on the electrostatic focusing lens
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| show | 30 cm (12 inches)
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| show | Increase in minification gain
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| show | Increased patient exposure
(and more blurring)
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| show | 0.5-5 mA
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| FPD fluoroscopy (3 things) | show 🗑
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| show | fluoroscopic xray tube
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| When utilizing Mag mode 2, what should you except to happen when switching to mode 1 | show 🗑
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| What two things happen with mag mode will increase | show 🗑
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| show | Amplification of electrical signals
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| Product of minification gain and flux gain is calculated to determine | show 🗑
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| show | automatic stabilization control
Automatic gain control
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| placing the tube beneath the patient beneficial | show 🗑
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| Volt potential difference needed to accelerate electrons rom the cathode side to the anode side of I.I. | show 🗑
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| show | DEL
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| Operating the image intensifier tube in the____ mode can help reduce pincushion distortion | show 🗑
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| show | electrons
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| show | True
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| The output phosphor of an I.I. changes _______ energy into ________energy | show 🗑
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| CCD video imaging uses what type of technology | show 🗑
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| T/F Longer frame rates allow less smearing if a fluoroscopic procedure requires panning or sweeping | show 🗑
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| The product of minification gain and flux gain is calculated to determine | show 🗑
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| show | Automatic gain control
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| Placing the x-ray tube beneath the patient.. | show 🗑
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| What is the volt potential difference needed to accelerate electrons from the cathode side to the anode side of an image intensifier | show 🗑
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| show | Detector element (DEL)
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| show | True
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| show | Virtual grid software
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| show | False
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| show | Data clipping
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| Ghost images can be caused by all of these except | show 🗑
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| T/F Sudden deviations in focal spot size indicate damage to the cathode | show 🗑
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| T/F Quality Assurance is for monitoring quality patient care, and QC is about monitoring the quality of our equipment | show 🗑
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| show | Lumens
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| For light emitted isotropically in all directions from a source, one candela generates one lumen of light intensity per meter | show 🗑
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| Spatial Frequency is measured in (three things) | show 🗑
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| "Black Bone" is another way to say the image is | show 🗑
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| CR QC requires beam angulation cannot be off by more than | show 🗑
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| show | 5
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| Post processing technique that is key in displaying C7-T1 junctions is | show 🗑
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| show | the laser scanning lines and the short dimension of the grid lines in perpendicular
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| show | 2 or more images are combined together
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| Size of the projected light field (collimator) must be within plus or minus the x-ray beam | show 🗑
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| show | Edge enhancement
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| On SMPTE test pattern and other test patterns for electronic image display monitors, there are sets of adjacent squares with JNDs in density between them | show 🗑
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| What QC calibration should fall within plus or minus 5% | show 🗑
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| Ever radiographic image must include | show 🗑
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| show | No
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| The use of repeat analysis in a radiographic imaging department provides pertinent direction | show 🗑
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| show | False
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| show | Frequency
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| Stationary Fluoro | show 🗑
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| show | MTF
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| show | Field uniformity
Erasure thoroughness or ghosting
Uneven spatial resolution
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| show | 3-5%
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| show | 10%
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| X= SNR squared of output divided by SNR squared of input | show 🗑
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| <30% from average: consistency of a single brightness level displayed across the area of the display screen | show 🗑
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| +/- 5% The ability to repeat the same overall technique settings and obtain the same results iin actual exposure | show 🗑
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| show | Field uniformity
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| The thickness of absorber material required to reduce the intensity of the x-ray beam to one-half its original value-- 2.5 mm Al or more | show 🗑
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| +/- 10% exposure accuracy linearity that requires a back up time check as a part of its QC | show 🗑
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| show | Slit camera
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| +/- 2% SID can use plexiglass cylinder or 8 pennies to measure accuracy | show 🗑
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| +/- 5%; High voltage diaode or oscilloscope is used to measure accuracy | show 🗑
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| show | exposure timer
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| show | focal spot blooming
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| show | mA linierty
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| show | image display system
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| +/- 2% SID; use a tape measure to measure from the anode (red+) to the imaging plate | show 🗑
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| 10% differences in adjacent squares on SMPTE pattern within 10% accuracy | show 🗑
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| show | Miore and Aliasing
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| The minimum filtration required on an x-ray unit | show 🗑
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| T/F low MTF values like 0.2, meants the image is displaying high spatial resolution/frequency | show 🗑
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| show | an image is flipped right to left or vice versa
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| T/F HVL improves beam quality | show 🗑
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| show | Positioning
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| T/F CR image can avoid alignment issues if 1/4th of the image receptor is exposed | show 🗑
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| Single CR phosphor plate is erased and then processed without exposing it to xrays. This is a test for | show 🗑
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| Device designed to directly measure luminance, or the light intensity emitted from the display monitor | show 🗑
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| show | 15
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| show | Supports tissue equalization
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| show | 8
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| show | Smax
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| Histogram, what does the x-axis represent | show 🗑
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| show | DR
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| show | increase contrast in the image
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| determined by the computer by finding the mid-point between SMIN and SMAX in the main lobe of the generated histogram for the image | show 🗑
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| A marker for exposure quality that porvides the radiographer with an indication of accuracy of their technique | show 🗑
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| Ratio or percentage of original xray beam intensity absorbed by a particular tissue area in the patient | show 🗑
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| show | Rescaling
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| show | Deviation index
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| show | Gray scale
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| Gradual acceptance over time to use higher radiographic exposures, and hence doses to the patient, for the same xray exam and projection | show 🗑
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| show | bit depth
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| Frequency of recorded exposure values recorded by the image receptor | show 🗑
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| Range of exposures that produce quality images at an appropriate patient dose | show 🗑
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| Process of the ADC taking electronic signals and changing them to brightness levels displayed in pixel values | show 🗑
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| Range of exposures that can be captured by the detector | show 🗑
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| Detector elements are responsible for capturing the aerial image and converting x-rays into | show 🗑
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| T/F the more zoom applied to an image the better the spatial resolution is represented | show 🗑
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| The higher the fill factor in the dexel the _____ the spatial resolution | show 🗑
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| T/F using incorrect collimation can create a histogram analysis error | show 🗑
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| Saturation of an image occurs when | show 🗑
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| show | histogram analysis
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| Which device can be used in place of a photomultiplier tube in CR reader | show 🗑
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| show | only exposed dexels
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| T/F the tail lobe on a histogram represent barium or a prosthesis | show 🗑
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| show | Saturation
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| show | decreased window level
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| Element for scintillation | show 🗑
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| show | Amorphous Selenium
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| show | Barium Fluorohalide
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| Element for Indirect Photodiode | show 🗑
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| show | Helium Neon
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| CR or DR Scinitllator | show 🗑
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| show | DR
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| show | CR
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| CR or DR Translation | show 🗑
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| show | CR
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| CR or DR F centers | show 🗑
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| show | CR
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| CR or DR Dexels | show 🗑
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| show | CR
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| show | CR
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| show | 64
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| show | short gray scaled
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| show | xray sensitive portion of the detector
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| show | window width
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| show | with no spikes, only the main lobe
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| What is the role of the PMT-Photomultiplier tube | show 🗑
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| show | Scintillation layer
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| T/F Cesium Iodide is an element utilized in scintillation system for a direct capture DR imaging | show 🗑
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| show | latent image
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| Rad must view images within | show 🗑
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| Device that acts as a switch to release the electric charge collected by the detector element | show 🗑
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| T/F Lossless compression is adequate to sustain high spatial resolution in digital imaging | show 🗑
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| Which device in the image receptor converts light into electrons | show 🗑
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| show | Raster pattern
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| Luminescence refers to a release of | show 🗑
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| What is the initial response of CR phosphors when the phosphor layer of the imaging plate is stimulated by xrays | show 🗑
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| Imaging and archiving systems in radiology communicate using what digital format | show 🗑
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| show | neural
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| What is the bit depth capacity of the human eye | show 🗑
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