Ch. 18-23, 25, 26
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | lumen
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| A digital display monitor is best viewed | show 🗑
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| A liquid crystal is a material in a state between a liquid and a | show 🗑
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| Almost all digital images in medical imaging are viewed and interpreted on a | show 🗑
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| Medical flat panel display devices are _______ liquid crystal displays. | show 🗑
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| Medical flat panel display devices are identified by the number of | show 🗑
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| Compared to CRT's, AMLCD's have better _____ and less intrinsic _______ | show 🗑
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| The ambient light at a digital image workstation should be near | show 🗑
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| show | automatically; manually
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| Flatfielding is accomplished through automatic calibration images called ____ and ____ images. | show 🗑
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| Reregistering an image to correct for patient motion is done with | show 🗑
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| show | preprocessing
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| The national standard for image transmission in teleradiology is the | show 🗑
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| Image field size is determined by | show 🗑
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| A screen film radiographic artifact is any irregularity on an image that is not caused by the proper imaging or tissue by primary | show 🗑
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| show | exposure artifacts
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| show | processor artifact
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| show | exposure artifacts
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| show | guide shoe marks
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| Thin lines on the leading or trailing edge of a film are | show 🗑
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| Only patients can cause image | show 🗑
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| show | bending the film
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| A quality assurance program monitors | show 🗑
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| show | equipment
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| show | outcome analysis
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| show | assurance
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| What does JCAHO mean | show 🗑
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| show | ensure quality patient care, receive payment, JCAHO approval
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| Most quality control testing on radiographic equipment is done | show 🗑
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| show | half value layer measurements
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| The collimator must be accurately aligned to within + or - | show 🗑
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| The measure of kVp should be within + or - ___ of the kVp indicated on the console. | show 🗑
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| show | collimation
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| show | erasure
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| _____ is done during preprocessing to correct for _____ over the image | show 🗑
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| ___ is done during the imaging, flatfielding is done during the preprocessing, and lossless compression is done during post processing | show 🗑
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| CR cassettes can sit for a few _____ between exposures. | show 🗑
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| Lossless compression reduces data files by a ratio of | show 🗑
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| Lossy compression reduces data by a ratio of | show 🗑
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| show | uncompressed images
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| show | histogram
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| Medical images are transferred using the | show 🗑
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| Soft tissue radiography is unique because of the | show 🗑
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| show | enhanced
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| Breast tissue tends to be increasingly ___ in older women | show 🗑
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| About ___ of breast cancer occurs in the ductal tissue | show 🗑
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| The American Cancer Society recommends all women ___ years of age and above have an annual screening mammogram | show 🗑
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| The ACS recommends biannual screening for all women age | show 🗑
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| A dedicated mammography unit should have an automatic | show 🗑
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| Every dedicated mammography unit is equipped with a | show 🗑
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| show | patient does, motion blur, and superimposition
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| show | reduce focal spot blur
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| Cassettes used in mammography are designed with tighter | show 🗑
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| show | 5 mA
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| The image intensifier improved fluoroscopy by increasing image | show 🗑
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| Visual acuity in the eye is greater at the fovea centralis where | show 🗑
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| show | contrast perception
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| The rods in the retina are stimulated by ___ light; the cones are stimulated by _____ light. | show 🗑
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| show | input phospher
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| show | light; cesium iodide
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| The number of light photons emitted within the image intensifier is directly proportional to the amount of xray photons | show 🗑
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| Light produced at the output phosphor has been increased | show 🗑
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| show | flux gain
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| show | brightness gain
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| show | input phosphor
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| show | 80 to 90 kVp
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| Viewing the fluoroscopy image in magnification mode increase | show 🗑
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| show | kVp and mAs
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| Digital fluoroscopy uses at least | show 🗑
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| The time it takes to turn on the digital fluoroscopy xray tube and reach the selected mA and kVp is the | show 🗑
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| The charged coupled devise used in digital fluoroscopy provides | show 🗑
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| Digital fluoroscopy dose rate is lower than that for continuous analog fluoroscopy because the images are | show 🗑
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