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Image acquisition and evaluation review

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
show amount of blackness on a given area of a radiograph  
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show quantity of xrays produced  
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kVp controls what?   show
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Contrast   show
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density may be defined as:   show
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show exit rays striking the image receptor  
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show mAs and window level  
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show density is directly proportional to mAs  
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show mAs  
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the law stating that any combinations of mA and time that produce the same mAs value will produce the same radiographic density is the:   show
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show PSP  
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the primary controlling factors of contrast are:   show
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the relationship between kVp and density may be described as:   show
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the 15% rule states that:   show
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what governs the relationship between SID and density?   show
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show density is reduced to one-fourth  
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show reduce mAs to one-fourth its original value  
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show Long OID, Large focal spot, patient motion, magnification  
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show high-resolution monitor capable of displaying millions of pixels  
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a primary advantage to digital fluoroscopy is:   show
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which of the following describes the relationship between radiographic density and the use of grids?   show
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the use of filtration:   show
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show density decrease  
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show anode heel effect  
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the thicker part of anatomy should be placed under which aspect of the xray tube?   show
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show make detail visible  
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a radiograph with few gray tones, primarily exhibiting black and white, would be described as having what type of contrast?   show
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poorer recorded detail may be caused by which of the following factors?   show
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show low contrast, long scale, many gray tones  
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low kVp produces which of the following?   show
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show high  
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show photoelectric interaction  
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show increase contrast because of reduction in the number of compton interactions that occur  
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the adjustment in technical factors required when using beam restriction is:   show
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show increase contrast  
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as the amount of beam filtration is increased:   show
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the portion of contrast that is caused by variations in the anatomy or is secondary to pathological changes is called:   show
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show geometric representation of the part being radiographed  
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show long SID, short OID, small focal spot  
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optimal recorded detail may be created using what?   show
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show shape distortion  
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show short SID, long OID  
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distortion that occurs when the xray beam is angled against the long axis of a part is:   show
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distortion that occurs when the xray beam is angled along the long axis of a part is:   show
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the actual patient dose as measured by a meter embedded in the collimator is:   show
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show every 3 months  
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quality assurance and maintenance of CR cassettes includes erasing plates at least:   show
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show image appearance consistency  
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a software function that evens the brightness displayed in the image called:   show
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show the latitude of collimation that still allows the software to detect collimated edges  
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show increasing kVp  
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show scatter and background radiation  
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show histogram analysis error  
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show edge enhancement  
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as speed class increases:   show
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smoothing software may result in:   show
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show degrade visibility of anatomy  
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a high SNR provides an image with:   show
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show detail  
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grid ratio is defined as:   show
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grid frequency is defined as:   show
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show focused grid  
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show grid radius  
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show crosshatch grids  
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show decreased density on a radiograph as a result of absorption of image forming rays  
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use of the air gap technique:   show
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materials that make flat panel detectors possible are:   show
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Which of the following maintains image brightness over a wide range of exposures?   show
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show bit depth  
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the smallest exposure change able to be captured by a detector is called:   show
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show dose area product  
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show detector size  
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show detector element  
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what allows more anatomical structures to be captured during an exposure?   show
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the range of receptor exposures that provides a quality image is called:   show
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which of the following is a graphical representation of pixel values?   show
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undesirable fluctuations in brightness are called:   show
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the number of pixels making up the digital image is the:   show
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show modulation transfer function (MTF)  
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which of the following terms describes the highest spatial frequency that can be recorded by a digital detector?   show
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what converts light into a charge?   show
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the smallest area represented in a digital image is the:   show
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show pixel density  
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the space from the center of a pixel to the center of the adjacent pixel is called:   show
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show quantization  
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a material that absorbs xray energy and emits part of that energy as visible light is called:   show
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bit depth is equal to:   show
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receptor exposure   show
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show to see a difference in density, the mAs must change at least 30%  
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filtration effect on contrast?   show
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collimation effect on contrast?   show
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show lines pairs per millimeter (lp/mm)  
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what technical factors should be used for wet plaster casts?   show
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show increase 10 kVp  
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what technical factors should be used for fiberglass cast?   show
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show not over 70 kVp  
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what technical factors should be used for barium contrast?   show
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whats the order of film development?   show
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where do most processor problems with film occur?   show
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what temperature should the developer be?   show
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the faster the speed of the screen?   show
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where is the micro switch located that controls replenishment   show
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collimation effect on density?   show
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show 36"  
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does mAs go up or down for a higher grid ratio?   show
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show increase mAs=increase density  
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show increase kVp=increase density  
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show increase SID=decrease density  
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grid ratio effect on density?   show
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show increase filitration=decrease density  
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show increase anode heel effect=decrease density  
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show increase factors=decrease density  
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kVp effect on contrast?   show
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show increase OID=increase contrast  
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show increase grid ratio=increase contrast  
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patient factors on contrast?   show
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