ARRT registry review covering image production and evaluation
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| recorded detail is? | show 🗑
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| show | inversely, as magnification decreases recorded detail will increase. p.299
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| show | as SID increases the magnification from divergent ray will decrease and recorded detail will increase, they are directly related p.299
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| show | elongated or foreshortened p.302
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| show | the smaller the focal spot size the better the recorded detail p.303
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| actual focal spot verses effective focal spot? | show 🗑
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| how does the angle of the anode effect the x ray? | show 🗑
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| show | motion p304
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| show | fluorescent phosphor that functions to change x ray photons into light, more than 98% of the exposure is from the fluorescent light.p.309
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| recorded detail increases as: | show 🗑
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| show | when any mA and time (second) produces a given mAs p.318
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| show | device place between the patient and the image receptor that absorbs a large percentage of scatter radiation before it reaches the IR, it works by having lead strips in the same direction of the x ray photons, so those that opposing will be absorbed
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| Grid ratios? | show 🗑
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| what is the total filtration of x ray tubes that operate above 70 kvp? | show 🗑
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| show | INCREASE: ascites, RA, paget disease, pneumonia,atelecxtasis, CHF,edematous tissue DECREASE: osteoporosis, osteomalacia, pneumopeitoneum,emphysema,, degenerative arthritis,atrophic and necrotic conditions
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| show | single phase-100% three phase 6 pulse-13% three phase 12 pulse-4% high voltage-
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| show | High contrast: short-scale contrast, displays few number of grays and tissue difference, product of low kv LOW CONTRAST: long scale, displays many similar tissue differences, product of a high kv
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| subject contrast? | show 🗑
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| show | extremities-55 GRID- skull-75 abdomen-75 lateral lumbar-90 barium studies-120 chest -120
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| show | SNR is used to describe contrast resolution, the higher the SNR the better the resolution, SNR increases as mAs increase however so does patient dose p.364
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| show | as matrix size increases, pixel size smaller,and better spatial resolution
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| show | developer, fixer, wash, and dryer
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| show | developer- reduces exposed silver bromide to black metallic silver fixer- clears the film of unexposed silver bromide and rehardens the emulsion, wash- removes processing chemicals dryer- rfemoves water from film and dries emulsion
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| what is DQE | show 🗑
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| show | phototimer and ionization chamber
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| where are the AEC at? | show 🗑
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| show | higher contrast (short scale) because more scatter is absorbed
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| structures that high higher subject contrast have what type of gray scale? | show 🗑
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| show | energy of the x-ray photons and therefore the degree of penetration of various tissues thereby determining the contrast characteristics of the image.
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| show | field size, beam restriction, kvp, thickness or volume and density of tissue
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