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EXAM 1 DENSITY

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 The degree of blackening on an image.  
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What determines density on an image?   show
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What causes absorption of radiation on the film?   show
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What affects the quality of a radiograph?   show
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What beam factors control the density produced on am image?   show
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show Increase. It is a directly proportional relationship.  
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With an increase in mAs, density produced on the image will   show
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The mAs reciprocity law shows that any combination of mA and time (s) resulting in an equal mAs will   show
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show 30%  
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To cause a visible change in a KUB shot at 40 mAs, the new mas must be increased by 30% what would the new technique be?   show
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show cut the mAs in half  
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show double the mAs  
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Some things that influence density are   show
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What is kVp?   show
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In what way does kVp effect density of film   show
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What is the 15% rule?   show
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show Divergence of the beam affects intensity or the quantity of photons reaching the IR. The relationship is not exactly quantifiable.  
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As SID increases density will   show
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As SID decreased density will   show
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Anode-Heel Effect will affect density due to   show
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To utilize the Anode-Heel Effect and create uniform density of an image, the larker thicker part of the anatomy should be positioned under the   show
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For a chest exam the cathode side of the tube should be positioned over what area?   show
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show The elbow due to more dense tissue that that of the wrist  
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show The hip because of the increased density of the pelvis versus the knee  
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show The knee because it is much denser tissue that the ankle joint.  
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show The Lower Tspine, or the Abdomen because of increased density of the abdominal tissue.  
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show It affects the total number of photons available in the area or field size  
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show increased scatter and an INCREASE in density evident on the film  
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show decreased scatter and a DECREASE in density evident on the film  
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Filtration by the addition of an aluminum filter is used to reduce exposure to what   show
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show it absorbs lower-energy photons or "soft" radiation and "hardens" the beam  
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As filtration is INCREASED and the beam becomes more penetrating but beam quantity is reduced   show
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show density will INCREASE  
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Film-Screen combination can affect density because   show
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show Screen speed exerts a greater effect on image density that film speed.  
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show LESS exposure  
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How efficiently screens convert xray photons into light photons, or "Flourescence" is   show
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show The TYPE of phosphor The SIZE of phosphor THICKNESS of phosphor CONCENTRATION of the phosphor  
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show RARE EARTH materials such as gadolinium and lanthanum  
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show the FASTER it will record the information  
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show the FASTER it will capture the information  
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show the FASTER it will be  
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show Represents the overall speed of a film-screen system  
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A Routine high speed system would have a number of   show
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An extremely slow system would have a number of   show
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As RS is INCREASED   show
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show Density will also DECREASE  
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show help prevent scatter radiation from reaching the IR and also absorb some primary (remnant) photons  
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show MORE patient exposure (Increase in mAs) than non-grid exams  
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Increased grid RATIO or FREQUENCY results in   show
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show Density will DECREASE  
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As grid RATIO/FREQUENCY is DECREASED, thus more radiation reaches the IR 6:1 grid less scatter absorbed   show
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Grid Ratio is determined by the   show
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Grid Frequency is determined by the number   show
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show The Anatomical Part imaged Pathology Attenuation of Photons (absorbed, scattered, transmitted) The Tissue thickness The type of tissue irradiated  
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Thicker body parts absorb   show
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Thinner body parts absorb   show
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As tissue thickness is INCREASED i.e>wrist v.s. knee   show
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As tissue thickness is DECREASED i.e.>shoulder v.s. ankle   show
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show ATOMIC number  
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Gas in the body has an atomic number or   show
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show 6-7  
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show 7-8  
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show 14  
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show image density will DECREASE, highly dense body tissue absorbs more photons  
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As tissue density is DECREASED   show
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Casts require an increase in exposure (mAs, and or kVp)   show
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Destructive diseases may cause a   show
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show DECREASE in tissue density and require a REDUCTION in mAs and kVp  
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show INCREASE in tissue density and require an INCREASE in mAs and kVp  
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show DECREASED density  
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show INCREASED density  
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show DECREASED density  
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show INCREASED density  
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