In each blank, try to type in the
word that is missing. If you've
typed in the correct word, the
blank will turn green.
If your not sure what answer should be entered, press the space bar and the next missing letter will be displayed. When you are all done, you should look back over all your answers and review the ones in red. These ones in red are the ones which you needed help on. Question: What is the of the Grid?Answer: To improve contrast, To absorb scattered radiation before it reaches
the IR Question: What is responsable for?Answer: the dark of a radiograph Question: What is Absorption for?Answer: the areas of a radiograph Question: What does do to an X-ray?Answer: creates fog and lowers Question: What increases ?Answer: kV , Field size increases, thickness of part increases, atomic number decreases Question: What are the for Grid use?Answer: when the part thickness is more than 10 cm, and when the kV is than 60 Question: Who created , and when?Answer: Dr. Bucky in 1913 Question: What are constructed of?Answer: Radiopaque lead strips that are by radiolucent interspace material, usually Aluminum Question: Who the design of Grids, and how?Answer: Dr. Hollis . He made the grid lines run in the same direction and made them move during exposure. Question: How do you find the Grid ?Answer: Grid = H/D Question: With a high grid ratio, what scale of is there?Answer: short scale of Question: T\F: A higher grid ratio is at removing scatter radiation.Answer: True Question: What is the grid ratio?Answer: 5:1 to 6:1 Question: What is Grid ?Answer: the number of lead strips in the grid per inch or Question: T\F: Lower frequency have thinner lead strips.Answer: False : Higher frequency grids have thinner leas . Question: What type of grid the greatest amount of lead and is most effeciant in absorbing radiation?Answer: High ratio, low grids Question: T\F: As the lead content increases, the removal of scatter decreases, and the decreasesAnswer: False: As the lead increases, removal of scatter increases, and increases. Question: What are some types of grid ?Answer: Crosshatched, linear, Rombic, and . Question: What does a crosshatched look like?Answer: It has both horizontal and vertical lead Question: What does a pattern look like?Answer: lead run the length of the grid in one direction Question: What does a Rombic pattern look like and is it used?Answer: Looks like a wavy pattern and is used in Europe Question: What does a Consentric look like?Answer: A circular pattern that is evergrowing and is used in Japan Question: What type of grid has a higher of error?Answer: the pattern Question: What are the of linear grids?Answer: focused and Question: What do linear grids look like?Answer: the lead strips are angled which matches the beam Question: What is ?Answer: When the lead strips are angled to match the beam Question: What does improper centering on a linear grid in?Answer: Peripheral cut Question: What does a parallel grid look like?Answer: the lead strips are all to one another Question: What is a of using a parallel linear grid?Answer: absorbs a amount of the primary beam. Question: What is reciprocating grid ?Answer: the grid is back and fourth by a motor during exposure. Question: What is grid movement?Answer: a electromagnet that the grid to the side and releases it during exposure. Question: What is the grid conversion ?Answer: GCF = mAs with grid \ mAs without Question: What to the density of a radiograph when a grid is used?Answer: decreases Question: What is the -Bucky diaphragm, and what does it do?Answer: it is the Bucky we use , it moves the grid during exposure. Question: What formula is used when converting from one grid ratio ot ?Answer: mAs of 1 over mAs of 2 = GCF of 1 over GCF of Question: What does the ICRU do?Answer: the International Commission of Units and Measurements evaluate grid performance by two criteria; selectivity and contrast imporvement ability. Question: What does describe?Answer: the ability of the grid to allow the primary radiation to the IR and prevent scatter Question: T\F: high lead content grids are more .Answer: Question: What is the "K" ?Answer: the improvement ability which is a comparison of contrast of an image with a grid to that of an image without a grid Question: What are the typical ranges of the contrast improvement ?Answer: 1.5 an 3.5 Question: When the "K" is increased, what is incrased as well?Answer: Question: What can you do to grid errors?Answer: proper aligmnent between tube and Question: What does improper alignment of the tube and the grid ?Answer: cut Question: What are some types of grid ?Answer: off level, off , off focus, upside down, morie effect Question: What is effect?Answer: the grid lines must be running in the same as the movement of the laser beam that is scanning the imaging plate. Question: What is the Air-Gap ?Answer: places a space between the part and the grid. a 10" gap has the same effect as a 15:1 Question: What happens when the grid is down?Answer: severe peripheral grid cut off will Question: What does it mean when the grid is off ?Answer: the gird has a specified distance as the focal range. if a distance of 44 SID is and a 72" SID is used, the result will be grid cut off on the peripheral edges of the image Question: What does it mean when the grid is off ?Answer: the CR is off and the result is a decrease in exposure across the entire image. Question: What does it mean when the grid is off ?Answer: when the tube is angled, an off level grid error occurs with a focused grid and it is the only positioning error possible with a grid. |
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