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Stack #738467
| Questionscatter radiation | Answer |
|---|---|
| scatter radiation is most easily controlled by? in reference to technologist's control | most easily controlled using collimation and a grid |
| which is not a way to reduce the production of scatter radiation? a.reduce the exposure field size b. reduce tissue thickness c.increase the grid ratio d. ask a patient with large abdomen lie prone insetad of supine. | increase the grid ratio |
| what purpose does positive beam limitation serve? | reduce patient exposure by limiting the exposure field to the same size as the image receptor in the bucky |
| What occurs when scatter radiation strikes the film? | contrast is decreased |
| if the height of the lead strip increases and the space between the grid strips decreasses, will the grid be more or less effective in removing scatter? | more effective |
| what would be the most difficult grid to use? | low ratio paralell linear grid |
| which beam restriction device can be cut to the size needed? | an apertire diaphragm |
| what is the result of imaging a thicker part or patient? | more compton interaction |
| the amount of mAs required with a grid divided by the amount of mAs needed without a grid is the calculation that determines the (2 answers) | grid conversion factor and the bucky factor |
| which grid design is manufactured to match the divergence of the x-ray beam? | focused grid |
| what occurs when the x-ray beam is not properly aligned with the grid strips? | grid cut-off |
| what type of grid error is seen as a loss of density at the periphery of the image? | off-focus |
| why does the air gap technique work? | the scatter photons are more likely to miss the image receptor |
| also called lateral decentering, the _____ grid error results when the central ray is not aligned to the middle of a focused grid? | off-center |
| the use of a compression device will increase | contrast |
| the use of ___ improves contrast and reduces patient dose. | collimation |
| the positive beam limitation device assures that the xray beam is collimated to _____ | i cm inside the receptor size |
| how can you improve image contrast with a heavy patient without increasing patient dose? | lower kVp, higher mAs, use tighter collimation |
| the greatest source of scatter during a readiographic exam is the _____ | tube |
| the purpose of a moving grid is to blur___ | unwanted density |
| as compton scatter increases, contrast____ | decreases |
Created by:
b.xray