RT131 Rad-Physics - Fluoro Exam 2 Study Guide (RTBC QUESTIONS WITH ANSWERS)

RT131 Rad-Physics - Fluoro Exam 2 Study Guide (RTBC ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




QUESTIONS WITH ANSWERS) ||\\|//|| ||\\|//||




Terms in this set (110) ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Original

In fluoroscopy, the function of the image intensifier is to:
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Brighten the fluoroscopic image ||\\|//|| ||\\|//|| ||\\|//||




Which two of the following are components of the image intensifier? (Select two)
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Input phosphor ||\\|//||




Photocathode




What is the role of the anti-scatter grid in the image intensifier?
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Increase image contrast ||\\|//|| ||\\|//||




What is the purpose of electrostatic focusing lenses within an image intensifier?
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Funnel the photoelectrons into a concentrated stream ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




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,What is the final image intensifier energy conversion that occurs before the visualization of
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the image on a monitor?
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Analog signal to a digital signal ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Which of the following components collects light photons from the output phosphor and
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converts them to electrons? ||\\|//|| ||\\|//|| ||\\|//||




Charge-coupled device (CCD) ||\\|//|| ||\\|//||




Which of the following is the first order of events when operating an image intensifier?
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X-rays strike the input phosphor ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




What is the voltage difference between the photocathode and anode assembly in an image
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intensifier?

25,000 - 30,000 volts ||\\|//|| ||\\|//|| ||\\|//||




Using a grid in fluoroscopy will increase which of the following? (Select two)
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Image quality ||\\|//||




Patient dose ||\\|//||




When using an image intensifier in fluoroscopic imaging, where is the grid located?
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In front of the input phosphor
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, Which of the following is accurate regarding grids used in fluoroscopic imaging?
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Fluoroscopic imaging grids have a lower grid ratio than radiographic imaging grids ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




What type of grid orientation is often found in conventional fluoroscopic grids?
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Linear




In order to decrease patient dose while performing a fluoroscopic procedure on a pediatric
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patient, the operator should: ||\\|//|| ||\\|//|| ||\\|//||




When performing a fluoroscopic procedure on an adult patient, the operator notes
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decreased image contrast due to high scatter production. Which of the following steps ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




would improve the image contrast? ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Add on a grid ||\\|//|| ||\\|//|| ||\\|//||




Crossed grids in fluoroscopic imaging are: (Select two) ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//|| ||\\|//||




Often used in interventional fluoroscopy
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Two sets of lead strips orientated 90 degrees from one another
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Lower ratio grids can be utilized in conventional fluoroscopy because of the:
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Lower milliamperage (mA) values ||\\|//|| ||\\|//|| ||\\|//||