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RADT 312 Final
| Question | Answer |
|---|---|
| With the I.I., upon absorbing light energy, a photocathode emits: | electrons |
| In the I.I. tube, the reduction of brightness at the periphery of the output screen is referred to as | vignetting |
| For surgery cases, which type of table significantly reduces skin entrance exposure to the patient | carbon fiber |
| the conventional fluoroscopic unit usually operates at about ____ mA | 1 to 5 |
| quantum mottle shows up on the fluoroscopic TV monitor as | scintillation |
| What is Ceiszynski's Law of Isometry | split the difference between two angles to minimize distortion |
| What position can be used to look at air fluid levels in an abdomen | left lateral decub |
| what is the process of the I.I. from start to finish | xray -> light -> electrons -> light |
| the input phosphor absorbs xrays and re-emits energy as | light |
| increasing magnification mode on an I.I. _________ spatial resolution and __________ patient dose | increases, increases |
| The Potter-Bucky moving grid was developed to eliminate | visible grid lines |
| the spaces between the lead strips of a physical grid are called | interspaces |
| the production of scatter radiation is most dramatically affected by the | amount of tissue exposed |
| the height of the lead strips compared to the distance between the lead strips is the definition of | grid ratio |
| the primary purpose of the use of grids is to | reduce scatter before it reaches the IR |
| moves the grid plate in a circular pattern during exposure | oscillating Potter-Bucky |
| moves the grid plate back and forth in a linear movement during exposure | reciprocating Potter-Bucky |
| what is the most reliable in determining the effectiveness of a physical grid | grid ratio |
| the use of a physical grid will ______ subject contrast, but _________ patient dose | improve, increase |
| physical grids should be used when the kVp has to be set above | 70 kVp |
| all xray machines that can operate above 70 kVp, the required minimum amount of total filtration for the xray tube is | 2.5 mm of aluminum |
| when using wedge-shaped compensating filter, the tech would always place the thicker portion of the filter | toward the thinnest anatomy |
| what feature suppresses image mottle with a slight decrease in contrast throughout the image | smoothing |
| no overexposed digital image should ever be repeated, no matter the EI, unless _____ has occurred | saturation |
| for static xray images, spatial resolution frequency should be at least | 8 LP/mm |
| for digital fluoroscopy, spatial resolution frequency should be at least | 6 LP/mm |
| beam-part-receptor alignment is the primary control for image | shape distortion |
| false images can be created by | motion |
| spatial frequency is measured in | LP/mm |
| T/F: an unprocessed image is called a latent image | true |
| what is NOT one way to reduce patient dose | placing the I.I. under the patient |
| a grid should be used | for anatomy that is 10cm in thickness or greater |
| T/F: half-value layer (HVL) is a means in which the degree of penetration of an xray beam is measured | true |
| T/F: the main purpose of filtration is to protect the patient's body from the excess radiation | true |
| which would produce the most scattered radiation | a patient with a large abdomen |
| if we are only changing our field size, which field size would create the largest degree of scattered radiation | an 8" x 8" field size |
| the purpose of a compensating filter is to | make the receptor exposure more uniform |
| what is the best method for a radiographer to control scatter radiation | collimation |
| adding more filtration would have what effect on the average energy of the photons in the xray beam | increase the average energy |
| adding additional filtration would have what effect on the quantity of the photons in the xray beam | decrease the quantity of photons |
| the ability to distinguish adjacent details as being separate and distinct is the definition of | resolution |
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