14150636
Description
Flashcards by Elizabeth Then, updated more than 1 year ago
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Created by Elizabeth Then
almost 6 years ago
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| Question | Answer |
| X-ray basics | skill of radiographer dictated quality of image |
| Five radiographic image quality characteristics | dictates image quality geometry, artifacts, blur, contract sensitivity, noise |
| contrast sensitivity | determines what tissues and body structures are visible in a radiograph many factors that have affect on contrast sensitivity are: anatomical environment, spectrum, scatter, film |
| total attenuation | gradual loss of intensity through a medium determined by photoelectric and compton interactions decreases with increased photon energy, because energy is dependent on photoelectric effect |
| x-ray image is formed by | different attenuations of x-ray beams within a patient's body. objects with increased attenuation produce shadows |
| penetration | degree to which x-rays have passed through the body |
| penetration | increased penetration through an object decreased contrast, and increased penetration through total body decreases radiation dose to the patient |
| changing kv | principle control of contrast in radiography |
| the x-ray image | is the form of a shadow from the patient's body |
| what makes an x-ray readbale | image artifacts target view bones soft tissue vessels patient factors |
| chest x-ray- consolidation | pathologic process that fills alveoli with fluid, blood, pus, resulting in lobar, diffuse mulitfocal ill-defined opacities |
| chest -x-ray interstitial | involvement of supporting tissue of lung parenchyma, resulting in fine or coarse reticular opacities or small nodules |
| chest x-ray nodule or mass | any space occupying lesion either solitary or multiple |
| atelectasis | collapse of part of the lung, due to decrease in amount of sir in alveoli, resulting in volume loss and increased density |
| limitations of chest radiography | some conditions are not detected on conventional chest x- ray, e.g. small cancers, blood clot such as pulmonary embolism further imaging studies: MRI CT PET US |
| xray risk/benefit analysis | benefits: no radiation remain in patients body, no side effects, inexpensive, fast, useful in emergency risks: slight chance of cancer from excessive exposure, women should inform if they are pregnant |
| nursing considerations | patient protection, staff protection, positioning, optimal image in shortest exposure time |
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