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EOS is a medical imaging system designed to provide frontal and lateral radiography images, while limiting the X-ray dose absorbed by the patient in a sitting or standing position. The system relies on the high sensitivity of a detector ( multi-wire chamber ) invented by Georges Charpak , which earned him the 1992 Nobel Prize .
The ALARA principle (As Low As Reasonably Achievable) represents a movement to “minimize radiation doses and releases of radioactive materials” by minimizing the time of exposure to radiation, increasing the distance between the human body and the radiation source, and using absorber materials to shield the body from beta particles, X-rays ...
CT scans provide in general more information about the anatomy and diseases in the body but could be replaced for some orthopedic indications by other low-dose imaging modalities like EOS. [1] To do this, though, they may expose a person to 100 to 250 times the radiation dose compared to a chest x-ray. [2]
Thus, a copper X-ray source with a nickel filter can produce a nearly monochromatic X-ray beam with photons of mostly 154 pm. For medical purposes, X-ray filters are used to selectively attenuate, or block out, low-energy rays during x-ray imaging (radiography). Low energy x-rays (less than 30 keV) contribute little to the resultant image as ...
In this sense the DQE describes how effectively an imaging system captures the information content available in an x-ray image relative to an ideal detector. This is critically important in x-ray medical imaging as it tells us that radiation exposures to patients can only be kept as low as possible if the DQE is made as close to unity as possible.
Chest X-ray: 0.1 mSv: 10 days Heart: Coronary CT angiography: 12 mSv: 4 years Coronary CT calcium scan: 3 mSv: 1 year Abdominal: CT of abdomen and pelvis: 10 mSv: 3 years CT of abdomen and pelvis, low dose protocol: 3 mSv [2] 1 year CT of abdomen and pelvis, with + without radiocontrast: 20 mSv: 7 years CT Colonography: 6 mSv: 2 years ...