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| projectional radiography ： ウィキペディア英語版 |
projectional radiography
Projectional radiography or diagnostic radiography is the practice of producing two-dimensional images using x-ray radiation. Radiographic exams are typically performed by Radiographers. Radiographers are trained, licesned medical professionals who specialize in the usage of radiographic positioning, patient care, selection of technical factors, radiographic equipment, and radiation safety. Projectional radiography is the cornerstone of modern medical imaging, and can be used to image almost every part of the human body. Mammography, DXA and dental radiography are specialized variants of projectional radiography. Computed tomography also uses x-radiation, but its different image acquisition parameters allow for images to be acquired in the axial plane.
== Imaging principles ==
Projectional radiography relies on the characteristics of x-ray radiation (''quantity'' and ''quality'' of the beam) and knowledge of how it interacts with human tissue to create diagnostic images. X-rays are a form of ionizing radiation, meaning it has sufficient energy to potentially remove electrons from an atom, thus giving it a charge and making it an ‘ion’. Ionizing radiation has sufficient energy to penetrate human tissue.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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