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High frequency digital X ray equipment

May 01, 2007 · introduction. a systematic historical overview of the evolution of digital radiography is shown in , table 1.experimental digital subtraction angiography was first described in 1977 by kruger et al (, 1) and introduced into clinical use as the first digital imaging system in 1980 (, 2).for general radiography, x-ray images were first recorded digitally with cassette
Apr 14, 2011 · so, if a large patient is imaged on a digital detector through a thick body part, the x-ray technique must be adjusted upward to compensate for x-ray attenuation and to ensure a sufficient number of transmitted x-rays incident on the detector in order to achieve a desired exposure index value. this represents a relatively high dose to the patient.
Microwaves are a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter; with frequencies between 300 mhz (1 m) and 300 ghz (1 mm). different sources define different frequency ranges as microwaves; the above broad definition includes both uhf and ehf (millimeter wave) bands.a more common definition in radio-frequency engineering is
High-definition television (often shortened to high-definition and hd or high definition) describes a television system providing an image resolution of substantially higher resolution than the previous generation of technology. the term has been used since 1936, but in modern times refers to the generation following standard-definition television (sdtv), often abbreviated to

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