Download Medical X-Ray Techniques in Diagnostic Radiology by G.J.van der Plaats, P. Vijlbrief PDF

By G.J.van der Plaats, P. Vijlbrief

by Professor J. H. Middlemiss, division of Radiodiagnosis, The scientific tuition, collage of Bristol This ebook, for thus lengthy and so deservedly, has been a favorite and trustworthy consultant for any individual present process education in diagnostic radiology even if that individual be health care professional or technician. This new, mostly re-written variation is much more comprehen­ sive. And but during the ebook simplicity of presentation is maintained. Professor G. J. van der Plaats has been popular to radiologists within the English­ conversing global for greater than 3 many years. He has been, and nonetheless is, revered by way of them for his imaginative and prescient, his thoroughness, decision and meticulous cognizance to element and for his unremitting enthusiasm. the traditional of radiography within the Netherlands all through this era has been regarded as being of the very best quality, and this has, in no small degree, been a result of trend set through Professor van der Plaats and his colleagues.

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Extra resources for Medical X-Ray Techniques in Diagnostic Radiology

Sample text

06 nm (20 keY) attenuation due to absorption accounts for 70 per cent and that due to scatter 30 per cent. 4 ke V) attenuation due to absorption is more than 90 per cent. These figures are valid for monochromatic radiation. However, in practice X-ray beams produced in X-ray tubes consist of radiation composed of a great number of wavelengths (that form the continuous spectrum). In order to apply the figures to such beams, one must take as the average hardness of the beam the one that corresponds to a third of the highest (peak) voltage, that is kVp:3.

See text. 46 Medical X-ray Techniques edge. This raised absorption is called selective absorption. However, the voltages at which selective absorption arises for the elements that make up the human body are so low that selective absorption is insignificant in practice. ). Experiments attempting to make use of selective absorption in diagnostic examinations have not so far been successful. On the other hand, this selective absorption in materials which contain silver, tungsten, zinc, etc. (as in photographic emulsions of films and intensifying screens) is of marked importance.

A fixed or adjustable diaphragm (made of lead) is used to limit further the size of the beam emerging from the tube window, as desired. Naturally, if the anode angle is made even smaller (for example 10°) the useful beam cross-section is reduced further, and is now only suitable for spot films (of certain details) at usually a relatively short focusfilm distance. When the focus is situated at the end of a rod one can theoretically use an angie greater than 180°. In practice, however, this leads to difficulties.

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