By G.J.van der Plaats, P. Vijlbrief
By way of Professor J. H. Middlemiss, division of Radiodiagnosis, The clinical tuition, collage of Bristol This publication, for therefore lengthy and so deservedly, has been a favorite and trustworthy advisor for anyone present process education in diagnostic radiology no matter if that individual be health care professional or technician. This new, mostly re-written version is much more comprehen sive. And but through the ebook simplicity of presentation is maintained. Professor G. J. van der Plaats has been popular to radiologists within the English talking international for greater than 3 many years. He has been, and nonetheless is, revered by way of them for his imaginative and prescient, his thoroughness, selection and meticulous cognizance to aspect and for his unremitting enthusiasm. the normal of radiography within the Netherlands all through this era has been known as being of the best quality, and this has, in no small degree, been because of the trend set by means of Professor van der Plaats and his colleagues.
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Extra info for Medical X-Ray Techniques in Diagnostic Radiology: A Textbook for Radiographers and Radiological Technicians
Example text
5 keV, it increases sharply. 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.
The result was, therefore, undesirable X-radiation from the valve and too weak an X-radiation from the X-ray tube. Therefore, the emission of older types of valves (valve filament current) had to be very carefully adjusted or regulated. ). Later, the so-called 'gas valves' were made based on the principle of the charge-carrying properties of gas ions in the valve. Actually, such a gas valve is an ion tube that operates at a low voltage. These gas valves have also been abandoned. With the introduction of hard-glass X-ray tubes immersed in oil, valves have also been made of hard glass and their dimensions considerably decreased.
In such cases, the anode is made of a particular element, molybdenum for example. 4 keV. In the X-ray beam the characteristic radiation is superimposed on the Bremsspectrum. With a molybdenum tube for mammography, the above-named, fairly long wavelengths are very intense (have a high intensity) causing the mammographs to gain appreciably in contrast. *The terms quantum and photon have the same meaning and both are still being used; for this reason, both terms are used in this book. Photon, however, is gradually replacing quantum.