By G.J.van der Plaats, P. Vijlbrief
Via Professor J. H. Middlemiss, division of Radiodiagnosis, The clinical tuition, college of Bristol This booklet, for therefore lengthy and so deservedly, has been a favorite and trustworthy advisor for anybody present process education in diagnostic radiology no matter if that individual be health care provider or technician. This new, mostly re-written version is much more comprehen sive. And but in the course of the booklet simplicity of presentation is maintained. Professor G. J. van der Plaats has been renowned 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, choice and meticulous recognition to element and for his unremitting enthusiasm. the traditional of radiography within the Netherlands all through this era has been recognized as being of the very best quality, and this has, in no small degree, been as a result trend set by way of Professor van der Plaats and his colleagues.
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Additional resources for Medical X-Ray Techniques in Diagnostic Radiology: A Textbook for Radiographers and Radiological Technicians
Electrons. 2 Photoelectric effect (true absorption). The X-ray photon of frequency v and energy hv liberates the electron from its shell. For this an energy equal to hv 0 is required. The residual energy (hv - hv 0 ) is transferred to the photoelectron. The vacancies in the orbits, caused by this process, are almost immediately filled by electrons from the outer orbits or by electrons coming from outside the atom. Energy liberated in this manner causes the characteristic radiation. , electrons) and the production of characteristic radiation.
45 Formation and Properties of X-rays This fact is expressed by the attenuation coefficient (p). By the attenuation coefficient is meant the number which indicates the proportion of the radiation that 'disappears', that is, is absorbed, or scattered, in a I em thickness. One can express attenuation by an exponential function. 71 ). Strictly speaking, the attenuation formula applies only to monochromatic radiations, but in practice it is also applicable to heterogeneous radiations (actually, for every wavelength, a separate formula is valid, that is each with a different p).
To simplify the calculation, the attenuation due to scatter is ignored, and it is assumed that the entire attenuation is caused by photoelectric absorption. 3 Attenuation depends upon the thickness of the medium The thicker the layer through which the X-rays have to travel, the greater the attenuation to which they are subjected in this layer. When an X-ray beam undergoes 50 per cent attenuation by a I em layer of a substance, it does not follow that the next I em layer of that material will absorb the remaining radiation entirely.
Medical X-Ray Techniques in Diagnostic Radiology: A Textbook for Radiographers and Radiological Technicians by G.J.van der Plaats, P. Vijlbrief