Medical X-Ray Techniques in Diagnostic Radiology: A Textbook by G.J.van der Plaats, P. Vijlbrief

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

By way of Professor J. H. Middlemiss, division of Radiodiagnosis, The clinical institution, college of Bristol This ebook, for thus lengthy and so deservedly, has been a favorite and trustworthy consultant for anyone present process education in diagnostic radiology even if that individual be health practitioner or technician. This new, mostly re-written variation is much more comprehen­ sive. And but during the booklet 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, decision and meticulous awareness to element and for his unremitting enthusiasm. the normal of radiography within the Netherlands all through this era has been acknowledged as being of the very best quality, and this has, in no small degree, been as a result of trend set by way of Professor van der Plaats and his colleagues.

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This allows the distance between tube and shield to be less than when air is used as the insulator. This means that oil-insulated tubes are less bulky than air-insulated ones. A further advantage is that the oil, which entirely surrounds the tube, also serves as a cooling agent. Let us now take a closer look at the cooling of these oil-insulated rotating anode tubes. During 'heavy' exposure, the anode becomes very hot and even glows due to heat dissipation from the focus to the rest of the anode.

_ - ). 1 X-ray spectrum and radiation intensity for the various wavelengths at different kilovoltages. The ordinate represents the intensity I (in arbitrary units) and the abscissa wavelength (in nm and in A). The area enclosed by the curve and the abscissa represents the total intensity. For 40 kV this is the shaded area. The sharp increase of intensity at a higher kilovoltage is clearly visible as well as the abrupt end of the curve at i\min. It can be seen that the intensity shifts towards the shorter wavelengths with increasing kilovo1tage and i\j also shifts in this direction.

One could also say that there are no radiation contrasts in the emergent beam. The situation is quite different, however, when the penetrated object is of heterogeneous composition and consists, for example, of materials that attenuate the radiation in varying degrees. Therefore, a piece of lead in a body will absorb the incident radiation almost entirely and the radiation intensity remaining, after emerging from the lead, is almost zero. If another part of the body causes very little attenuation, then the intensity of the emerging radiation is high.

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