Electrocardiografia Practica by Dale Dubin, Dubin, Roberto Folch Fabre

By Dale Dubin, Dubin, Roberto Folch Fabre

Este libro se presenta como un curso programado rápido. Guía básica para l. a. interpretación de electrocadiogramas. Ejercicios prácticos de autoevaluación.

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Many electrons do not give up their energy until relatively deep into the target material (when they approach close enough to a nucleus). If we consider the two possible directions of emission of an x-ray photon from point A in the anode, it is clear that the path lengths through the anode material will be different for each possibility. This difference in exit paths for a large proportion of photons results in the so-called heel effect: the beam is of lower intensity as one moves across x-ray the beam, along the direction of electron travel.

2%. So, we find that while the intrinsic x-ray contrast is quite large between bone and soft tissue, it is weak between tissue and blood. To visualise vessels, we could use a contrast agent (such as an iodine compound), but this is mildly invasive. Potentially, we can also improve the image contrast by careful selection of a film characteristic. Let us look at another related problem of planar x-ray technology. 6: Depth Collapse problem. First, let us assume that volume V1 has attenuation coefficient μ1 and that volume V2 has attenuation coefficient μ2 .

14, and denoted by Hc (ω).

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