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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Additional info for Electrocardiografia Practica
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).