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Applied measurement techniques Appunti scolastici Premium

Appunti del corso di "Applied measurement techniques", tenuto dal Prof. L.Scalise, a.a. 2016-2017, dal nuovo corso di laurea tenuto interamente in lingua inglese in "Biomedical Engineering", UNIVPM. Appunti basati su appunti personali del publisher presi alle lezioni del prof.

Esame di Applied measurement techniques docente Prof. L. Scalise

Anteprima

ESTRATTO DOCUMENTO

since the procedure consisted of pointing, waiting for echo, accomplishing an angular displacement,

stabilizing, and then reiterating again this procedure for each acquisition. At the actual state of the art

sequential linear arrays are the most common, because they produce squared images, and phased array

transducer like the convex one in which the hundred and more transducers are used to explore left and right

without any mechanical means. In fact, with a specifically designed electronics, it is possible to tilt the

pointing beam.

The ultrasound imaging is based on pulsing US which has several advantages. Firstly, it is impossible to detect

clearly an echoed wave if the piezoelectric element continuously oscillates under the action of a continuous

periodic voltage: in fact, the rebounded wave will shuffle with the own oscillations of the piezo, becoming

undetectable. With a well-shaped damper and small duration pulses (“fractions” of waves), this problem is

readily solved. Then secondly, for each pulsed wave there would be several echoes with different delays and

intensities: if these detected measurements are quite similar, it is quite possible they stem from the same

obstacle and not for instance by diffusion or diffraction phenomena. Repeatability is a quite fundamental

property of every measurement system, and it is the way to control that the recorded signal is effectively

produced by the wave impinging with the obstacle. The duration of the pulse is called pulse duration (PD)

and it represent the period of the emitted wave by the number of launched oscillations:

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PAGINE

198

PESO

37.22 MB

AUTORE

Meliuk

PUBBLICATO

10 mesi fa


DETTAGLI
Corso di laurea: Corso di laurea magistrale in biomedical engineering
SSD:
A.A.: 2017-2018

I contenuti di questa pagina costituiscono rielaborazioni personali del Publisher Meliuk di informazioni apprese con la frequenza delle lezioni di Applied measurement techniques e studio autonomo di eventuali libri di riferimento in preparazione dell'esame finale o della tesi. Non devono intendersi come materiale ufficiale dell'università Politecnico delle Marche - Univpm o del prof Scalise Lorenzo.

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