Esame Doppler Standard Dr. Vittorio Emanuele DOPPLER On the colored light of the Double Stars and...
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Transcript of Esame Doppler Standard Dr. Vittorio Emanuele DOPPLER On the colored light of the Double Stars and...
![Page 1: Esame Doppler Standard Dr. Vittorio Emanuele DOPPLER On the colored light of the Double Stars and Certain Other Stars of the Heavens Royal Bohemian Society.](https://reader035.fdocuments.net/reader035/viewer/2022062404/5542eb69497959361e8d58e0/html5/thumbnails/1.jpg)
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Esame Doppler Standard
Dr. Vittorio Emanuele
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DOPPLER
On the colored light of the Double Stars and Certain Other Stars of the Heavens
Royal Bohemian Society Of SciencesPrague, 1843
APPLICAZIONE ALLA MEDICINASATOMURA 1950
Prof. A. Pujia UMG - Modificato
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ACUSTICA
OTTICA
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2ft v cos c
f = Doppler shiftft = frequenza TX suonov = velocità sangue= angolo asse ultrasuoni
asse vasoc = velocità TX suono
=f
v
Prof. A. Pujia UMG - Modificato
E F F E T T O D O P P L E R
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Backscattering
Nicolosi
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Nicolosi
Sorgente Fissa
Sorgente Mobile
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Nicolosi
Angolo di insonazione
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Relazione tra angolo di insonazione e velocità osservata
15°30°
45°
60°
0.97
0.87
0.71
0.5
Prof. A. Pujia UMG - Modificato
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Rapporto angolo incidenza-errore
Prof. A. Pujia UMG - Modificato
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Nicolosi
Doppler Continuo
Doppler Pulsato
– due cristalli– scarsa risoluzione
spaziale– più facile da usare
– un solo cristallo– buona risoluzione
spaziale– aliasing– più difficile da usare
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Fasi dell’onda
Pulse rise timePulse decay time
Peak forward velocity
Peak reverse velocity
Prof. A. Pujia UMG - Modificato
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Effetto della turbolenza
Ampliamento spettroSpettro NormaleProf. A. Pujia UMG - Modificato
Flusso Laminare Flusso Turbolento
Stenosi
Stenosi
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Analisi velocità
Zero crossing: Media di tutte le
velocità
Analisi spettrale:Analisi di tutte le velocità
Prof. A. Pujia UMG - Modificato
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Trasformata di Fouriered analisi spettrale
Nicolosi
Permette di scomporre un segnale generico in una somma di sinusoidi con frequenze e ampiezze a fasi
diverse (Spettro)
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ESEMPI DI ONDE VELOCIMETRICHE
Prof. A. Pujia UMG - Modificato
Tessuti a bassa resistenza Tessuti ad alta resistenza
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Teorema del Campionamento di ShannonLa minima frequenza di campionamento
necessaria per evitare ambiguità nella ricostruzione del segnale è pari al doppio
della banda.
Limite di Nyquist
Aliasing
Nicolosi
LIMITI DEL PULSATO
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Moving Target
Indicator
&
Color Doppler
Nicolosi
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Nicolosi
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Nic
olos
i
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Nicolosi
RIASSUNTO