Fiche 6- Imagerie Médicale Flashcards by mad mig | Brainscape

Q

Entropie de Shannon

A

Hb=-Σ(1 à n) pi.logb(pi)

Pi= porba du signal i
En base 2: b=2, Hb s’exprime en bits

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Q

rapport signal/ bruit

A

Signal/bruit= N/√N=√N

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Q

Expression du bruit réel

A

Br=√(Bi²+Bd²)

Bi: bruit intrinsèque (biologique)
Bd: bruit dû à la chaine de mesure

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