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GAMMA CAMERA
(acquisitions)
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mono-isotope
E1=140keV(Tc99m) ± 10%
E1
N
E
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double-isotope
E1=140keV(Tc99m) ± 10% E2=190keV(Kr81m) ± 10%
E1 E2 N
E
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double-isotope
E1=140keV(Tc99m) -10%+7.5%
E21=117keV(In111) -7.5%+10% + E2
2=245keV(In111) ± 10%
N
E
E1 E21
E22
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double-isotope
tumeur In111 os Tc99m somme
tumeur In111 os Tc99m somme
échelle de gris
échelle bicolore
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Acquisition champ séparé (translation manuelle)
Acquisition champs séparés (rotation manuelle)
Acquisition corps entier (translation automatique)
Acquisition dynamique
Acquisition synchronisée avec le signal ECG
Acquisition tomographique (SPECT)
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Acquisition champ séparé (translation manuelle)
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Acquisition champ séparé (translation manuelle)
thyroïde
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Acquisition champ séparé (translation manuelle)
tête
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Acquisition champ séparé (translation manuelle)
thorax
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Acquisition champ séparé (translation manuelle)
basin
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Acquisition champ séparé (translation manuelle)
pied
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(rotation manuelle)Acquisition champs séparés
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antérieur (ANT)
oblique
postérieur gauche
(OPG)
postérieur (POST)
oblique
postérieur droit
(OPD)
(rotation manuelle)Acquisition champs séparés
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Acquisition corps entier (translation automatique)
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Acquisition corps entier (translation automatique)
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Acquisition dynamique
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T = 0
t . . . . . . . . . .
début des mesures à T = 0,
durée d’une mesure t
durée totale N *t
Acquisition dynamique
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Acquisition synchronisée avec le signal ECG
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signal ECG
R RR - R
QS
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synchronisation
R RR - R
départ comptage 1
départ comptage 2
départ comptage 3
départ comptage N-1
départ comptage N
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nombre d’images et temps d’acquisition
R RR - R
Temps d’acquisition =Cycle (R - R ) / N
N = 8 , 16, 24, 32, 64
M répétitions du Cycle
Temps d’acquisition / image = M*
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cycle 1 cycle 2
Acquisition synchronisée avec le signal ECG
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projectionsAcquisition tomographique (SPECT)
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projections
détecteur
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FIN