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Additional collimator problems is the septal thickness that is required in a 511Kev collimator. Septa must be thick enough to attenuate enough photons to create an image.  "PET with SPECT camera systems511Kev coincidence imaging use SPECT dual head camera systems without collimators in coincidence mode. Opposite detectors are electronically configured in coincidence, coincident detection of 2-511Kev annihilation photons is used to define a coincidence line. SPECT& & .PET& & & STOP THE POWER POINT& ..AND TURN ON THE LIGHTS!!!!! EVERYBODY WAKE UP!!!!!!/&  0` gg3` ___ff3` ffB` 3f33f̙` JHBDXb`ff`  F-"nff` fBDXff33` 9 oVPc}` r!Lf.>?" dd@&?lPd@ F lA@" d` n?" dd@   @@``PR    @ ` `,p>>   @  (  T `y  "`y2 B BOo " x D0 2 B BXo "`x D0 2 B B$]o "Zy D0 2 B B`o "Gx D0 2 B Bo "x D0 $  0$ " `  RClick to edit Master text styles Second level Third level Fourth level Fifth level!     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Ramp filter eliminates star artifact by producing negative side regions around hot areas in each projection. The negative side regions cancel out the positive streaks from other projections during a reconstruction. Ramp filter preserves spatial resolution but boosts noise.H  0޽h ? 3380___PPT10.iru=&L]Xmor&u{y|~΃`eb(0\T 8؎dNhjWIE'wOh+'0h hp  SPECT IMAGING Bob Cleary Watermark KC Kendall36Microsoft PowerPoint@BmA@<@(HGDg  F  y--$xx--'--F$!!$&),.024566654}2|0{.z,z)z&{$|!}--'--F$!hjmoqs!t$u&u)u,t.s0q2o4m5j6h6e6b5`4^2]0[.[,Z)[&[$]!^`beh--'--F%!HKMPRS!T$U&V)U,T.S0R2P4M5K6H6F6C5A4?2=0<.;,;);&<$=!?ACFH--'--F$!H9K9M:P;R=S?TAUDVFUITKSNRPPQMRKSHTFSCRAQ?P=N<K;I;F;D<A=??=A;C:F9H9--'--F$!*9-9/:1;3=5?6A7D7F7I6K5N3P1Q/R-S*T'S%R"Q PNKIFDA? =";%:'9*9--'--F%!99:;=?ADFIKNPQRSTSRQ}P|N{KzIzFzD{A|?}=;:99--'@"Arial-. 2 E SPECT IMAGING ."System04-@"Arial-. '2 EOScintillation Cameras.-՜.+,0    $On-screen Show   $ArialTimes New Roman Wingdings WatermarkSPECT IMAGINGSPECT SPECT.. 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