- Hoge mAs: kortere pulsduur à meer scherpte in beeld
- Kijken naar een dynamisch beeld à soms overlap uit beelden die ssamengekomenà daardoor ontstaat
lag
- Bij grote focalspot: blushing
• Kleinere = betere weergave
• Betere geometrische onscherpte wordt vertaald in dosisreductie à minder dosis voor zelfde
weergave van objecten
2.3. Acquisitiemodi
- Gepulseerde fluoroscopie: laag dosistempo
• 1-30p/s =kort
- Continue fluoroscopie
• Intussen verboden voor nieuwe toestellen
- Cinegrafie
• 1-15 p/s: vascularisatie procedures
• 7,5-30 p/s: Cardio, pediatrie
• Hoge mA
• Pulsbreedte tot 200 mA
• Runs tot enkele sec
- Digital substraten angiografie (DSA)
- Roadmap
- Flat panel CT: 1 boog rond pt, daarbij worden coupes door de pt gemaakt
2.3. Filters
- Al, Cu
• Huiddosis daalt
• Automatisch door gebruiker
• Dynamisch obv ADRC
- Wedge Filters
• Gedeelte radiolucent
• Door gebruiker bedient
• Ingangsdosis daalt
• Contrast stijgt
2.4. Collimatie
- Vorm volgens detector
- Verstrooide straling
- Beeldkwaliteit
- Virtuele collimatie: manipulatie van collimator en tafel obv last image holdà Last image hold: laatste
frame dat op scherm staat en zo collimeren zonder straling te geven
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