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Samenvatting Technologie II: Fluoroscopie

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Samenvatting fluroroscopie

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Uploaded on
December 21, 2021
Number of pages
6
Written in
2021/2022
Type
Summary

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Technologie: Fluoroscopie
1. Modaliteiten
- Dynamische studies= met contrast
- OK
- Interventionele procedures
- Dosistempo:
• à Fluoroscopie: laag dosistempo
• à Cinegrafie: hoog dosistempo + hoge ruis
Cinegrafie= om katheders te plaatsen
1.1. Toestellen
- Telebediende tafel
• Buis onder of boven tafel
- Mobiele C-boog
- Vaste C-boog:
• Cath lab
§ Floor/ ceiling mounted
§ Mono/ bijlage
• Hybride OK
1.2. Toepassingen
- Artrografie
- Lokale toediening medicatie
- Tractus digestivus
- Tractus urogenitalis
- Lokalisatie peroperatie
- ECRP
- Urologie
- Pijnkliniek
- Interventionele radiologie
- Interventionele neuroradiologie
- Cardiologie
- Elektrofysiologie (aftakking van angiografie voor pacemakers)
2. Beeldvormende keten
- Keten:
• Generator
• Röntgenbuis
§ Kathode
§ Focus
§ Filters
• Collimator
• Tafel (=radioluscent)
• Strooistralenrooster
• Detector
§ Beeldversterker
§ Flat panel detector
• Automatisch dose rate control (ADRC)
• In room monitoren

, 2.2. Röntgenbuis

- Ontwikkelingen
• Conventioneel filament (<800 mA)
• Nieuwe Flat emitters:
§ Hoge buisstroom
§ Grid pulse
§ Langere levensduur
• Anode
§ Focal spot 0.3-0.7mm
§ Rotatiesnelheden tot 200Hz

2.2.1. Kleine focal spot en Flat emitters

- 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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