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Samenvatting van Projectieradiografie MBTR TECHNOLOGIE
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- Institution
- buis, filtering, anode, katode, ...
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Technologie rico 2De rontgenbuis
Metale
omhulsel (
zorgt dat
kathode en
anode potentiaalverschil constant blijft, langere levenduur. )
Anode wolfraam ( wordt vergast, dun laagje. Kwaliteit zakt . )
Anode en kathode belangrijkste componenten
De opbouw
Elektronen = anode & kathode.
Buis 2 elektronen = diode.
Buitenkant :
Structuur die alles samenhoudt, beschermend omhulsel glas/metaal.
, Gelijk welke richting stralingen, daarom
venster = atoomnr.
Lekstraling: niet-geabosorbeerde
stralingen. Geen invloed op beeld.
1mGy/u
Rontgenbundel :fotonen volle energie
op detector. ? = venster geen hoog
atoomnr.
Collimeren : grootte/opp. veranderen
Kathode
Negatieve zij v rontgenbuis.
1 Filament ( meeste rontgenbuizen met roterende anode hebben 2 filamenten. Kleine en grote
focusspot te creëren? )
Gloeidraad, 2mm diam. 1 a 2 cm L.
Warmt op en straalt elektronen uit.
Hogere thermische emissie = meer elektronen.
2 Focuscup
Filament in focuscup
Negatief geladen , worden dan breed verspreid. Gevolg = elektrostatische afstoting.
Focuscup wordt negatief geladen, elektrobundel kan focussen op anode.
Anode ( wolfraam, koper, molybdeen , grafiet )
- Elektrische geleider
- Mechanische ondersteuning voor de foccusspot ( target )
- Goede warmtegeleider voor hitte ( interac. Elektronen + anode )
- Inductie motor : stator - rotor
Roterende anode : elektrobundel op een veel groter opp. Valt waardoor de hitte op de
anode niet op 1 plaats valt maar verdeeld wordt over focus/target zone van anode.
Warmte cap. Verbeteren door rotatiesnelheid van anode te verhogen. ( 3400 rpm )
Kleinere focus = spatiale resolutie beter.
Grote focus = efficientere hitteverdeling. minder
gedetailleerd.
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