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Echografie (+ artefacten) 22/23, MBRT semester 1 - jaar 1 $6.14   Add to cart

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Echografie (+ artefacten) 22/23, MBRT semester 1 - jaar 1

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- echografie -artefacten - scanvlakken - begrippen

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  • November 5, 2022
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  • 2022/2023
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Echografie – semester 1
CoEC1 – introductie echografie
- het geluid wat sneller terugkomt dan een halve seconde, kunnen we niet nauwkeurig
meten.
- voor details op onderlinge afstand van 2 mm in het lichaam, is een luistertijd nodig van ca.
0.3 microseconde.
- hoe korter de puls, des te meer detail.

Hertz (Hz) = aantal trillingen per seconde
Frequentie < 16 Hz noemen we infrasoon geluid
Frequentie > 20 kHz noemen we ultrasoon geluid


Basis voorwaarden medisch onderzoek
- zender (transducer): trillingen (geluid)
- hoge frequentie (1.5-20 MHz): korte golftreintjes
- korte luistertijden: ondiep gelegen structuren
- ontvanger (transducer): trillingen detecteren en registreren


hoge frequentie
- kleinere details (betere beeldkwaliteit = hoge resolutie)
- meer verzwakking (vooral oppervlakkige structuren)


lage frequentie
- minder kleine details (lage resolutie)
- minder verzwakking (geschikt voor dieper gelegen structuren)
de echo toestellen kunnen gebruik maken van frequenties tussen 1-50 MHz (50.000.000
trillingen per seconde). Daarmee kunnen we zeer kleine details, op korte afstand en zeer
ondiep gelegen herkennen en onderscheiden.


3 typen transducers (die we veel tegenkomen)

, De binnenkant van een transducer
- hoe dikker het kristal, des te lager de frequentie. Dunnere kristallen zijn moeilijker te
maken, en dus duurder.




Scanvlakken
- oblique komt het meeste voor bij de echografie, omdat geen 1 orgaan exact in 1 v.d. 3
liggingen(vlakken) ligt.

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