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Samenvatting MRI periode 2
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Ik heb de leerdoelen van periode 2 uitgewerkt. Deze zijn nodig voor de MBRT-Tech toets.
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Samenvatting MRIPERIODE 2
Inhoudsopgave
Leerdoelen.................................................................................................................................................... 2
Samenvatting................................................................................................................................................. 3
Precessie...............................................................................................................................................................3
Lamor frequentie..................................................................................................................................................3
Resonantie............................................................................................................................................................3
Sequentie..............................................................................................................................................................3
Sequentie: 90° RF puls.....................................................................................................................................4
Sequentie: FID-signaal.....................................................................................................................................4
Sequentie: 180° RF-puls en echo.....................................................................................................................4
180° refaseringspuls.............................................................................................................................................4
TR en TE................................................................................................................................................................5
Relaxatie...............................................................................................................................................................5
T1 tijd....................................................................................................................................................................5
T2 tijd....................................................................................................................................................................6
Weging.................................................................................................................................................................6
Techniek................................................................................................................................................................6
Signaalintensiteiten..............................................................................................................................................7
Signaalintensiteiten T1.....................................................................................................................................8
Signaalintensiteiten T2.....................................................................................................................................8
Techniek spinechosequentie.................................................................................................................................8
T1, T2 en PD..........................................................................................................................................................9
Scantijd SE............................................................................................................................................................9
Doel TurboSpinEcho/FastSpinEcho.....................................................................................................................10
Voorbeeld......................................................................................................................................................10
Matrix en spatiële resolutie................................................................................................................................10
Matrix, scantijd en turbofactor..........................................................................................................................10
Parameters TSE..................................................................................................................................................11
TE (echotijd) bij een TSE/FSE..............................................................................................................................11
Beeldcontrast bij TSE..........................................................................................................................................11
J-Coupling.......................................................................................................................................................11
Beeldcontrast SE versus TSE/FSE........................................................................................................................11
Artefacten...........................................................................................................................................................11
Blurring..........................................................................................................................................................11
Veiligheid: opwarming.......................................................................................................................................11
Gevaren..........................................................................................................................................................12
Wanneer........................................................................................................................................................12
1
, Veiligheid: SAR....................................................................................................................................................12
LWK.....................................................................................................................................................................13
Leerdoelen
o De fysische achtergrond van T1 en T2 relaxatie toelichten;
o Kan de termen spin-spin relaxatie en spin-lattice relaxatie koppelen aan T1 of T2
relaxtatie
o De definitie van T1 en T2 tijd noemen;
o Uitleggen wat het FID-signaal is en de snelle afname ervan verklaren;
o De definitie van (puls)sequenties benoemen;
o De (T)SE sequentie toelichten en daarbij de volgende begrippen gebruiken:
90 graden excitatie puls
180 graden refocusseer (echo) puls
Echo signaal
Turbofactor/ETL (echo train length)
Echo spacing
o De begrippen repetitietijd (TR) en echotijd (TE) toelichten
o TR en TE keuze relateren aan de T1 en T2 relaxatie
o Herkennen van T1 en T2 contrastweging in het beeld.
o De formule voor de scantijd toelichten en scantijden van SE en TSE berekenen.
o Verschillen tussen de SE en TSE sequentie benoemen
o Voor- en nadelen van de TSE sequentie benoemen
o Fenomeen blurring en J-coupling verklaren
o De definitie van SAR weergeven en de toepassing ervan uitleggen.
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