Summary
Exact visualization of valve morphology seems to be possible with the cross-sectional imaging modalities, magnetic resonance imaging (MRI) and the recently introduced technique of multidetector computed tomography (MDCT). These techniques are used, if other non-invasive imaging modalities, like echocardiography, fail or provide only insufficient information. This commonly occurs in the assessment of right ventricular valves. Quantification of valve stenosis is possible by calculating valve orifice area, which can be performed with MRI and MDCT. An estimation of the instantaneous peak gradient can only be achieved by MR flow measurements. MR flow measurement is a reliable method to quantify the degree of mild to moderate stenoses. Quantification of valve regurgitation is possible by measurement of the regurgitation fraction with MR flow measurements as well as with MR volumetry/CT volumetry. But only the MR flow measurement is suitable for the quantification of valve regurgitation in patients with multiple valves involved or cardiac shunting. MRI and probably MDCT are the most reliable methods in the evaluation of ventricular volumes and therefore suitable for the follow-up in patients with valvular heart disease, because changes in volumes are important for therapeutic decisions in these patients. The crucial advantages of MRI compared to CT in the diagnostic of valvular heart diseases however are the absence of radiation exposure, the possibility of quantitative evaluation of valves function using flow measurements and the higher temporal resolution as compared to MDCT.
Zusammenfassung
Eine genaue Visualisierung der Klappenmorphologie ist sowohl mit der MRT als auch mit Hilfe der kürzlich eingeführten Methode der Multidetektorcomputertomographie (MDCT) möglich. Diese Methoden der Visualisierung der Klappen werden immer dann eingesetzt, wenn mit anderen nichtinvasiven Verfahren, wie z.B. der Echokardiographie, keine oder eine nur unzureichende Bildgebung möglich ist. Dies ist insbesondere bei Veränderungen der Klappen des rechten Ventrikels der Fall. Eine Quantifizierung von Klappenstenosen ist durch Bestimmung der Klappenöffnungsfläche, sowohl mit der MRT als auch mit der MDCT, durchführbar. Eine Abschätzung des instantanen Druckgradienten ist jedoch nur mit Hilfe der MR-Flussmessung möglich und liefert im Bereich von geringen bis mittleren Gradienten hinreichend zuverlässige Werte. Eine Quantifizierung von Klappeninsuffizienzen ist durch Bestimmung der Regurgitationsfraktion, sowohl mit Hilfe der MR-Flussmessung als auch mit der MR-Volumetrie oder CT-Volumetrie möglich. Nur die MR-Flussmessung lässt sich allerdings auch beim Vorliegen weiterer Klappenvitien oder kardialer Shuntverbindungen zur Quantifizierung einsetzen. Die MRT und wahrscheinlich auch die MDCT stellen die exaktesten bildgebenden Methoden zur Bestimmung der Ventrikelvolumina dar und sind damit gut geeignet für das Follow-up von Patienten mit Klappenerkrankungen, da Veränderungen der Volumina häufig therapieentscheidend sind. Die entscheidenden Vorteile der MRT gegenüber der CT in der Diagnostik von Herzklappenerkrankungen stellen die fehlende Strahlenexposition, die Möglichkeit einer quantitativen Beurteilung der Klappenfunktion durch die Flussmessung sowie die höhere zeitliche Auflösung im Vergleich zur MDCT dar.
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Gutberlet, M., Abdul-Khaliq, H., Stobbe, H. et al. Einsatz moderner Schnittbildverfahren in der Diagnostik von Herzklappenerkrankungen. Z Kardiol 90 (Suppl 6), 2–12 (2001). https://doi.org/10.1007/s003920170002
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DOI: https://doi.org/10.1007/s003920170002
Key words
- Magnetic resonance imaging
- multi-detector computed tomography
- electron beam computed tomography
- flow measurement
- cardiac valve disease