Zusammenfassung
Ziel: Die signalverstärkenden Eigenschaften des makromolekularen Kontrastmittels Gadomer
in der MR-Angiographie der Koronararterien im Vergleich zu Gd-DTPA zu prüfen. Material und Methoden: Insgesamt wurden 15 MRT-Untersuchungen an Herzen von Schweinen bei 1,5 T mit einer
Puls-getriggerten, segmentierten 3D-FLASH-Sequenz jeweils während Atemanhaltens vor
und bis zu 30 min nach Injektion des Kontrastmittels durchgeführt. Gadomer wurde in
zwei (0,05 und 0,1 mmol Gd/kg), Gd-DTPA in einer Dosierung (0,3 mmol Gd/kg) geprüft
(je n = 5 Untersuchungen). Quantitativ wurden für Blut und Myokard die Signal-zu-Rausch
(S/R)- und Kontrast-zu-Rausch(K/R)-Werte bestimmt. Qualitativ wurden Bildqualität
und Darstellbarkeit der Koronararterien bewertet. Ergebnisse: Gadomer führt im Vergleich zu Gd-DTPA zu einem länger anhaltenden, gegenüber der
Nativuntersuchung signifikant erhöhten K/R-Anstieg zwischen Blut und Myokard (Gd-DTPA:
nur unmittelbar nach Injektion, Gadomer, 0,05 mmol Gd/kg: bis 5 min; 0,1 mmol Gd/kg:
bis 10 min nach Injektion). Die qualitative Auswertung zeigt, dass die Darstellung
der Koronararterien und der Seitenäste mit Gadomer ohne Unterschied zwischen den beiden
Dosierungen signifikant besser ist als mit Gd-DTPA. Schlussfolgerung: Gadomer ist ein geeignetes Kontrastmittel für die MR-Angiographie der Koronararterien,
wobei die Dosis von 0,1 mmol Gd/kg gegenüber 0,05 mmol Gd/kg Vorteile durch ein verlängertes
Bildgebungsfenster aufweist.
Abstract
Aim: To investigate the signal-enhancing effects of the macromolecular contrast medium
Gadomer in MR angiography of the coronary arteries compared to Gd-DTPA. Material and Methods: A total of 15 MRI examinations of the heart were performed in pigs at 1.5 T using
a pulse-triggered, segmented 3D FLASH sequence with data acquisition during breathhold
before and up to 30 min after contrast medium injection. Gadomer was investigated
at two doses (0.05 and 0.1 mmol Gd/kg), Gd-DTPA at one (0.3 mmol Gd/kg) (n = 5 examinations
per dose). Standard sequences without magnetization preparation were supplemented
by sequences with magnetization saturation applied before data acquisition before
and immediately after contrast medium injection. Analysis comprised quantitative determination
of blood and myocardium signal to noise (S/N) and contrast to noise (C/N) and qualitative
assessment of several parameters of image quality and coronary artery visualization.
Results: Gadomer leads to a significant C/N increase between blood and myocardium compared
to the unenhanced examination and the increase is longer-lasting than that produced
by Gd-DTPA (Gd-DTPA: only directly after injection; Gadomer: up to 5 min post injection
at 0.05 mmol Gd/kg, up to 10 min at 0.1 mmol Gd/kg). The qualitative evaluation shows
that visualization of the coronary arteries and branch vessels is significantly better
with Gadomer at both doses than with Gd-DTPA. Magnetization saturation increases the
C/N in combination with Gd-DTPA and at the higher dose of Gadomer with the latter
producing a higher increase in C/N values. Conclusion: Gadomer is a suitable contrast medium for MR angiography of the coronary arteries
with the dose of 0.1 mmol Gd/kg being superior to 0.05 mmol Gd/kg due to a longer
imaging window.
Key words
MR angiography - coronary arteries - contrast medium - gadolinium - experimental studies
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Dr. med. vet. Jörg Schnorr
Institut für Radiologie, Charité, Medizinische Fakultät der Humboldt-Universität zu
Berlin
Schumannstraße 20/21
10098 Berlin
Telefon: + 49-30-450539044
Fax: + 49-30-450539901
eMail: joerg.schnorr@charite.de