MR angiography of arteriovenous malformations: usefulness of phase-contrast with different velocity encoding
To evaluate the usefulness of MR angiography in arteriovenous malformations (AVM) and compare the phase-contrast (PC) with different velocity encoding (VENC) and time-of-flight (TOF) techniques, we prospectively studied 27 patients. In 3, PC was performed before and after embolisation and in 5 before and after radiosurgery. VENC was adjusted to 60 cm/s and 10 or 20 cm/s. PC with VENC 60 cm/s demonstrated main feeders in all cases but could not demonstrate smaller feeders. PC with VENC 10 cm/s demonstrated the nidus, draining veins and varices in all cases. After embolisation and radiosurgery, PC with VENC 10 cm/s clearly demonstrated the reduction or obliteration of the nidus and varix. PC is superior to TOF in demonstrating AVMs and is useful for preoperative diagnosis and follow-up, especially after embolisation and radiosurgery.
Key wordsArteriovenous malformation Magnetic resonance angiography Phase contrast
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