Artikel
Time resolved contrast-enhanced carotid and cerebral 3D MR angiography
Zeitaufgelöste Kontrastmittelgestützte Karotis und intrakranielle 3D MR-Angiographie
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Veröffentlicht: | 8. Mai 2006 |
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Gliederung
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Objective: The aim is to improve the temporal resolution of CE-MR-Angiography by evaluating a new time-resolved 3D CE-MRA combining parallel acquisition technique (GRAPPA) and echo-sharing technique for the supraaortic and cerebral vessels.
Methods: 14 patients (4 with cerebral AV-malformation, 5 with cerebral AV-malformation as follow-up study after treatment, 3 with AV-Fistula, and 2 with meningeoma) were examined using a new time-resolved ce-MRA technique. The examinations were done on a 1.5T system (Avanto, Siemens AG, Erlangen) using a 12-channel head-coil and a 4-channel neck-coil. The combination of parallel acquisition-technique (GRAPPA 3) and echo-sharing (TREAT 3-5-7) allowed a temporal resolution of less than 1sec per data set. The MR-datasets were evaluated and compared with conventional catheter angiography (DSA).
Results: Temporal resolution was sufficient for evaluating nidus delineation, arterial supply and early-draining veins in correlation with DSA. In the patients with untreated cerebral AVMs and in those after treatment no early-draining veins were seen and the nidus was no longer visible. In the patient group with treated AVF´s, there were no early-draining veins visible as a result of successful treatment. In the patients with meningeoma, visualisation of the feeding arterial branches was possible with good correlation to DSA.
Conclusions: In neurosurgical patients with a treated intracranial AVM and AVF who need follow-up studies, may profit from this imaging technique the most because DSA could be avoided.