Time-resolved projection MRA: clinical application in intracranial vascular malformations

We report preliminary results of imaging intracranial vascular malformation s with time-resolved projection MRA after a bolus injection of contrast med ian before and after endovascular treatment. Projection angiograms are acqu ired with a slice-selective snapshot FLASH sequence with a time resolution of two images per second, 40-60 images being acquired consecutively after b olus injection of 15 ml Gd-DTPA. Postprocessing of images in 2D projection MRA by correlation analysis offers several advantages with significant impr ovement of signal-to-noise, leading to adequate anatomical resolution. Subs econd projection MRA is a reliable technique for imaging intracranial vesse ls and gives information about the haemodynamics of vascular malformations.