Time-resolved projection MRA: clinical application in intracranial vascular malformations.
We report preliminary results of imaging intracranial vascular malformations with time-resolved projection MRA after a bolus injection of contrast median before and after endovascular treatment. Projection angiograms are acquired with a slice-selective snapshot FLASH sequence with a time resolution of two images per second, 40-60 images being acquired consecutively after bolus injection of 15 ml Gd-DTPA. Postprocessing of images in 2D projection MRA by correlation analysis offers several advantages with significant improvement of signal-to-noise, leading to adequate anatomical resolution. Subsecond projection MRA is a reliable technique for imaging intracranial vessels and gives information about the haemodynamics of vascular malformations.
Klisch
J
J
Section of Neuroradiology, Department of Radiology, University of Freiburg, Breisacher Strasse 64, 79106 Freiburg, Germany. Klisch@NZ11.UKL.UNIFREIBURG.DE
Strecker
R
R
Hennig
J
J
Schumacher
M
M
D015901:Angiography, Digital Subtraction; D001164:Arteriovenous Fistula / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000628:therapy; D017536:Carotid Artery, Common / Q000000981:diagnostic imaging / Q000473:pathology; D002342:Carotid Artery, External / Q000000981:diagnostic imaging / Q000473:pathology; D003287:Contrast Media / Q000008:administration & dosage; D004388:Dura Mater / Q000098:blood supply*; D004621:Embolization, Therapeutic; D019786:Gadolinium DTPA / Q000008:administration & dosage; D006439:Hemodynamics; D006801:Humans; D007089:Image Enhancement; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D007275:Injections, Intravenous; D002538:Intracranial Arteriovenous Malformations / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000628:therapy; D007601:Jugular Veins / Q000000981:diagnostic imaging / Q000473:pathology; D018810:Magnetic Resonance Angiography / Q000379:methods*; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors
D003287:Contrast Media; D019786:Gadolinium DTPA