More reliable noninvasive visualization of the cerebral veins and dural sinuses: comparison of three MR angiographic techniques.
OBJECTIVE
To compare the visualization of cerebral veins and dural sinuses at contrast material-enhanced three-dimensional (3D) fast low-angle shot (FLASH) magnetic resonance (MR) angiography, time-of-flight (TOF) MR angiography, and phase-contrast MR angiography.


METHODS
The authors prospectively compared the two-dimensional source images, multiplanar reconstructed images, and maximum intensity projection angiograms obtained at contrast-enhanced 3D radio-frequency-spoiled FLASH MR angiography in 20 patients with those obtained at TOF and phase-contrast MR angiographic examinations. Two neuroradiologists in consensus determined the number of visualized cortical veins and graded the quality of visualization of veins and sinuses as intense and continuous, faint and continuous, or noncontinuous. Statistical analysis was performed with the nonparametric sign test and the Wilcoxon matched pairs sign rank test.


RESULTS
The cortical veins, inferior sagittal sinus, and cavernous sinuses were visualized best with FLASH MR angiography (P <.003). The Trolard and Labbé veins were visualized equally well with the FLASH and TOF sequences. For septal, internal cerebral, and Rosenthal left basal vein visualization, phase-contrast MR angiography was inferior to the FLASH and TOF MR angiographic examinations (P <.05). The quality of visualization of the thalamostriate and Galen veins and of the superior sagittal, rectal, and transverse sinuses was the same at all MR angiographic examinations.


CONCLUSIONS
Three-dimensional FLASH MR angiography depicts some venous structures better than do TOF and phase-contrast MR angiographic examinations. The depiction of other veins is the same with 3D FLASH and TOF sequences.
Department of Neuroradiology, University of Heidelberg Medical School, Im Neuenheimer Feld 400, Germany. klaus_kirchhof@med.uni-heidelberg.de
Klaus
K
Kirchhof
Thomas
T
Welzel
Olav
O
Jansen
Klaus
K
Sartor
D000328:Adult; D000368:Aged; D002550:Cerebral Veins / Q000000981:diagnostic imaging*; D003392:Cranial Sinuses / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D018810:Magnetic Resonance Angiography / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011859:Radiography