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DOI: 10.1148/radiol.2293020782
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Time-of-Flight MR Angiography: Comparison of 3.0-T Imaging and 1.5-T Imaging—Initial Experience1

Winfried A. Willinek, MD, Markus Born, MD, Birgit Simon, MSc, Henriette J. Tschampa, MD, Carsten Krautmacher, MD, Jürgen Gieseke, PhD, Horst Urbach, MD, Hans J. Textor, MD and Hans H. Schild, MD

1 From the Department of Radiology, University of Bonn, Sigmund-Freud-Strasse 25, D-53105 Bonn, Germany (W.A.W., M.B., B.S., H. J. Tschampa, C.K., H.U., H. J. Textor, H.H.S.); and Philips Medical Systems, Best, the Netherlands (J.G.). Received June 27, 2002; revision requested August 23; final revision received March 15, 2003; accepted March 20. Address correspondence to W.A.W. (e-mail: willinek@uni-bonn.de).



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  		Figure 1. Transverse T1-weighted gradient-echo 3D TOF MR angiographic maximum intensity projections in a 40-year-old male healthy volunteer. A, Standard 1.5-T image. B, Standard 3.0-T image. C, High-spatial-resolution 3.0-T image. D, Frontal standard 1.5-T image. E, Standard 3.0-T image. F, High-spatial-resolution 3.0-T image. G, Lateral standard 1.5-T image. H, Standard 3.0-T image. I, High-spatial-resolution 3.0-T image. Note that vessel branches such as M3 segments (F), lenticulostriate arteries (F), and posterior communicating arteries (* in C) are better visualized at high-spatial-resolution 3.0-T imaging than at standard 3.0-T imaging or standard 1.5-T imaging.

 


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  		Figure 2. T1-weighted gradient-echo 3D TOF MR angiographic maximum intensity projections of intracranial arteries in a 50-year-old male patient with moyamoya disease. A, Transverse standard 1.5-T image. B, Transverse standard 3.0-T image. C, Transverse high-spatial-resolution 3.0-T image. D, Frontal standard 1.5-T image. E, Frontal standard 3.0-T image. F, Frontal high-spatial-resolution 3.0-T image. Predominant involvement of right MCA is observed. Only at high-spatial-resolution 3.0-T imaging (C, F) are collateral vessels (open arrows) clearly depicted, as well as faint opacification of main right MCA (solid arrows). Prominent right posterior cerebral artery (arrowheads) is depicted on all images.

 


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  		Figure 3. T1-weighted gradient-echo 3D TOF MR angiographic maximum intensity projections in a 65-year old male patient with right MCA aneurysm (arrows). A, Transverse standard 1.5-T image. B, Transverse standard 3.0-T image. C, Transverse high-spatial-resolution 3.0-T image. D, Coronal standard 1.5-T image. E, Coronal standard 3.0-T image. F, Coronal high-spatial-resolution 3.0-T image. Depiction of aneurysm is better at standard and high-spatial-resolution 3.0-T imaging than at standard 1.5-T imaging. Middle cerebral branch vessels and relationship between aneurysm and parent vessel (arrowheads) are most sharply depicted in C and F. Note that M2 segments are displayed in F but not in D and E.

 


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  		Figure 4. T1-weighted gradient-echo 3D TOF maximum intensity projections in an 81-year-old female patient after ischemic stroke in the right MCA territory. A, Transverse standard 1.5-T image. B, Transverse standard 3.0-T image. C, Frontal standard 1.5-T image. D, Frontal standard 3.0-T image. E, Transverse high-spatial-resolution 3.0-T image. F, Frontal high-spatial-resolution 3.0-T image. In A, right MCA stenosis (arrow) is not displayed as clearly as it is in B and C. Higher SNR and improved vessel-tissue contrast in B allow sharper appearance of the stenosis, with best image quality in C. Visualization of M2 segments is superior in F compared with that in D and E.

 




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