ably obtained coronary angiograms of healthy volunteers showing the proximal portions of the left anterior descending and the circumflex arteries. 1. Wang SJ. Nishimura DG. Macovski A. In: Book of abstracts: SMRM 1990. Berkeley. Calif SMRM, 1990; 1295. 2. Pauly J M . Nishimura DG, Macovski A. J Magn Reson 1989: 82:571.156 5 : 0 9 P M MR Angiography at 0.6 T SJ McLachlan. HE Simon, M S Silver, P van Dijk. RG de Graaf, J P Groen, JJ van VaalsPhilips Medfcal Systems North America a n d Best, The Net herlands To date, the development and evaluation of MR angiographic techniques have been carried out mainly on 1.5-T MR systems. The goal of this study was to evaluate these MR angiographic techniques on a midfield (0.5-T) MR imaging system and to determine the advantages and disadvantages of MR angiography at this field strength. 2D and 3D Inflow MR angiograms were obtained in volunteers and patients with use of a Philips Gyroscan T 5 system operating at 0.5 T with 7-mT/m gradients. Imaging protocols were optimized according to the anatomy being imaged. A typical protocol for 2D Inflow included 2-3-mm contiguous or overlapping sections with a TR/TE of 40/11 and a flip angle of 60". 3D Inflow images were collected with 1-1.5-mm sections and a 20' flip angle. Selective presaturation slabs were used to observe arterial or venous flow. MR angiograms were calculated by means of a maximum intensity projection algorithm. The authors found that they were able to get excellent contrast-to-noise ratio between flowing blood and static tissue in volunteers and in patients with a range of vascular conditions, including arteriovenous malformations, aneurysms. and vessel stenoses. The authors conclude that MR angiography at 0.5 T can produce clinically useful and diagnostic information.
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