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Huston J III, Fain SB, Riederer SJ, Wilman AH, Berntein MA, Busse RF. Carotid arteries: maximizing arterial to venous contrast in fluoroscopically triggered contrast-enhanced MR angiography with elliptic centric view ordering. Radiology 1999; 211:265-273. • A recent technological development is described and applied in 40 consecutive patients with cerebrovascular disease. The authors used a high-resolution sequence with a 40-s acquisition time. The lowest spatial frequencies were sampled at the beginning of the acquisition and the sequence was manually triggered by magnetic resonance fluoroscopy. This allowed venous suppression and high-quality images in 36 studies (90%).
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Remonda L, Heid O, Schroth G. Carotid artery stenosis, occlusion, and pseudo-occlusion: first-pass, gadolinium-enhanced, three-dimensional MR angiography: preliminary study. Radiology 1998; 209:95-102. •• This is a prospective study conducted in 21 consecutive patients to compare gadolinium-enhanced three-dimensional MRA with conventional catheter angiography for the evaluation of carotid artery stenosis. The authors used dynamic sequences using a 9.5-s scan time with four consecutive three-dimensional acquisitions starting immediately after the bolus injection was initiated. The agreement with conventional angiography was 94% for the detection of severe stenoses.
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Leclerc X, Martinat P, Godefroy O, Lucas C, Giboreau F, Soto Ares G, et al. Contrast-enhanced three-dimensional with steady-state (FISP) MR angiography of supraaortic vessels: preliminary study. Am J Neuroradiol 1998; 19:1405-1413.
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MR angiography of internal carotid arteries: Breath-hold gd-enhanced 3D fast imaging with steady-state precession versus unenhanced 2D and 3D time-of-flight techniques
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Sardanelli F, Zandrino F, Parodi RC, De Caro G. MR angiography of internal carotid arteries: breath-hold gd-enhanced 3D fast imaging with steady-state precession versus unenhanced 2D and 3D time-of-flight techniques. J Comput Assist Tomogr 1999; 23:208-215. •• This study compared a contrast-enhanced three-dimensional MRA sequence using a 30-s scan time with unenhanced two-dimensional and three-dimensional TOF sequences in 30 patients with carotid atherosclerotic disease. The authors found a significant difference in the overestimation of the degree of stenosis with the TOF techniques.
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Kim JK, Farb RI, Wright GA, Test bolus examination in the carotid artery at dynamic gadolinium-enhanced MR angiography. Radiology 1998; 206:283-289. • The test bolus examination is described and evaluated to determine its reliability to calculate the transit travel time from a brachial vein to the carotid artery. The technique was found to be a simple tool, that is inexprensive and effective as a prelude to three-dimensional MRA to acquire first-pass arterial enhancement images.
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Lentschig MG, Reimer P, Rausch-Lentschig UL, Allkemper T, Oelerich M, Laub G, Breath-hold gadolinium-enhanced MR angiography of the major vessels at 1.0 T: dose-response findings and angiographic correlation. Radiology 1998; 208:353-357.
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Ho VB, Foo TKF. Optimization of gadolinium-enhanced magnetic resonance angiography using an automated bolus-detection algorithm (MR smartprep). Invest Radiol 1998; 33:515-523.
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Isoda H, Takehara Y, Isogai S, Takeda H, Kaneko M, Nozaki A, et al. Technique for arterial-phase contrast-enhanced three-dimensional MR angiography of the carotid and vertebral arteries. Am J Neuroradiol 1998; 19:1241-1244. • This paper suggests utility of the smartprep technique to selectively enhance the carotid and vertebral arteries. By using a tracker volume placed in the common carotid artery, the three-dimensional angiographic sequence is automatically triggered when the signal increases beyond a preset threshold.
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Am J Neuroradiol
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Slosman F, Stolpen AH, Lexa FJ, Schnall MD, Langlotz CP, Carpenter JP, et al. Extracranial atherosclerotic carotid artery disease: evaluation of non-breath-hold three-dimensional gadolinium-enhanced MR angiography. AJR Am J Roentgenol 1998; 170:489-495.
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