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Technical Developments |
1 From the Department of Radiology, Evanston Northwestern Healthcare, Evanston, Ill (Q.C., C.V.Q., V.M.M., W.L., P.S., R.R.E.); and Department of Radiology, Northwestern University Feinberg School of Medicine, Chicago, Ill (Q.C., V.M.M., S.K.K., W.L., P.S., R.R.E.). Received September 3, 2002; revision requested November 4; final revision received September 22, 2004; accepted October 20. Supported in part by a research grant from the National Institutes of Health (RRE, R01 HL 63690–01). Address correspondence to Q.C., Department of Radiology, New York University School of Medicine, 650 First Ave, Room 600A, New York, NY 10016 (e-mail: qun.chen@med.nyu.edu).
Use of a parallel imaging technique to improve temporal and spatial resolution at three-dimensional contrast-enhanced magnetic resonance (MR) angiography was investigated. Thirty experiments were performed in five groups of healthy subjects. In groups 1–3, the technique was used to improve imaging speed by a factor of two or four while maintaining spatial resolution. Contrast agent concentration was two to four times higher than at standard MR angiography, to take advantage of the faster imaging speed. In groups 4 and 5, the technique was used to double spatial resolution in the phase-encoding direction while maintaining imaging speed and contrast agent concentration. At a two to four times faster imaging speed, signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) almost equaled those at standard MR angiography, likely a result of increased contrast agent concentration. The use of parallel imaging to achieve higher spatial resolution was also proved feasible, but with substantial reduction in SNR and CNR.
© RSNA, 2004
Index terms: Magnetic resonance (MR), high-resolution • Magnetic resonance (MR), technology • Magnetic resonance (MR), three-dimensional • Magnetic resonance (MR), vascular studies
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