Search Results - "Macovski, Albert"

A k-space analysis of small-tip-angle excitation by Pauly, John, Nishimura, Dwight, Macovski, Albert

“…We present here a method for analyzing selective excitation in terms of spatial frequency ( k) space. Using this analysis we show how to design inherently…”
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Prepolarized magnetic resonance imaging around metal orthopedic implants by Venook, Ross D., Matter, Nathaniel I., Ramachandran, Meena, Ungersma, Sharon E., Gold, Garry E., Giori, Nicholas J., Macovski, Albert, Scott, Greig C., Conolly, Steven M.

“…A prepolarized MRI (PMRI) scanner was used to image near metal implants in agar gel phantoms and in in vivo human wrists. Comparison images were made on 1.5‐…”
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Fast spiral coronary artery imaging by Meyer, C H, Hu, B S, Nishimura, D G, Macovski, A

“…A flow-independent method for imaging the coronary arteries within a breath-hold on a standard whole-body MR imager was developed. The technique is based on…”
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Multifrequency interpolation for fast off-resonance correction by Man, L C, Pauly, J M, Macovski, A

“…Field inhomogeneities or susceptibility variations produce blurring in images acquired using non-2DFT k-space readout trajectories. This problem is more…”
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Inhomogeneity correction using an estimated linear field map by Irarrazabal, P, Meyer, C H, Nishimura, D G, Macovski, A

“…A fast and robust method for correcting magnetic resonance image distortion due to field inhomogeneity is proposed and applied to spiral k-space scanning. The…”
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MRI: A charmed past and an exciting future by Macovski, Albert

“…The invention and development of MRI took place under very desirable circumstances. Dr. Lauterbur, a distinguished NMR chemist, conceived of the basic idea…”
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MR spectroscopic imaging of collagen: tendons and knee menisci by Gold, G E, Pauly, J M, Macovski, A, Herfkens, R J

“…Water molecules associated with collagen have short transverse (T2) relaxation times. Projection-reconstruction techniques are able to achieve an echo time…”
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Noise in MRI by Macovski, A

“…This study analyzes the signal-to-noise ratio (SNR) in magnetic resonance imaging. The factors that determine the SNR are derived starting from basic…”
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A reduced power selective adiabatic spin-echo pulse sequence by Conolly, S, Glover, G, Nishimura, D, Macovski, A

“…We introduce a selective adiabatic pulse sequence suitable for generating selective spin-echoes for both MR imaging and spectroscopy. The technique is simple;…”
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Pulsed saturation transfer contrast by Hu, B S, Conolly, S M, Wright, G A, Nishimura, D G, Macovski, A

“…In vivo 1H conventional NMR image contrast generation usually relies on the macroscopic T1 and T2 relaxation parameters of the tissues of interest. Recently…”
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MRS imaging using anatomically based k-space sampling and extrapolation by Plevritis, S K, Macovski, A

“…A comprehensive strategy for the acquisition, reconstruction, and postprocessing of MR spectroscopic images is presented. The reconstruction algorithm is the…”
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MR angiography by selective inversion recovery by Nishimura, D G, Macovski, A, Pauly, J M, Conolly, S M

“…A modified inversion-recovery sequence is introduced which performs subtraction angiography by varying time-of-flight effects of blood flowing into an imaged…”
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Considerations of magnetic resonance angiography by selective inversion recovery by Nishimura, D G, Macovski, A, Pauly, J M

“…In the selective inversion recovery method for projection angiography, upstream blood is tagged by an inversion excitation and then allowed to flow into the…”
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Introduction to: A k-space analysis of small-tip-angle excitation by Pauly, John M., Nishimura, Dwight G., Macovski, Albert

“…The article “A k-space analysis of small-tip-angle excitation” introduced a spatial frequency interpretation of the effect of RF excitation pulses. This…”
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Magnetic resonance angiography by selective inversion recovery using a compact gradient echo sequence by Nishimura, D G, Macovski, A, Jackson, J I, Hu, R S, Stevick, C A, Axel, L

“…We have studied a pulse sequence using compact imaging gradients for MR angiography by selective inversion recovery. By acquiring signals approaching a…”
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A method for selective tissue and bone visualization using dual energy scanned projection radiography by Brody, W R, Butt, G, Hall, A, Macovski, A

“…Information contained in the x-ray energy spectrum can be used to produce selective radiographic images of bone or soft tissue. A method has been devised to…”
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Magnetic resonance imaging with T1 dispersion contrast by Ungersma, Sharon E., Matter, Nathaniel I., Hardy, Jonathan W., Venook, Ross D., Macovski, Albert, Conolly, Steven M., Scott, Greig C.

“…Prepolarized MRI uses pulsed magnetic fields to produce MR images by polarizing the sample at one field strength (∼0.5 T) before imaging at a much lower field…”
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A k-space analysis of small-tip-angle excitation. 1989 by Pauly, John, Nishimura, Dwight, Macovski, Albert

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Iterative Reconstruction-Reprojection: An Algorithm for Limited Data Cardiac-Computed Tomography by Nassi, Menahem, Brody, William R., Medoff, Barry P., Macovski, Albert

“…Cardiac X-ray computed tomography (CT) has been limited due to scanning times which are considerably longer (1 s) than required to resolve the beating heart…”
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Rapid polarizing field cycling in magnetic resonance imaging by Matter, N.I., Scott, G.C., Grafendorfer, T., Macovski, A., Conolly, S.M.

“…We describe the electronics for controlling the independently pulsed polarizing coil in a prepolarized magnetic resonance imaging (PMRI) system and demonstrate…”
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