Results 1 - 10 of 160

Brain magnetic resonance imaging with contrast dependent on blood oxygenation.

by S Ogawa , T M Lee , A R Kay , D W Tank - Proc. Natl. Acad. Sci. USA , 1990
"... ABSTRACT Paramagnetic deoxyhemoglobin in venous blood is a naturally occurring contrast agent for magnetic resonance imaging (MRI). By accentuating the effects of this agent through the use of gradient-echo techniques in high fields, we demonstrate in vivo images of brain microvasculature with imag ..."
Abstract - Cited by 648 (1 self) - Add to MetaCart
ABSTRACT Paramagnetic deoxyhemoglobin in venous blood is a naturally occurring contrast agent for magnetic resonance imaging (MRI). By accentuating the effects of this agent through the use of gradient-echo techniques in high fields, we demonstrate in vivo images of brain microvasculature

Field Inhomogeneity Correction based on Gridding Reconstruction for Magnetic Resonance Imaging

by unknown authors
"... Abstract — Spatial variations of the main field give rise to artifacts in magnetic resonance images if disregarded in reconstruction. With non-Cartesian k-space sampling, they often lead to unacceptable blurring. Data from such acquisitions are commonly reconstructed with gridding methods and option ..."
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an exponential function and a balance between reconstruction and correction accuracy. Index Terms — Magnetic resonance imaging, image reconstruction, gridding, field inhomogeneity, off-resonance correction, conjugate phase reconstruction, iterative reconstruction, spiral imaging I.

Reconstruction of the human cerebral cortex from magnetic resonance images

by Chenyang Xu, Dzung L. Pham, Maryam E. Rettmann, Daphne N. Yu, Jerry L. Prince - IEEE Trans. Med. Imag , 1999
"... Abstract—Reconstructing the geometry of the human cerebral cortex from MR images is an important step in both brain mapping and surgical path planning applications. Difficulties with imaging noise, partial volume averaging, image intensity inhomogeneities, convoluted cortical structures, and the req ..."
Abstract - Cited by 69 (11 self) - Add to MetaCart
fuzzy segmentation, an isosurface algorithm, and a deformable surface model, the method reconstructs the entire cortex with the correct topology, including deep convoluted sulci and gyri. The method is largely automated and its results are robust to imaging noise, partial volume averaging, and image

Coil sensitivity encoding for fast MRI. In:

by Klaas P Pruessmann , Markus Weiger , Markus B Scheidegger , Peter Boesiger - Proceedings of the ISMRM 6th Annual Meeting, , 1998
"... New theoretical and practical concepts are presented for considerably enhancing the performance of magnetic resonance imaging (MRI) by means of arrays of multiple receiver coils. Sensitivity encoding (SENSE) is based on the fact that receiver sensitivity generally has an encoding effect complementa ..."
Abstract - Cited by 193 (3 self) - Add to MetaCart
or collimation but by spectral analysis. The idea of Lauterbur (1) to encode object contrast in the resonance spectrum by a magnetic field gradient forms the exclusive basis of signal localization in Fourier imaging. However powerful, the gradient-encoding concept implies a fundamental restriction. Only one

Magnetic resonance spectroscopy and its applications in psychiatry

by Gin S Malhi , Michael Valenzuela , Wei Wen , Perminder Sachdev , Michael Valenzuela , Wei Wen , Perminder Sachdev - Aust N Z J Psychiatry , 2002
"... Over the past two decades, many sophisticated techniques for imaging the brain have been developed and introduced into clinical practice [1, Magnetic resonance spectroscopy is a non-invasive computerized imaging technique that relies on the same nuclear magnetic resonance (NMR) principles that form ..."
Abstract - Cited by 13 (0 self) - Add to MetaCart
charged nuclei Magnetic resonance spectroscopy and its applications in psychiatry Gin S. Malhi, Michael Valenzuela, Wei Wen, Perminder Sachdev Objective: This paper briefly describes neuroimaging using magnetic resonance spectroscopy (MRS) and provides a systematic review of its application

Fusion of Functional Magnetic Resonance Imaging & Electroencephalograph and Its Application

by Yang Lei, Tian Jie, Hu Jin, Wang Xiao-xiang, Pan Xiao-hong
"... Abstract: Multi-Modality fusion is one of the hottest discussed issues in the current research of medical image processing and it has a deep impact on the cognitive science and clinical treatment. In this paper, an fMRI-constraint equivalent dipole model (FC-ECD) based on ICA is proposed to solve t ..."
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Abstract: Multi-Modality fusion is one of the hottest discussed issues in the current research of medical image processing and it has a deep impact on the cognitive science and clinical treatment. In this paper, an fMRI-constraint equivalent dipole model (FC-ECD) based on ICA is proposed to solve

Magnetic Resonance of the Heart

by D Pennell
"... Introduction Cardiovascular magnetic resonance (CMR) is a developing field with enormous potential because of its major attributes of high image quality and resolution combined with non-ionising radiation and versatility. With recent major technological advances, there have been great improvements ..."
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in acquisition speed and quality that makes the use of CMR in a wide range of cardiac conditions robust and valuable. This article reviews the fundamentals of CMR and its current clinical applications. Fundamentals of Cardiovascular Magnetic Resonance There are essentially three types of imaging sequence

DYNAMIC RANGE OF HARMONIC PHASE MAGNETIC RESONANCE IMAGING (HARP-MRI)

by Vijay Parthasarathy, Moriel Ness-aiver, Jerry L. Prince
"... Harmonic phase (HARP) magnetic resonance imaging (MRI) is an image analysis method for measuring tissue motion and strain from tagged MR images. Previous studies in cardiac tagged MRI have demonstrated its utility in the characterization of myocardial infarction, ischemia, and the reperfusion of stu ..."
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Harmonic phase (HARP) magnetic resonance imaging (MRI) is an image analysis method for measuring tissue motion and strain from tagged MR images. Previous studies in cardiac tagged MRI have demonstrated its utility in the characterization of myocardial infarction, ischemia, and the reperfusion

Application of the Fractional Fourier Transform to Image Reconstruction in MRI

by Vicente Parot , Carlos Sing-Long , Carlos Lizama , Cristian Tejos , Sergio Uribe , Pablo Irarrazaval , 2011
"... The classic paradigm for MRI requires a homogeneous B 0 field in combination with linear encoding gradients. Distortions are produced when the B 0 is not homogeneous, and several postprocessing techniques have been developed to correct them. Field homogeneity is difficult to achieve, particularly f ..."
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. Additionally, there has been an increasing interest in spatial encoding by nonhomogeneous, nonbijective spatial encoding magnetic fields (SEMs; Ref. 1). Starting from a general nonlinear field concept, novel techniques including PatLoc (1), O-Space (2), Null Space (3), and PhaseScrambled imaging (4-6) have all

Segmenting the Endocardial Border of the Left Ventricle in Cardiac Magnetic Resonance Images

by H El-messiry, Ha Kestler, O Grebe, H Neumann
"... The proposed method is composed of two phases: Segmentation phase: uses a bottom-up multi-scale analysis, based mainly on taking the advantage of using the morphological scale-space by decomposing the image into a number of scales of different structure size. As a result of the decomposition, the gr ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
The proposed method is composed of two phases: Segmentation phase: uses a bottom-up multi-scale analysis, based mainly on taking the advantage of using the morphological scale-space by decomposing the image into a number of scales of different structure size. As a result of the decomposition
Results 1 - 10 of 160