Zobrazeno 1 - 10
of 18
pro vyhledávání: '"Karthikeyan Kuppusamy"'
Autor:
Azim Celik, M. R. Thompson, Karthikeyan Kuppusamy, Ramesh Venkatesan, Weili Lin, Daniel K. Kido, E. M. Haacke
Publikováno v:
Radiology. 210:253-259
An insertable head gradient coil with a maximum gradient amplitude of 45 mT/m and a rise time of 150 musec along all three major axes was used to collect high-spatial-resolution, single-shot, spin-echo, echo-planar, diffusion-weighted magnetic resona
Publikováno v:
Magnetic Resonance in Medicine. 38:420-428
A three-dimensional (3D) T 1 -weighted sequence was used to acquire high spatial resolution whole brain images in rats before and after the injection of an intravascular contrast agent. These T 1 -weighted images were used to estimate regional cerebr
Autor:
Song Lai, Hiroshige Takeichi, Frank G.C. Hoogenraad, E. Mark Haacke, Weili Lin, Jürgen R. Reichenbach, Karthikeyan Kuppusamy
Publikováno v:
Human Brain Mapping. 5:341-346
A novel noninvasive magnetic resonance imaging (MRI) method was developed to determine in vivo blood oxygen saturation and its changes during motor cortex activation in small cerebral veins. Specifically, based on susceptibility measurements in the r
Publikováno v:
Radiology. 201:106-112
To assess the use of pre-and postcontrast three-dimensional (3D) T1-weighted images to obtain quantitative regional cerebral blood volume (rCBV) maps and to delineate the vascular system of the brain.Sagittal 3D pre-and postcontrast T1-weighted image
Autor:
Weili Lin, Royal Grueneich, E. Mark Haacke, Omar El-Ghazzawy, Benjamin C.P. Lee, Karthikeyan Kuppusamy, Rachael E. Gordon
Publikováno v:
Journal of child neurology. 14(2)
The objective of this study was to demonstrate hemispheric language dominance in normal children. Fifteen normal children were evaluated with functional magnetic resonance imaging (MRI) using an age-related silent word spelling paradigm. The data wer
Publikováno v:
Magnetic resonance imaging. 16(3)
Activation of cortical and subcortical motor areas of the brain, including primary motor cortex, supplementary motor area, basal ganglia and cerebellum, were successfully investigated in seven right-handed, normal volunteers during a simple, rapid, t
Autor:
Azim Celik, Weili Lin, William J. Powers, Richard P. Paczynski, Chung Y. Hsu, Karthikeyan Kuppusamy
Publikováno v:
Magnetic resonance in medicine. 39(3)
A two-dimensional T2*-weighted gradient-echo sequence was used to image the rat brain before and during graded hypoxemia. Changes in R2* (deltaR2*) with respect to the control state were calculated for brain parenchyma and were compared with changes
Autor:
Karthikeyan Kuppusamy, M. Sprenger, Song Lai, Jürgen R. Reichenbach, E. Mark Haacke, F.G.C. Hoogenraad
Publikováno v:
Magnetic resonance in medicine. 39(1)
High-resolution functional imaging experiments at 0.95 Tesla have been performed to determine the changes in oxygen saturation in pial veins during motor activation by measuring both flow and susceptibility changes in the blood. Averaging across subj
Autor:
Mark M. Bahn, Karthikeyan Kuppusamy, Daniel L. Silbergeld, R Wetzel, John W. Miller, Weili Lin, G Hammer, R J Cook, D Cross
Publikováno v:
AJR. American journal of roentgenology. 169(2)
OBJECTIVE: We undertook this study to investigate functional MR imaging as a new clinical method for determining hemispheric language dominance. Seven patients undergoing surgical evaluation for chronic intractable epilepsy were studied. Intracarotid
Publikováno v:
Journal of magnetic resonance imaging : JMRI. 6(4)
MRI revealed activation foci in human somatosensory cortex during protocols involving stimulation of the fingertips with a textured surface. A 2D T2*-weighted gradient echo sequence was used to acquire images. The imaging protocol included acquiring