Now showing items 11-20 of 204
An Expanded Theoretical Treatment of Iteration-Dependent Majorize-Minimize Algorithms
(IEEE, 2007-09-17)
The majorize-minimize (MM) optimization technique has received considerable attention in signal and image processing applications, as well as in statistics literature. At each iteration of an MM algorithm, one constructs ...
Joint Estimation of Respiratory Motion and Activity in 4D PET Using CT Side Information
(IEEE, 2006-04-06)
In previous work, we proposed a Poisson statistical model for gated PET data in which the distribution was parametrized in terms of both image intensity and motion parameters. The motion parameters related the activity ...
Iterative Tomographic Image Reconstruction Using Fourier-Based Forward and Back-Projectors
(IEEE, 2004-04-05)
Iterative image reconstruction algorithms play an increasingly important role in modern tomographic systems, especially in emission tomography. With the fast increase of the sizes of the tomographic data, reduction of the ...
Fast wave propagation in auditory cortex of an awake cat using a chronic microelectrode arrayThe work was performed at Department of Bioengineering, Arizona State University, ECG 334 MS-9709 Arizona State University, Tempe, AZ 85287-9709, USA.
(IOP Publishing Ltd, 2007-06-01)
We investigated fast wave propagation in auditory cortex of an alert cat using a chronically implanted microelectrode array. A custom, real-time imaging template exhibited wave dynamics within the 33-microwire array (3 ...
Fast, pseudo-continuous arterial spin labeling for functional imaging using a two-coil system
(Wiley Subscription Services, Inc., A Wiley Company, 2004-03)
A fast, two-coil, pseudo-continuous labeling scheme is presented. This new scheme permits the collection of a multislice subtraction pair in <3 s, depending on the subject's arterial transit times. The method consists of ...
Penalized Likelihood Transmission Image Reconstruction:Unconstrained Monotonic Algorithms
(IEEE, 2004-04-15)
Statistical reconstruction algorithms in transmission tomography yield improved images relative to the conventional FBP method. The most popular iterative algorithms for this problem are the conjugate gradient (CG) method ...
Penalized-Likelihood Image Reconstruction for Digital Holography
(Optical Society of America, 2004-05)
Conventional numerical reconstruction for digital holography using a filter applied in the spatial-frequency domain to extract the primary image may yield suboptimal image quality because of the loss in high-frequency ...
Analysis of Observer Performance in Known-Location Tasks for Tomographic Image Reconstruction
(IEEE, 2005-12-27)
We consider the task of detecting a statistically varying signal of known location on a statistically varying background in a reconstructed tomographic image. We analyze the performance of linear observer models in this ...
Detection of Event-Related Spectral Changes in Electrocorticograms
(IEEE, 2005-03-16)
The University of Michigan Direct Brain Interface (UM-DBI) project seeks to detect voluntarily produced electrocortical activity (ECoG) related to actual or imagined movements in humans as the basis for a DBI. In past work ...
Substrate mineralization stimulates focal adhesion contact redistribution and cell motility of bone marrow stromal cells
(Wiley Subscription Services, Inc., A Wiley Company, 2006-11)
Understanding the mechanisms of substrate based control of cell function is critical to the design of biomaterials. Cells interact with their extracellular matrix through cell adhesion contacts. We have previously described ...