Zhenghui Zhang

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Parallel excitation has been introduced as a means of accelerating multidimensional, spatially-selective excitation using multiple transmit coils, each driven by a unique RF pulse. Previous approaches to RF pulse design in parallel excitation were either formulated in the frequency domain or restricted to echo-planar trajectories, or both. This paper(More)
Parallel transmitter techniques are a promising approach for reducing transmitter B1 inhomogeneity due to the potential for adjusting the spatial excitation profile with independent RF pulses. These techniques may be further improved with transmit sensitivity encoding (SENSE) methods because the sensitivity information in pulse design provides an excitation(More)
Current standard sensitivity-encoded parallel imaging (SENSE) utilizes a fully sampled low-resolution reference scan to estimate the coil sensitivities. This reference scan adds scan time and may introduce misregistration artifacts. The purpose of this study was to investigate the feasibility of estimating the coil sensitivities for spiral SENSE directly(More)
A multidimensional adaptive diagonal recurrent wavelet neural network based on a compact wavelet frame is proposed. The network consists of an initial network and sub-networks that will be incorporated during training according to the precision. Suitable dilation and translation was chosen to construct a single dilation compact wavelet frame to form every(More)
PURPOSE To develop a simple correction approach to mitigate shading in 3 Tesla (T) breast MRI. MATERIALS AND METHODS A slightly modified breast receive (Rx) array, which we termed field shaping array (FSA), was shown to mitigate breast shading at 3T. In this FSA, one Rx element was selectively unblocked and tuned off the Larmor frequency during the(More)
Contrast-enhanced magnetic resonance angiography (CE-MRA) requires high spatial resolution to demonstrate detailed vasculature and high temporal resolution to capture the contrast bolus. Sparse bright voxels in MRA permit substantial undersampling in MRI data acquisition, allowing simultaneous high temporal and spatial resolution. We developed a(More)
A new k-space direct matrix inversion (DMI) method is proposed here to accelerate non-Cartesian SENSE reconstructions. In this method a global k-space matrix equation is established on basic MRI principles, and the inverse of the global encoding matrix is found from a set of local matrix equations by taking advantage of the small extension of k-space coil(More)
To overcome alkali-resistant and synthetic hurdles to alkaline anion-exchange membranes (AAEMs) for alkaline fuel cells, the polyacylation of pre-quaternized monomers as a straightforward and versatile approach has been proposed for the first time. Via this approach, novel aromatic anion-exchange polyelectrolytes featuring a long pendent spacer (i.e.,(More)
William Grissom, Chun-yu Yip, Zhenghui Zhang, V. Andrew Stenger, Jeffrey A. Fessler, Douglas C. Noll Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA Department of(More)
FIELD INHOMOGENEITY COMPENSATION IN HIGH FIELD MAGNETIC RESONANCE IMAGING (MRI) Zhenghui Zhang, PhD University of Pittsburgh, 2006 This thesis concentrates on the reduction of field (both main field B0 and RF field B1) inhomogeneity in MRI, especially at high B0 field. B0 and B1 field inhomogeneity are major hindrances in high B0 field MRI applications. B1(More)