In order to permit a more optimized selection of acquisition parameters for nuclear magnetic resonance (NMR) imaging a simulation procedure is proposed to determine the pulse sequences for optimal tissue contrast for a variety of clinical indications. In selected patient studies an adequate set of source images is measured, which allows computation of images of all possible pulse sequences, and...

Fat suppression is an important technique in musculoskeletal imaging to improve the visibility of bone-marrow lesions; evaluate fat in soft-tissue masses; optimize the contrast-to-noise ratio in magnetic resonance (MR) arthrography; better define lesions after administration of contrast material; and avoid chemical shift artifacts, primarily at 3-T MR imaging. High-field-strength (eg, 3-T) MR i...

A new type of graphical tool for explaining and analyzing magnetic resonance imaging pulse sequences is developed and illustrated. This tool combines the partition diagram, which shows the evolution of multiple echoes with the application of multiple RF pulses, and k-space graphs, which show the evolution of the transverse magnetization as gradients are applied. The strength of the new tool lie...

Binary pulse-position modulated (PPM) control signal is widely used in remotely controlled unmanned aerial vehicles. It consists of data frames, which contain a synchronizing pulse followed by a number of shorter pulses equal to the number of channels N. In this paper we present analysis and optimization of direct sequence spread spectrum (DS-SS) scheme for PPM control signal protection. That s...

Abstract Experiment of time sequential pulse train synthesis using a layered and partially recurrent complex valued neural network is reported A half of the three layer complex valued neural network is used to generate sinusoidal oscillation and the other half to synthesize adaptively the intended pulse shapes and sequences Stable time sequential pulse signals are obtained after completion of l...

Ultra-Wideband Direct Sequences Code Division Multiple Access (DS-DMA) plays an important role in the case of multi-terminal multi-application communications UWB devices. In systems that exploit injection pulse itself directly to antenna hence very wide bandwidth, generation suitable DS-CDMA codes poses a real challenge. this paper we will describe our novel transmission which uses pseudo-ortho...

in this paper, we introduce and study the concepts of $mathcal{i}_2$-convergence, $mathcal{i}_2^{*}$-convergence for double sequences of fuzzy real numbers, where $mathcal{i}_2$ denotes the ideal of subsets of $mathbb n times mathbb n$. also, we study some properties and relations of them.

The relevance of cortical grey matter pathology in multiple sclerosis has become increasingly recognised over the past decade. Unfortunately, a large part of cortical lesions remain undetected on MRI using standard field strength. In vivo studies have shown improved detection by using higher magnetic field strengths up to 7 T. So far, a systematic histopathological verification of ultrahigh-fie...

We present theory, simulations and experimental demonstrations of composite 1T pulses for population inversion in coupled spin systems such as occur in solid state NMR. The composite 1T pulses are phase-shifted rf pulse sequences designed to invert spins over a larger range of dipole or quadrupole couplings than a conventional1T pulse, for a given rfpower. We discuss a previously proposed theor...

Twenty patients in whom CT had unequivocally demonstrated the presence of calcification in a diversity of lesions and who had undergone MR, performed at 0.6 T and with standard T1- and T2-weighted pulse sequences, were retrospectively studied to determine the MR signal-intensity characteristics of the calcifications and to assess the ability of MR to detect the presence of this abnormality. CT ...