background and objective: magnetic resonance imaging (mri) is the most sensitive technique to detect multiple sclerosis (ms) plaques in central nervous system. in some cases, the patients who were suspected to ms, whereas mri images are normal, but whether patients don’t have ms plaques or mri images are not enough optimized enough in order to show ms plaques? the aim of the current study is ev...

Mullerian duct anomalies are an uncommon but often treatable cause of infertility. Patients with müllerian duct anomalies are known to have a higher incidence of infertility, repeated first-trimester spontaneous abortions, fetal intrauterine growth retardation, fetal malposition, preterm labor, and retained placenta. The role of imaging is to help detect, diagnose, and distinguish surgically co...

Background The acquisition of high quality Magnetic Resonance (MR) images requires exploring a parameter space for image quality improvement. This iterative process can benefit from simulations of MRI pulse sequences and imaging protocols. Current MRI physics simulators are confined to few pulse sequences and compromises are made due to the high computational power needed. A step-by-step compre...

Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We introduce high-fidelity passband (PB) composite pulse sequences constructed by concatenation of recently derived...

We present a novel direct space-to-time pulse shaper, operating in the 1.5m optical communications band which enables generation of continuous optical pulse sequences at a rate of 100GHz. The apparatus includes several novel features, such as the use of a diffractive optical element for spatial patterning, fiber coupled input/output, and a telescopic configuration which collectively enable gene...

In this paper, we introduce optimal control algorithm for the design of pulse sequences in NMR spectroscopy. This methodology is used for designing pulse sequences that maximize the coherence transfer between coupled spins in a given specified time, minimize the relaxation effects in a given coherence transfer step or minimize the time required to produce a given unitary propagator, as desired....

We report the use of optical pulse shaping to convert single femtosecond pulses into lower-intensity pulse sequences for excitation of photoconductive dipole antennas, which results in the generation of bursts of tunable narrow-band free-space terahertz radiation. Our experiments demonstrate that the use of such pulse sequences can significantly enhance the spectral amplitude of the narrow-band...

Nearly all of MR-imaging in use today is based on a k-space approach making use of the fact, that a linear spatial encoding field – i.e. a gradient – leads to a linear variation of the Larmor frequency of spins. Localization is then achieved by Fourier transformation of the acquired time domain signal into the frequency domain, which directly corresponds to the spatial domain. Consequently two-...

1. Introduction The increasing interest in MRI at high magnetic field (i.e. 3T and above) has mainly been driven by neuro-imaging applications. More specifically, the higher sensitivity to detect activations in functional neuro-imaging studies was a main incentive. With the more widespread availability of high field systems many other applications benefit from the main advantage of higher magne...