نتایج جستجو برای: pulse sequences
تعداد نتایج: 299737 فیلتر نتایج به سال:
BACKGROUND Standard MRI has been used for high-grade gliomas detection, albeit with limited success as it does not provide sufficient specificity and sensitivity to detect complex tumor structure. Therefore targeted contrast agents based on iron oxide, that shorten mostly T2 relaxation time, have been recently applied. However pulse sequences for molecular imaging in animal models of gliomas ha...
BACKGROUND Epiretinal prosthesis is one device for the treatment of blindness, which target retinal ganglion cells (RGCs) by electrodes on retinal surface. The stimulating current of epiretinal prosthesis is an important factor that influences the safety threshold and visual perception. Stochastic resonance (SR) can be used to enhance the detection and transmission of subthreshold stimuli in ne...
Modern NMR pulse sequences usually consist of a series of radiofrequcncy (rf) pulscs having orthogonal (quadrature) phases. While there are a variety of situations where pulse accuracy is important, 1 it is especially critical for solid-state multiple-pulse NMR.2 In fact, multiple pulse sequences developed for phase measurement excced the accuracy of traditional electronic phase measuremen t te...
We demonstrate experimentally that random phase modulation of an erbium-doped fiber ring-laser by intra-cavity electro-optic modulator did not inhibit ultrashort-pulse operation. Stable and self-starting operation with a single pulse circulating in the cavity was achieved even when driven sequences sufficiently fast strong to render laser modeless, sense heterodyning output show any spectral li...
Spin echo pulse sequences are used to produce clinically important T(2) contrast. However, conventional 180° radiofrequency pulses required to generate a spin echo are highly susceptible to the B(1) inhomogeneity at high magnetic fields such as 7 Tesla (7 T), resulting in varying signal and contrast over the region of interest. Adiabatic 180° pulses may be used to replace conventional 180° puls...
Sequences of low-energy electrical pulses can effectively terminate ventricular fibrillation (VF) and avoid the side effects conventional high-energy defibrillation shocks, including tissue damage, traumatic pain, worsening prognosis. However, systematic optimisation sequences remains a major challenge. Using 2D simulations homogeneous cardiac genetic algorithm, we demonstrate with non-uniform ...
We present an 880 nm quasi-continuously pumped, grazing-incidence " bounce " amplifier system, capable of producing picosecond pulses (12 – 100 ps) and tailored pulse sequences at the mJ-level. More than 1.8 mJ of pulse energy was achieved for a 58 ps pulse, using sub-100 pJ seeding energy (up to a repetition rate of 300 Hz). Owing to saturation effects, the pulse-to-pulse energy fluctuations w...
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