Fig. 1: General scheme for spin echo based SER-EPI sequence: The standard SER-scheme is extended not only by the refocusing 180 RF-pulse but also by a gradient pulse in phase-encoding direction. This gradient prephasing pulse aligns the gradient echo with the spin echo of the first excitation pulse s1. Fig.2: k-space data of spin-echo based SER-EPI sequence: Phase-encode direction is top to bot...

Introduction: Typically, magnetic resonance spectroscopy sequences attempting to measure glutamate aim to utilize the shortest echo time achievable to reduce the effects of J-coupling and T2 relaxation. However, in 2017, Wong et al. described the optimal echo time for glutamate detection for 7T semi-LASER proton magnetic resonance spectroscopy (1H-MRS) to be in the range of 100 to 125ms, which ...

سابقه و هدف: ورود گونه­­ های ماهی مهاجم دراکوسیستم ­های آبی، سبب بروز انواع اثرات منفی اکولوژیکی اقتصادی-اجتماعی می ­­شود. اولین گام در تجزیه تحلیل مخاطرات ناشی از گونه­ غیر­بومی، شناسایی خطر است بر این اساس ابزارهای متعددی برای ارزیابی خطرات تهاجمی غیربومی به منظور پشتیبانی تصمیم گیرندگان گونه ­­ها ایجاد شده است. هدف پژوهش قدرت تیلاپیای شکم قرمز (Coptodon zillii) حوضه آبریز تالاب شادگان (حوضه‌...

Homomorphic signal processing techniques are used to place information imperceivably into audio data streams by the introduction of synthetic resonances in the form of closely spaced echoes These echoes can be used to place digital identi cation tags directly into an audio signal with minimal objectionable degradation of the original signal

OBJECTIVE To assess the validation status of echocardiography with continuous Doppler (echo-Doppler) as an outcome measure in pulmonary arterial hypertension associated with systemic sclerosis (PAH-SSc). METHODS Structured literature review on full-text English articles was performed using the PubMed and Cochrane databases. Assessment of validation of echo-Doppler was based on the OMERACT fil...

OBJECTIVE To investigate if magnetic resonance spectroscopy (MRS) is the best Magnetic Resonance (MR)-based method when compared to gradient-echo magnetic resonance imaging (MRI) for the detection and quantification of liver steatosis in diabetic patients in the clinical practice using liver biopsy as the reference standard, and to assess the influence of steatohepatitis and fibrosis on liver f...

Man machine interaction requires an acoustic interface for providing full duplex hands-free communication. The transfer-function generalized sidelobe canceller (TF-GSC) is an adaptive beamformer suitable for enhancing a speech signal received by an array of microphones in a noisy and reverberant environment. When an echo signal is also present in the microphone output signals, cascade schemes o...

In this paper, a new multi-path adaptive interpolated FIR (AIFIR)-based echo canceller is presented to perform the echo cancellation in full-duplex digital transmission over digital subscriber loop (DSL). This new approach inherits the concept of conventional AIFIR-based echo canceller, where the long tail portion is modeled by an adaptive sparse FIR filter. We then propose a multi-path structu...

SUMMARY The purpose of this study was to determine whether dual-echo fast fluid-attenuated inversion recovery MR imaging and corresponding T2 brain maps can show different zones in the affected white matter of patients with cerebral X-linked adrenoleukodystrophy. Ten male patients with cerebral X-linked adrenoleukodystrophy underwent imaging performed using dual-echo fast fluid-attenuated inver...

In hands-free communications, the speech signal to be transmitted is disturbed by ambient noise and acoustic echo. So, a processing to reduce these disturbances must be performed before transmission. Classical solutions are cascaded structures where the acoustic echo canceller preceeds or follows the noise reduction system. Recently, we have proposed a new joint system where a noise reduction p...