In axial-shear strain elastography, the local axial-shear strain resulting from the application of quasi-static axial compression to an inhomogeneous material is imaged. In this paper, we investigated the image quality of the axial-shear strain estimates in terms of the signal-to-noise ratio (SNR(asse)) and contrast-to-noise ratio (CNR(asse)) using simulations and experiments. Specifically, we ...

Introduction One of the most important pre-processing steps in optical coherence tomography (OCT) is reducing speckle noise, resulting from multiple scattering of tissues, which degrades the quality of OCT images. Materials and Methods The present study focused on speckle noise reduction and edge detection techniques. Statistical filters with different masks and noise variances were applied on ...

Random or incoherent noise is an important type of seismic noise, which can seriously affect the quality of the data. Therefore, decreasing the level of this category of noises is necessary for increasing the signal-to-noise ratio (SNR) of seismic records. Random noises and other events overlap each other in time domain, which makes it difficult to attenuate them from seismic records. In this r...

According to the great importance of safety in aerospace industries, identification of dynamic parameters of related equipment by experimental tests in operating conditions has been in focus. Due to the existence of noise sources in these conditions the probability of fault occurrence may increases. This study investigates the effects of noise in the process of modal parameters identification b...

To meet the challenge of providing adequate coverage at high field strength, a combination of two complementary methods is proposed: reshaped waveforms with the VERSE technique and a modulated angle refocusing train. It was hypothesized that pulses can be reshaped and flip angles can be modulated such that power is cut in half and thus coverage doubled. Volunteer experiments at 3T using an SSFS...

In modern wireless communications, numerous diversity techniques are used to improve the performance of signal transmission over multiple channels. This paper focuses primarily on the evaluation of Quasi Orthogonal & Orthogonal Space-Time Block Codes (STBC) for a 4x2 system model. The paper proceeds by checking which of these two codes Orthogonal STBC or Quasi-orthogonal STBC, is better by eval...

Fundamental limits on detection in low SNR