background: speech perception ability depends on auditory and extra-auditory elements. the signal-to-noise ratio (snr) is an extra-auditory element that has an effect on the ability to normally follow speech and maintain a conversation. speech in noise perception difficulty is a common complaint of the elderly. in this study, the importance of snr magnitude as an extra-auditory effect on speech...

background and aim: with regard to the shortage of proper materials in persian for the evaluation of speech perception in children, this study aimed to develop the persian version of the bkb sentence test, and determine its content validity in normal persian speaking children aged 6-12 years. methods: this study was an applied research. the study procedure comprised sentence construction, deter...

background: the microarray technology is in needed of cost-effective, low background noise and stable substrates for successful hybridization and analysis. methods: in this research, we developed a three-dimentional stable and mechanically reliable microarray substrates by coating of two polymeric layers on standard microscope glass slides. for fabrication of these substrates, a thin film of ox...

Methods: Fifty-one patients were imaged with a simultaneous gated transmission-emission tomographic system. Each patient had biplane contrast ventriculography (CVG) performed within 90 days of the SPECT study. The tomographic data was acquired over 16 frames/cycle, 64x64 matrix, 6.3mm pixels, over 360 degrees for 16 minutes duration. Attenuation corrected (AC) emission images were reconstructed...

Projection-reconstruction (PR) NMR enables rapid collection of multidimensional NMR data. NOESY represents a particularly difficult challenge for currently existing reconstruction algorithms, as it requires the quantitative reconstruction of an unknown number of peaks, at full sensitivity. We have demonstrated the successful application of PR-NMR to NOESY by determining the 4D methyl/amide NOES...

We introduce a novel method to automatically evaluate Xray computed tomography (CT) images for the purpose of detecting material defects by evaluating the significance of features extracted by first order derivative filters. We determine the noise characteristics of an image using robust estimation methods and compute the noise of the filtered image via error propagation. The significance of th...

Abstract: An Image is often corrupted by noise in its acquisition and transmission. Noise is any undesired information that contaminates an image. Speckle or Multiplicative noise, is a signal-dependent form of noise, whose magnitude is related to the value of the original pixel. This tends to reduce the image resolution and contrast. Denoising speckle is one of the most important process to inc...

UNLABELLED Gated SPECT recorded with 16 intervals determines left ventricular (LV) ejection fraction more accurately than does gated SPECT recorded with 8 intervals but produces higher image noise. This study aimed to assess the results from sestamibi and (201)Tl 16-interval gated SPECT when both signal-to-noise ratio and spatial resolution were enhanced with an original method of reconstructio...