Noise in MR image data increases the mean signal intensity of image regions due to the usually performed magnitude reconstruction. Diffusion-weighted imaging (DWI) is especially affected by high noise levels for several reasons, and a decreasing SNR at increasing diffusion weighting causes systematic errors when calculating apparent diffusion coefficients (ADCs). Two different methods are prese...

In this paper, an effective image demosaicking algorithm, which is based on the correlation among the three primary colors, is proposed for mosaic image with Bayer color filter array (CFA). To reduce the distortion and improve the reconstruction quality, the proposed interpolation method makes full use of the brightness information and the edge information. We design several filters with size o...

Introduction: An important step in the reconstruction of an EPI scan is the phase correction between the odd and even lines to reduce the Nyquist ghost. Typically, the correction is performed for each channel, slice, and repetition of a data set separately. We propose a phase correction technique, which determines the phase correction differences between channels and slices with high accuracy i...

larger AIF for the three correction methods: 1.Magnitude averaging (black), 2. Rician correction (red), 3. Complex averaging (green). Figure 2. Gad concentration curves converted from the AIF signals (larger ROI) using different correction methods for SNR = 1.7. The true and complex averaging curves overlap. Figure 1. The relative errors (mean±SD) of the baseline signals to the true value for t...

A large-signal average model for the controlled on-time boost power-factor-correction (PFC) circuit is developed and subsequently linearized, resulting in a small-signal model for the PFC circuit. AC analyses are performed using the small-signal model, revealing new results on the small-signal dynamics of the PFC circuit. The analysis results and model predictions are confirmed with experimenta...

Stewart Crozier received his B.Sc. degree in applied mathematics and engineering from Queen's University, Kingston, Canada in 1979. He received his M.Eng. and Ph.D. degrees in systems engineering from Carleton University, Ottawa, Canada in 1983 and 1990 respectively. He is currently a research scientist with the Communications Research Centre, Ottawa, Canada. His primary research interests are ...

BACKGROUND Reference tissue-based quantification of brain PET data does not typically include correction for signal originating from blood vessels, which is known to result in biased outcome measures. The bias extent depends on the amount of radioactivity in the blood vessels. In this study, we seek to revisit the well-established Logan plot and derive alternative formulations that provide esti...

This paper introduces a short-wave infrared camera logic design based on FPGA. The hardware adopts the architecture of Sofradir Tecless SWIR detector SW640+Xilinx FPGA xc4vsx55, which has dual working mode 640×512 at 25 FPS and 64×48 4000 FPS. function high precision target tracking can be realized by frequency capture laser signal. In this design, non-uniform correction coefficient table in SD...

Introduction: IDEAL (Iterative Decomposition of water and fat with Echo Asymmetry and Least squares estimation) has proven to be a robust method to achieve uniform water-fat separation [1]. Recently, it has been adopted in quantitative analysis of adiposity as well [2]. However, the three-point acquisition prolongs the scan time, which leads to increased susceptibility to motion. The presence o...

Cascaded delta–sigma (MASH) modulators for higher order oversampled analog-to-digital conversion rely on precise matching of contributions from different quantizers to cancel lower order quantization noise from intermediate delta–sigma stages. This first part of the paper studies the effect of analog imperfections in the implementation, such as finite gain of the amplifiers and capacitor ratio ...