The development of a prototypc Compton scaltering camera based on two 1 cm3 cubic 3-D position scnsitivc CZT detectors is iindcrway in our laboratory. As a practical problem, the mechanical alignmcnt error may be larger than the 1 mm detector position rcsolution. This paper investigates thc cffccts of any possible mechanical alignmcnt error on the reconstructed images by Montc Carlo simulations...

This paper describes a method of implementing thermal power feedback (TPF) into a 5th order nonlinear distortion analysis with Volterra-series. The main advantages of the Volterra analysis is that diferent thermal and electrothermal contributions of distortion can be separated, giving extensive information about dominant distortion mechanisms. As an example, electro-thermal distortion in a simp...

An eventual genetic account of at least one subtype of child speech disorders may require the use of acoustic markers to phenotype children and family members. Acoustic markers have the potential for sensitivity and speci® city that are not available using auditory-perceptual procedures such as phonetic transcription. Prior reports on the use of acoustics in speech-genetics research have descri...

Inaccurate depth map discontinuities are an important source of artifact and distortion in multiview systems and applications requiring depth-based view rendering such as 3DTV or free-viewpoint video. Such errors along depth discontinuities frequently occur during depth estimation and/or depth map coding. In this paper we present a novel method for correcting inaccuracies on the discontinuities...

Let N be the set of all meromorphic functions f deened in the unit disc D that satisfy Nehari's univalence criterion (1 ? jzj 2) 2 jSf(z)j 2. In this paper we investigate certain properties of the class N. We obtain sharp estimates for the spherical distortion, and also a two-point distortion theorem that actually characterizes the set N. Finally, we study some aspects of the boundary behavior ...

Introduction Echo-planar imaging (EPI) is a group of fast data acquisition methods commonly used in fMRI studies. It acquires multiple image lines in k-space after a single excitation, which leads to a very short scan time. A well-known problem with EPI is that it is more sensitive to distortions due to the used encoding scheme. Source of distortion is inhomogeneity in the static B0 field that ...

Introduction: Geometric distortion, an important parameter in neurology and oncology. The current study aimed to design and construct a new three-dimensional (3D) phantom using a 3D printer in order to measure geometric distortion and its 3D reproducibility. Material and Methods: In this study, a new phantom ...

Two existing speech conversion algorithms were modified and used to enhance alaryngeal speech. The modifications were aimed at reducing spectral distortion (bandwidth increase) in a vector-quantization (VQ) based system and the spectral discontinuity in a linear multivariate regression (LMR) based system. Spectral distortion was compensated for by formant enhancement using chirp z-transform and...