PURPOSE To determine a reference background urinary thallium level; to compare urinary thallium data from workers to this background level; to investigate factors affecting these levels and whether creatinine correction is appropriate. METHODS Urine samples from non-occupationally exposed people (n = 273, from 113 individuals) and workers (n = 896, from 447 individuals) were analysed for thal...

A mixed-mode error correction scheme is described for multibit ADCs with resistor-string and switched-capacitor DACs. The correction circuit uses a simple calibration ADC and digital filtering. It operates in the background and remains effective even for very low oversampling ratios.

  Objective(s): In SPECT, the sinogram contains scatter and lack of attenuated counts that degrade the reconstructed image quality and quantity. Many techniques for attenuation and scatter correction have been proposed. An acceptable method of correction is to incorporate effects into an iterative statistical reconstruction. Here, we propose new Maximum Likelihood Expectation Maximiz...

Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, NY, NY, USA Simultaneous MR/PET scanners allow for the exploration and development of novel PVE correction techniques without the challenges of coregistration of MR and PET. The development of a wavelet-based PVE correction method, to improve PET quantification, has proven successful in brain PET. We report ...

BACKGROUND Presbyopia if uncorrected causes inability to see and do near work. It is unavoidable as one ages. High school teachers whose work depends much on near work need proper and adequate correction of their presbyopia to increase effectiveness and efficiency. OBJECTIVES The aim was to determine the uptake of correction and prescription for presbyopia of presbyopic teachers of public Sen...

Despite the tremendous growth of microarray usage in scientific studies, there is a lack of standards for background correction methodologies, especially in single-color microarray platforms. Traditional background subtraction methods often generate negative signals and thus cause large amounts of data loss. Hence, some researchers prefer to avoid background corrections, which typically result ...

The terms “gamma” and “gamma correction” are well‐known to most graphics practitioners. They describe a fundamentally simple but some‐ times confusing method used in print, imaging and video technology, which also plays an impor‐ tant role in 3D computer graphics and composit‐ ing. Even though most have heard the terms be‐ fore, there are many misconceptions about gamma correction, especially i...