Introduction: The key characteristics of positron emission tomography (PET) are its quantitative capability and its sensitivity, which allow the in vivo imaging of biochemical interactions with small amounts of tracer concentrations. Therefore, accurate quantification is important. However, it can be sensitive to several physical factors. The aim of this investigation is the assessment of the e...

Introduction: In radionuclide imaging, object scatter is one of the major factors leading to image quality degradation. Therefore, the correction of scattered photons might have a great impact on improving the image quality. Regarding this, the present study aimed to determine the main and sub-energy windows for triple energy window (TEW) scatter correction method usin...

In the article by Ingeman et al, “Lifestyle Factors and Early Clinical Outcome in Patients With Acute Stroke: A Population-Based Study,” which published online ahead of print on January 16, 2017, and appeared in the March 2017 issue of the journal (Stroke. 2017;48:611–617. DOI: 10.1161/STROKEAHA.116.015784), a correction is needed. On page 611, the corresponding author’s e-mail address is incor...

Sediment rating curve (SRC) is a conventional and a common regression model in estimating suspended sediment load (SSL) of flow discharge. However, in most cases the data log-transformation in SRC models causing a bias which underestimates SSL prediction. In this study, using the daily stream flow and suspended sediment load data from Shalman hydrometric station on Shalmanroud River, Guilan Pro...

A novel method for the calculations of 1-octanol/water partition coefficient (log P) of organic molecules has been presented here. The method, SLOGP v1.0, estimates the log P values by summing the contribution of atom-weighted solvent accessible surface areas (SASA) and correction factors. Altogether 100 atom/group types were used to classify atoms with different chemical environments, and two ...

introduction. several studies have shown that the effective educational attendance of faculty members have been substantially decreased. this is due to many different factors. lack of a comprehensive analysis of this issue has led the university managers to implement ineffective, arbitrary strategies to force the faculty members to increase their attendance in the educational activities. in ord...