Signal variability in diffusion weighted imaging (DWI) is influenced by both thermal noise and spatially and temporally varying artifacts such as subject motion and cardiac pulsation. In this paper, the effects of DWI artifacts on estimated tensor values, such as trace and fractional anisotropy, are analyzed using Monte Carlo simulations. A novel approach for robust diffusion tensor estimation,...

BACKGROUND AND PURPOSE To determine which MR imaging sequences are necessary to assess for spinal metastases. METHODS Hypothetical MR imaging interpretations and management plans were made prospectively for consecutive adult cases acquired retrospectively. Standardized MR imaging protocols were independently interpreted by 2 neuroradiologists. MR imaging protocol types varied: 1) T1-weighted ...

Background. Usefulness and ability of diffusion and perfusion weighted magnetic resonance images (DWI and PWI) to detect intracerebral haemodynamic disturbance have not been fully evaluated.

BACKGROUND AND PURPOSE For MR perfusion-diffusion (PWI-DWI) mismatch to become routine in thrombolysis patient selection, rapid and reliable assessment tools are required. We examined interrater variability in PWI/DWI volume measurements and developed a rapid assessment tool based on the Alberta Stroke Program Early CT Scores (ASPECTS) system. METHODS DWI and PWI were performed in 35 patients...

Brand name confusion is one of the most common causes of drug-related errors. The aim of this study was to develop quantitative measures of similarity among brand names of drugs. We modified the fragmentary pattern-based measure, a measure of similarity for character strings based on the string resemblance system, to develop three novel measures of similarity, i.e., the head and tail-weighted f...

Participants named (Experiments 1-2) or categorized (Experiments 3-4) the picture or the word of picture-word compounds that varied in the relative saliency of the 2 components and in the correlation between them over the experimental trials. Picture-word interference (PWI) was gauged through Stroop and Garner effects. PWI was found to be malleable; its magnitude and very presence depending law...

The aim of this paper is to model the processes of the aggregation of weighted information in a linguistic framework. Three aggregation operators of weighted linguistic information are presented: linguistic weighted disjunction (LWD) operator, linguistic weighted conjunction (LWC) operator and linguistic weighted averaging (LWA) operator. A study of their axiomatic is presented to demonstrate t...

BACKGROUND Case-control studies are generally designed to investigate the effect of exposures on the risk of a disease. Detailed information on past exposures is collected at the time of study. However, only the cumulated value of the exposure at the index date is usually used in logistic regression. A weighted Cox (WC) model has been proposed to estimate the effects of time-dependent exposures...

Prostate cancer and prostatic calcifications have a high incidence in elderly men. We aimed to investigate the diagnostic capabilities of susceptibility-weighted imaging in detecting prostate cancer and prostatic calcifications. A total number of 156 men, including 34 with prostate cancer and 122 with benign prostate were enrolled in this study. Computed tomography, conventional magnetic resona...