A 57-year-old woman experienced bilateral acute ischemic optic neuropathy after spine surgery. Routine MR imaging sequence, T2-weighted image, showed subtle high signal intensity on bilateral optic nerves. A contrast-enhanced T1 weighted image showed enhancement along the bilateral optic nerve sheath. Moreover, diffusion-weighted image (DWI) and an apparent diffusion coefficient map showed mark...

BACKGROUND AND PURPOSE To our knowledge, no method satisfactory for clinical use has been developed to visualize white matter fiber tracts with diffusion-weighted MR imaging. The purpose of this study was to determine whether superposition of a spin-echo T2-weighted image and a color-coded image derived from three orthogonal diffusion-weighted images could show fiber tract architecture of the b...

Lack of biodiversity data is a major impediment to prioritizing sites for species representation. Because comprehensive species data are not available in any planning area, planners often use surrogates (such as vegetation communities, or mapped occurrences of a well-inventoried taxon) to prioritize sites. We propose and demonstrate the effectiveness of predicted rarity-weighted richness (PRWR)...

INTRODUCTION Congenital pericardial cysts are benign lesions that arise from the pericardium during embryonic development. The diagnosis is based on typical imaging features, but atypical locations and signal magnetic resonance imaging sequences make it difficult to exclude other lesions. Diffusion-weighted magnetic resonance imaging is a novel method that can be used to differentiate tissues b...

Picture 1. Difusion-weighted image (TR4500, TE105) showed a hyperintense lesion in the left striatum and multiple smal hypointense lesions in the brain stem, the cerebelum, and the thalamus (Picture 1 A-D). Gradient-echo T2*-weighed image (TR540, TE18) demonstrated multiple hypointense lesions in the same areas as the DWI showed multiple hypointense lesions (Picture 1 EH). T2-weighted image (TR...

Secondary trait genetic association provides insight into the genetic architecture of disease etiology but requires caution in estimation. Ignoring case-control sampling may introduce bias into secondary trait association. In this paper, we compare the efficiency and robustness of various inverse probability weighted (IPW) estimators and maximum likelihood (ML) estimators. ML methods have been ...

1Former Professor and Head, 2Resident, 3Assistant Professor, 4Resident, Department of Medicine, SMS Medical College, Jaipur Received: 24.06.2013; Revised: 14.02.2014; Accepted: 14.02.2014 (a) (b) Fig. 1: MRI of the brain showing hyperintensities in the splenium of corpus callosum the “bommerang sign” in (a) T2W FLAIR (Fluid Attenuated Inversion Recovery) and (b) DWI (Diffusion Weighted Image) s...

Incidental finding of pancreatic focalities has increased thanks to a larger use of radiological examinations (Ultrasound, CT). The differential diagnosis between focal inflammatory and heteroplastic disease is frequently complicated by the wide spectrum of lesions and by the aspecificity of clinical and medical history, as well as of imaging findings. MRI is the second level choice of examinat...

Complex networks have attracted growing attention in many fields. As a generalization of fractal analysis, multifractal analysis (MFA) is a useful way to systematically describe the spatial heterogeneity of both theoretical and experimental fractal patterns. Some algorithms for MFA of unweighted complex networks have been proposed in the past a few years, including the sandbox (SB) algorithm re...

PURPOSE – Conventional fibre tracking techniques estimate the fibre directions in all voxels and then use a local stepping method to track the entire pathway. However, the sensitivity of these techniques to local estimation errors is a well-known issue, as well as ambiguous fibre configurations arising from the symmetry of the DWI data [1,2]. Global fibre tracking methods [2–5], on the other ha...