OBJECTIVE To determine the potential value of distributional-phase T1-weighted ferumoxides-enhanced magnetic resonance (MR) imaging for tissue characterization of focal liver lesions. MATERIALS AND METHODS Ferumoxides-enhanced MR imaging was performed using a 1.5-T system in 46 patients referred for evaluation of known or suspected hepatic malignancies. Seventy-three focal liver lesions (30 h...

The detection of coal/shale interfaces close to the surface using ground penetrating radar (GPR) is difficult because the echo is drowned in unwanted signal components. These components are susceptible to changes in amplitude and cannot be removed well by standard preprocessing techniques. Second order correlation based methods such as matched filtering fail to locate the echo reliably under th...

The ultrasonographic characteristics of hepatocellular carcinomas (HCC) were investigated. Four typical features of HCCs, "mosaic internal echo pattern", "halo", "lateral shadow" and "posterior echo enhancement", were not recognized in minute HCCs smaller than 2 cm in diameter. These characteristics developed as the tumors grew. Only hypoechoic space-occupying lesions can be considered as small...

V838 Mon has undergone one of the most mysterious stellar outbursts on record, with (a) a large amplitude (∆B∼10 mag) and multi-maxima photometric pattern, (b) a cool spectral type at maximum becoming cooler and cooler with time during the descent, until it reached the never-seen-before realm of L-type supergiants, never passing through optically thin or nebular stages, (c) the development of a...

The word “adenomatous hyperplasia of rete testis” (AHRT) was used by M. Nistal et Al. for the first time in an article about the cystic dysplasia of the testis (1976). AHRT is a benign lesion of the testis. The patient who came to our attention was studied with a testicular echo color Doppler that identified a solid, well circumscribed and hypoechoic mass of 4.5 x3.8mm as diameter, localized in...

Periventricular hyperintensity was identified using long repetition and echo times in spin-echo magnetic resonance imaging of patients with white-matter disease (e.g., multiple sclerosis) caused by local demyelination and in hydrocephalic patients caused by transependymal migration of spinal fluid. A review of 365 consecutives studies revealed that some degree of periventricular hyperintensity ...

BACKGROUND Differentiating between benign and malignant submucosal tumors is difficult. Moreover, the natural course of benign-appearing SMTs is not clearly elucidated. OBJECTIVES To evaluate the natural course of upper gastrointestinal SMTs by endoscopic endosonography. METHODS We followed 25 consecutive patients with small (< 40 mm) SMTs for a mean period of 19 months. Evaluation included...

Echo State Networks (ESNs) is a recent simple and powerful approach to training recurrent neural networks (RNNs). In this report we present a modification of ESNs-time warping invariant echo state networks (TWIESNs) that can effectively deal with time warping in dynamic pattern recognition. The standard approach to classify time warped input signals is to align them to candidate prototype patte...

In acute ischemia or infarction, role of scintigraphy (technetium thallium scan), SPECT and cardiac MRI is well documented. These modalities are useful in detecting at-risk, ischemic, infarcted, nonviable and scarred regions of myocardium. The abnormal area appears as a region of hypoperfusion or cold spot with or without dyskinesia. 2Dechocardiography (ECHO) is very useful in assessing the sta...