The aim of this study was to explore the correlations of detectability and the semi-quantification for hot spot imaging with positron emitters in positron emission tomography (PET) and with a positron coincidence detection system (PCD). Phantom study results for the measurement of the lesion-to-background (L/B) ratio ranged from 2.0 to 30.3, and detectability for hot spot lesion of PET and PCD ...

[1] The Io footprint (IFP) is the auroral signature of the electromagnetic interaction between Io and Jupiter’s magnetosphere. It consists of several spots followed by an extended tail, which are located close to the feet of the magnetic field lines connecting Io to Jupiter. The size of the main spot is a controversial issue, and previously published values range from ∼400 to ∼8000 km. However,...

The capability to perform multicolor, wide field-of-view (FOV) fluorescence microscopy imaging is important in screening and pathology applications. We developed a microscopic slide-imaging system that can achieve multicolor, wide FOV, fluorescence imaging based on the Talbot effect. In this system, a light-spot grid generated by the Talbot effect illuminates the sample. By tilting the excitati...

BACKGROUND AND PURPOSE Recent studies of intracerebral hemorrhage treatments have highlighted the need to identify reliable predictors of hematoma expansion. Several studies have suggested that the spot sign on computed tomographic angiography (CTA) is a sensitive radiological predictor of hematoma expansion in the acute phase. However, the spot sign has low sensitivity for hematoma expansion. ...

OBJECTIVE To determine the effect of the axial length of the eye on laser spot size and irradiance. DESIGN Experimental study using a calibrated Gullstrand-type model eye. METHODS The model eye, which was fitted with a scale of half circles in the center of the artificial fundus, was first examined using 2 different fundus imaging systems, then with a setup of a slitlamp, 2 indirect condens...

Submitted for the MAR07 Meeting of The American Physical Society Confounding Effect of Spot-Size on the Wavelength-Dependence of Tissue Ablation Metrics1 M. SHANE HUTSON, GILMA ADUNAS, YAOWU XIAO, Vanderbilt University — Tunable free-electron lasers have been used in several previous studies to investigate the mid-IR wavelength-dependence of tissue ablation. These studies gave conflicting resul...

The spot model has been developed by Bazant and co-workers to describe quasistatic granular flows. It assumes that granular flow is caused by the opposing flow of so-called spots of excess free volume, with spots moving along the slip lines of Mohr-Coulomb plasticity. The model is two-dimensional and has been successfully applied to a number of different geometries. In this paper we investigate...

W ith the recent surge of interest in wave-front sensing technology as a new diagnostic tool in refractive surgery 1,2 , the concept of wavefront customized correction has now come to the forefront. 3,4 Among the companies leading this effort, the Summit-Autonomous Technologies provides a technology platform within CustomCornea which can be used as a model for wavefront ablation requirements. A...