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...

A three-dimensional reconstruction method for simultaneous compensation of attenuation, scatter and distance-dependent detector response for single photon emission computed tomography is described and tested by experimental studies. The method determines the attenuation factors recursively along each projection ray starting at the intersected source voxel closest to the detector. The method sub...

ID: 14214 Title: A novel scatter reduction and correction method to improve cone-beam CT (CBCT) image quality Purpose: To develop a novel scatter reduction and correction method to improve the CBCT image quality for IGRT applications. Method and Materials: A one-dimensional grid composed of lead with equal interspacing was positioned between the x-ray source and the imaging object during CBCT a...

' Corresponding author. Abstract Scatter Plots are one of the most powerful and most widely used techniques for visual data exploration. A well-known problem is that scatter plots often have a high degree of overlap, which may occlude a significant portion of the data values shown. In this paper, we propose th e generalized scatter plot technique, which allows an overlap-free representation of ...

To reduce the prohibitive efforts associated to problem-solving ITS, a domain-independent framework can be developed. In this paper, we compare ASTUS to the MTT architecture with examples drawn from a scatter plot tutor. We show that both approaches are similar, but that an ASTUS tutor can exhibit a more sophisticated tutoring behavior thanks to its “pedagogical knowledge model”.

In this paper we look at the problem where we have two mixed sets of data on the same scatter plot. We want to calculate linear regression lines for each of the two sets, but first of all we need to decide which data belong to which set. We propose one possible solution to this problem involving data classification and parameters estimation.

This paper describes the extension of a multivariate scatter plot for qualitative use. The plot combines effective diagramming practices and modified axis dimensions to cohesively summarize qualitative analysis in the early, unstructured stages of design. The rugplot is a flexible tool that improves understanding of the “hard” limits of the problem, self-imposed “false” constraints, and directi...

(a) Using R, fit 3 binomial GLMs for these data corresponding to 3 link functions, logit, probit, and complementary log-log. Perform residual analysis for each model, using the deviance residuals. Obtain fitted values, π̂i, under each model and compare with observed proportions, yi/mi. Obtain the estimated dose-response curve under each model by evaluating π̂(x) = g(β̂1 + β̂2x) over a grid of value...

Pseudosasa amabilis (McClure) (Poales: Gramineae) is a typical bamboo species naturally distributed in large area of south China and famous for its culm strength. Although bamboos were found to share the same development rule, the detailed internode morphology of bamboo culm was actually not fully expressed. We explored internode morphology of P. amabilis using 11 different physical parameters ...

Boxplots and variants thereof are frequently used to compare univariate data. Boxplots have the disadvantage that they are not easy to explain to non-mathematicians, and that some information is not visible. A beanplot is an alternative to the boxplot for visual comparison of univariate data between groups. In a beanplot, the individual observations are shown as small lines in a one-dimensional...