Background: Epidemiological studies show that computed tomography (CT) is one of the main sources of ionizing radiations. Shielding of radiosensitive organs is one of the dose reduction methods. This study aimed to assess the eye lens dose reduction and image quality resulting from the use of radio-protective bismuth shield in brain CT imaging. Methods: Bismut...

ABTRACT Background: In nuclear medicine, phantoms are mainly used to evaluate the overall performance of the imaging systems and practically there is no phantom exclusively designed for the evaluation of the software performance.  In this study the Hoffman brain phantom was used for quantitative evaluation of reconstruction techniques. The phantom is modified to acquire t...

in today's competitive environment, branding is considered as a mechanism to help businesses in order to achieve competitive advantages. due to perceived service quality, business image and customer trust, branding, as an important concept in the sports marketing, is created for organizations. the aim of this study was to investigate the relationship between perceived service quality and c...

introduction: in islamic countries in the month of holy ramadan many muslims based on their religious legislation refuse fluid intake during the fasting time though instructed to drink after injection of tc-99m methylene-diphosphonates [tc-99m mdp] used for skeletal scintigraphy. we aimed to establish whether fluid restriction in tc-99m mdp skeletal scintigraphy has an impact on its quality. me...

New technology is continuously proposed in the printing technology, and as a result the need to perform quality assessment is increasing. Subjective assessment of quality is tiresome and expensive, the use of objective methods have therefore become more and more popular. One type of objective assessment that has been subject for extensive research is image quality metrics. However, so far no on...

A Gaussian membership function to model image information in spatial domain has been proposed in this paper. We introduce a new contrast intensification operator, which involves a parameter t for enhancement of color images. By minimizing the fuzzy entropy of the image information, the parameter t is calculated globally. A visible improvement in the image quality for human contrast perception i...

In this paper, we present a study in which we analyze digital image quality corrections performed by an expert operator at the National Gallery of Art (N.G.A.) in Washington, D.C., and we propose a framework to semiautomatically improve the quality of digital images in museum collections. The work presented has two goals: (1) to explore ways to facilitate the color image correction process, and...

This review is focused on image quality model building, particularly in the context of the Image Quality Circle. There are two fundamentally different ways to modeling image quality; the impairment approach and the quality approach. Impairment looks at decreases in image quality from some reference or ideal. The quality approach attempts to model the judgment of image quality directly, independ...

A number of image quality metrics are based on psychophysical models of the human visual system. We propose a new framework for image quality assessment, gathering three indexes describing the image quality in terms of visual performance, visual appearance, and visual attention. These indexes are built on three vision models grounded on psychophysical data: we use models from Mantiuk et al. (vi...

Background: Body image is an integral component of the self-concept that significantly shapes human functioning and people’s life outcomes. Although negative body image is well-studied, there is little research on positive body image. The study examined the basic characteristics of positive body image intending to standardize a scale for it.  Methods: The study used using an exploratory resear...