PURPOSE This study quantified preschool children's optical quality in terms of their aberrations and modulation transfer function (MTF), and examined the dependence of MTF on pupil size and grating orientation. METHODS Aberrometry was used to measure Zernike coefficients in 34 Chinese preschool children (18 males, 16 females; aged 4.95-6.89 years; mean, 5.91 +/- 0.56). For each subject, after...

PURPOSE The aim of this study was to measure the image quality of a digital breast tomosynthesis (DBT) system quantitatively. MATERIALS AND METHODS The signal transfer property (STP), modulation transfer function (MTF), noise power spectrum (NPS), and detective quantum efficiency (DQE) of the Hologic Selenia Dimensions breast tomosynthesis system were measured according to established methods...

Abstract Sexuality and intimacy are important aspects of life that frequently compromised after severe injury or illness, yet these often overlooked by medical rehabilitation professionals. This case series describes the Occupational Therapy Intimacy program at a Military Treatment Facility (MTF). Three diverse clients with range physical, cognitive emotional impairments were chosen to illustra...

The importance and accuracy of the human visual system have led scientists researchers to do their best study it, know its problems, how treat them. eye lens tilt is possibly due a specific accident such as blow or like. So, this manuscript was submitted tilting effect on performance determine tolerance values. Using (ZEMAX-EE) software program relying Liou Brennan model Eye (LBME), one most ac...

The modulation transfer function (MTF) and the noise power spectrum (NPS) are widely recognized as the most relevant metrics of resolution and noise performance in radiographic imaging. These quantities have commonly been measured using various techniques, the specifics of which can have a bearing on the accuracy of the results. As a part of a study aimed at comparing the relative performance o...

The aim of our work was to provide a robust method for evaluating imaging performance of positron emission tomography (PET) systems and particularly to estimate the modulation transfer function (MTF) using the line spread function (LSF) method. A novel plane source was prepared using thin layer chromatography (TLC) of a fluorine-18-fluorodeoxyglucose ((18)F-FDG) solution. The source was placed ...

The progression of many human neurodegenerative disorders is associated with an accumulation of alpha-synuclein. Alpha-synuclein belongs to the homologous synuclein family, which includes beta-synuclein. It has been proposed that beta-synuclein may be a natural regulator of alpha-synuclein. Therefore controlling beta-synuclein expression may control the accumulation of alpha-synuclein and ultim...

Single-point diamond turning (SPDT) is widely used in the machining of infrared materials and metal-based mirrors. Diamond tips can scratch material, replicate shape tip, create annular marks on optical surfaces, which have unpredictable adverse effects imaging. In order to predict effect diffraction degradation imaging quality, a model influence SPDT processing parameters reduction system MTF ...

Should computer-based study tasks use multiple-choice or constructed-response question formats? It was hypothesized that a constructed-response study task (CR) with feedback would be superior to multiple-choice study tasks that allowed either single or multiple tries (STF and MTF). Two additional recognition study task treatments were included that required an overt constructed response after f...

Non-alcoholic fatty liver disease (NAFLD) is a burgeoning health problem that affects 1/3 of the adult population and an increasing number of children in developed countries. Oxidative stress and insulin resistance are the mechanisms that seem to be mostly involved in its pathogenesis. This study was conceived in a NAFLD rat model to evaluate the efficacy of both metformin (MTF) and N-acetylcys...