Purpose: The purpose of the current work was experimental investigations of the mean breast dose and volume dose distributions with and without adaptive filtration. Adaptive filtration of the x-ray beam is used in dedicated breast CT to reduce dynamic range requirements on the detector, and to improve image quality. The adaptive filter has a predetermined shape, it is placed after the x-ray sou...

The texture analysis of cancer cells leads to a procedure distinguish spatial differences within an image and extract essential information. This study used two test tumours images determine type, location, geometric characteristics (area, size, dimensions, radius, etc.). suggested algorithm was designed detect breast using the segmentation-based threshold technique. method Grey Level Size Zone...

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The Photo Response Non-Uniformity acts as a digital fingerprint that can be used to identify image sensors. This characteristic has been used in previous research to identify scanners, digital photo cameras and digital video cameras. In this paper we use a wavelet filter from Lukáš et al [1] to extract the PRNU patterns from multiply compressed low resolution video files originating from webcam...

A prominent characteristic of most catadioptric sensors is their lack of “uniformity of resolution”. While several sensors previously appearing in the literature have been described as “equi-resolution”, this is not the case, because they do not incorporate the concept of solid angle. We describe catadioptric sensors whose associated projections from the viewing sphere to the image plane are ar...

The continuous scanning mode in three-dimensional (3D) whole-body PET studies has the advantage of axial sensitivity uniformity over the majority of the axial FOV. However, this scan mode requires large data handling compared to conventional discrete scans. In this work, we have implemented and evaluated a new continuous 3D scan method using 'on-the-fly' Fourier rebinning. In this method, sinog...

Polymerase chain reaction (PCR) using micromachined structures promises improved temperature uniformity and cycling time together with decreased reagent and sample volumes. Thermal design of these structures will benefit from measurements of the temperature distribution in the reacting liquid. We report measurements of temperature uniformity and time constant in a microfabricated 18-vessel arra...

Colloidal self-assembly into highly ordered binary systems represents a versatile and inexpensive approach to generate well defined surface topographical features with submicron resolution. In addition, the use of surface-functionalized particles where each particle bears a different surface functionality enables the generation of highly resolved surface chemical patterns. Such topographical, a...

The dynamism of sociogeographic and historical processes and trends represents a key factor in the creation and uniformity of regions, and in their image and perception in the eyes of the publ ic and scholars. As a basic geographic concept, a region is the result of al l preceding and actual spatial relations arising from natural conditions, and those arising from pol itical , administrative an...