Introduction In radiography, dose and image quality are dependent on radiographic parameters. The problem is caused from incorrect use of radiography equipment and from the radiation exposure to patients much more than required. Therefore, the aim of this study was to implement a quality-control program to detect changes in exposure parameters, which may affect diagnosis or patient radiation do...

Digital radiographic imaging systems, such as those using photostimulable storage phosphor, amorphous selenium, amorphous silicon, CCD, and MOSFET technology, can produce adequate image quality over a much broader range of exposure levels than that of screen/film imaging systems. In screen/film imaging, the final image brightness and contrast are indicative of over- and underexposure. In digita...

The contrast enhancement technique used manipulates the DCT coefficients of a JPEG image to improve its quality. It is carried out in the decompression stage so that the compressibility of the image is not affected. Since DCT and its inverse transform IDCT are performed on 8 x 8 blocks of pixels, any image processing algorithm implemented in the transform domain produces flaws known as blocking...

Semantic image interpretation (SII) leverages Semantic Web ontologies for generating a mathematical structure that describes the content of images. SII algorithms consider the ontologies only in a late phase of the SII process to enrich these structures. In this research proposal we study a well-founded framework that combines logical knowledge with low-level image features in the early phase o...

A feasibility study of a novel PET-based molecular image guided radiation therapy (m-IGRT) system was conducted by comparing PET-based digitally reconstructed planar image (PDRI) registration with radiographic registration. We selected a pair of opposing parallel-plane PET systems for the practical implementation of this system. Planar images along the in-plane and cross-plane directions were r...

Today, there is a huge amount of data gathered about the Earth, not only from new spatial information systems, but also from new and more sophisticated data collection technologies. This scenario leads to a number of interesting research challenges, such as how to integrate geographic information of different kinds. The basic motivation of this paper is to introduce a GIS architecture that can ...

New digital detectors were developed for medical applications, which have the potential to substitute the X-ray film. Digital Detector Arrays (DDA: Flat Panel Detectors, Line Detectors) and Imaging Plates (Computed Radiography, CR) allow a fast acquisition of radiographic images with higher dynamic than film. Especially DDA’s allow a radiographic inspection with considerable higher image qualit...

In this paper we discuss our work with agent-based image processing systems, and describe work in progress applying these concepts to meteorological data sets, especially radar. Radar is particularly amenable to image processing, being structured in 2, 3 or 4 dimensions, and conveying reflectivity or velocity information. We discuss a number of existing meteorological radar image processing sys...