We describe a methodology for the analysis of radiographic images which is based on two major techniques: (1) qualitative geometric abstraction and (2) ontological analysis of anatomical structures. The first technique is a bottom-up approach to extract qualitative spatial relations from medical radiographic images and the second technique is a top-down approach to determine which qualitative r...

In recent years new digital x-ray radiographic and fluoroscopic systems based on large-area flat-panel technology have revolutionized our capability of producing x-ray images. However, such imagers are extraordinarily expensive and their rapid image acquisition capability is not required for many applications such as radiography. Here we report a novel approach to achieve a high-quality digital...

We presume that the reader understands conventional radiography in which photographic methods capture radiographic images. Typically, a patient is positioned between an x-ray source and a film/screen cassette. The cassette contains an intensifying screen which, when exposed to radiation, emits light which exposes a photographic emulsion. The photographic film can be developed to provide an imag...

A quality assurance program in radiology provides the basis for systematic measurement of various parameters which affect the quality and production of a radiographic image. We have outlined a program which can be implemented in dental offices by dentists or auxiliary personnel without sophisticated instruments. Tests designed to establish the adequacy of specific functions are described togeth...

INTRODUCTION Although the development of CT have represented a landmark in diagnostic imaging, its use in Dentistry turned out very discretely over the years. With the appearance of programs for analysis of three-dimensional images, specific for Orthodontics and Orthognathic surgery, a new reality is being built. OBJECTIVE The authors of this study aim to inform the orthodontic society of fun...

Before automatic exposure control was fitted to diagnostic X-ray sets, radiographers were faced with the problem of choosing the parameters that would give the best radiographic image. For a new X-ray set whose performance was unknown, this was no easy matter, and often required considerable trial and error because of the number of variables involved. To reduce the amount of work, special slide...

The radiographic image is the bidimensional projection of a tridimensional volume. Interpretation of such an image is sometimes uneasy as we cannot determine ot which level the shadows are located. To dissociate the superimposed shadows, the radiologist may rely on different techniques including fluoroscopy, profile view, radiosteoroscopy, conventional tomography, transverse axial tomography or...

In non destructive testing by radiography, a perfect knowledge of the weld defect shape is an essential step to appreciate the quality of the weld and make decision on its acceptability or rejection. Because of the complex nature of the considered images, and in order that the detected defect region represents the most accurately possible the real defect, the choice of thresholding methods must...

The amount of multimedia and visual data generated throughout the different fields is growing rapidly; a fact that has raised the need for a method which allows searching and accessing the provided data both quickly and easily, since querying data repositories must not be based solely on simple text. This paper presents the Medical Content-Based Image Retrieval (MCBIR) that introduces a unique ...

Continuous carbon fiber reinforced aluminum matrix composite materials (Cf/Al) contains manufacturing abnormalities such as shrinkage void, shrinkage porosity and delamination. Fundamental characteristics of the defects in Cf/Al were investigated through the correlation of radiographic image and microstructure of the composites. Hole-style penetrameter was designed and manufactured to help quan...