Conventional radiography seeks to produce, at each location in the image plane, a measure of the x-ray absorption of the object. In this paper, we present a method of determining a much more complete object description at each point, namely the intensity distribution (as a function of angle) of the emerging x-ray beam. From this distribution one can compute many different images, depicting the ...

Extraction of bone contours from x-ray images is an important first step in computer analysis of medical images. It is more complex than the segmentation of CT and MR images because the regions delineated by bone contours are highly nonuniform in intensity and texture. Classical segmentation algorithms based on homogeneity criteria are not applicable. This paper presents a model-based approach ...

A new method for shape analysis of X-ray images of human hand bones for estimation of bone maturity is proposed. To handle low contrast and non-uniformity of X-ray images, we design stable pre-processings to enhance images. The contour extraction method is based on local force control of a connected contour for deforming so as to fit it to an outline of a piece of bone. As a result with real im...

A system enabling both x-ray fluoroscopy and MRI in a single exam, without requiring patient repositioning, would be a powerful tool for image-guided interventions. We studied the technical issues related to acquisition of x-ray images inside an open MRI system (GE Signa SP). The system includes a flat-panel x-ray detector (GE Medical Systems) placed under the patient bed, a fixed-anode x-ray t...

a5.2 year-old holstein cow was presented with lameness andabnormal weight bearing in a slaughterhouse. widening of theperiople and swelling of the heel area in the lateral claw was morepermanent than the medial claw. vertical fissure (vf) involvingthe coronary band to the middle of the dorsal wall of the medialhind claw was observed. it was also extended to the bearingsurface in the inner surfa...

AIMS This study used dried human mandibles and aimed to assess the effect of different horizontal condylar angle and the effect of different beam angles from three different units in the depiction of medial, central and lateral parts of the condyle on panoramic and lateral temporomandibular joint (TMJ) panoramic images. METHODS Standard panoramic and lateral TMJ panoramic images of four dried...

introduction: misdiagnosis and the resulting mismanagement are challenging issues in complicated cases which present with obscure complaints. interpreting radiologic studies, especially conventional plain radiologic images, remains the most frequently prescribed and useful modality for the first step of assessment. case presentation: in this report, we present a case of mismanagement of a stran...

OBJECTIVES Phase-contrast imaging is a novel X-ray based technique that provides enhanced soft tissue contrast. The aim of this study was to evaluate the feasibility of visualizing human carotid arteries by grating-based phase-contrast tomography (PC-CT) at two different experimental set-ups: (i) applying synchrotron radiation and (ii) using a conventional X-ray tube. MATERIALS AND METHODS Fi...

Improvements in image quality and quantitation measurement, and the addition of detailed anatomical structures are important topics for single-photon emission tomography (SPECT). The goal of this study was to develop a practical system enabling both nonuniform attenuation correction and image fusion of SPECT images by means of high-performance X-ray computed tomography (CT). A SPECT system and ...

background and aims. radiography is used to diagnose the demineralization process and carious lesions; however, conventional radiography and direct digital images do not show these lesions when the amount of demineralization is less than 40%. digital subtraction radiography has recently been used to improve the diagnostic quality of these lesions. the purpose of this study was to compare the ca...