The development of new MRI technologies has favoured the use of sequences that significantly improve the spatial resolution of this imaging method, thus yielding thin-section images that allow volumetric analysis. We present our experience at Clínica Vespucio, Santiago, Chile, related to a routine knee MRI protocol performed on 45 patients who underwent conventional proton density-weighted fat-...

The inevitable depletion of mineral resources, the constant deterioration of the geological and mining conditions for the development of mineral deposits and the restoration of raw materials from mining waste by recycling are all urgent problems we face today. The solution to this problem may ensure: a considerable extension of raw material source; decrease of investments in opening new deposit...

OBJECTIVE To describe the thin-section CT findings of arc-welders' pneumoconiosis. MATERIALS AND METHODS Eighty-five arc-welders with a three to 30 (mean, 15)- year history of exposure underwent thin-section CT scanning. The extent of abnormalities detected was correlated with the severity of dyspnea and pulmonary function tests. For comparison, images of 43 smoking males (mean 25 pack-year) ...

In considering the electron microscopic study of sections of tissue as a practical approach to the study of cell structure, the cytologist is faced with a number of possible decisions with respect to the way in which he will prepare his material. Not the least of these is the problem of how thin the section of tissue should be to serve his purpose. A useful section of a sample must satisfy the ...

Introduction Electron microscopic (EM) tomography is proving useful for examining the organization of protein molecules in large molecular machines at critical neural sites, such as synapses. Methods are still in a state of flux, and many steps exist between a neuron and a molecular model of one of its synapses. Here, we show our approach for doing tomography on synaptic structure , hoping ther...

Ornstein (1956) has recently discussed the maximum useful thickness of a section for electron microscopy, as limited by the energy loss of the beam in traversing it and by the chromatic aberration of the objective lens. For working voltages of 50 to 60 kv. his conclusion is almost identical with that which we initially established experimentally (Cosslett, 1951) and later supported by theoretic...

there have been some experimental tests on hollow curved-steel struts with thin-walled square sections, in order to investigate their general behavior, particularly their capacity for bearing differing loads. one set of square tubes are cold-formed into segments of circular arcs with curvature radii, equal to 4000 mm. different lengths of curved struts are fabricated so as to cover a practical ...

This paper introduces the mechanical behavior of precise straightening thin-walled members systematically. As a result of its cross section characteristics of the thin-walled members, traditional straightening theory does not work well in the straightening process of this kind of metal bar stock. Considering the stress evolvement of section during the straightening process, a model was built to...

the qom formation in ghohrud area, have been investigated in order to determine its biostratigraphy and palaeoecology. the thickness of qom formation is 325 meters at the study area and consists of thin, medium to thick bedded and massive limestons. they underline on eocene volcanic with disconformably and its upper boundary is overlain by alluvium. based on thin section studies 14 genera and 2...

OBJECTIVE To compare the clinical utility of the different imaging techniques used for the evaluation of tracheobronchial diseases. MATERIALS AND METHODS Forty-one patients with tracheobronchial diseases [tuberculosis (n = 18), bronchogenic carcinoma (n = 10), congenital abnormality (n = 3), post-operative stenosis (n = 2), and others (n = 8)] underwent chest radiography and spiral CT. Two se...