Computerized Cat

August 16, 2013 | Uncategorized

The author describes despite, differently conventional radiology, method for which the radiation attenuated for the diverse ones weaveeed of the organism sensetizes you leave silver of the emulsion of the photographic film, incorporated to the gelatin of the film for process of revelation and chemical setting, in the Computerized Cat scan a funny pipe around of the patient emitting a colimado beam of rays X, that after to suffer attenuation for the organism, is caught by twinkle detectors, that are always in opposition and focus with the radiation source. As return a signal is produced electric that is sent to the computer, which, after a mathematical process, shows the anatomical image in a monitor. To each ash tone in the composition of the image a numerical value is attributed. These values are calculated always in relation to the coefficient of linear absorption of the water, for which are attributed numerical value zero, in a scale that can vary the used equipment in accordance with (approximately of +3000 the -1000). The fabric sseo would be in the highest positive band of the scale and the air of the respiratory ways and the digestive pipe in lowest (negative). In homage to the creator of the method, each one of the numbers of this scale had been called Unidades Hounsfield (UH). According to Frederiksen (1995), the typical technique of mapping is made with 332 but, 130kVp, matrix of the image of 512 x 512, sseo algorithm, 16 cm of field, index of the plan of 1 mm, thickness of the 2 cut of mm and angle of gantry of 0. Rodrigues (1997) affirmed that the image of Computerized Cat scan standard is a transversal axial sight, directed as if we looked at the patient of the ground for top. Installing the axial cuts inside of the memory of the computer, images from these reconstructions in different plans of the space, being the most common sagittal and coronal ones can be made, being able to be made three-dimensional reconstructions.

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