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Method and apparatus for automatically centering an object for tomodensitometric examination
Method and apparatus for automatically centering an object for tomodensitometric examination
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机译:自动对中以进行光度法检查的对象的方法和设备
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摘要
A tomodensitometric apparatus for the radiological examination of an object by relative rotation with respect to said object of a fixed array consisting of a source of penetrating radiation and a plurality of detectors disposed along a line. In order to correctly position the object in the center of the radiation field prior to the examination and without subjecting the object to a dose of test radiation, the invention provides a movable screen which is placed between the source and the object to be examined. The dimensions of the screen are such as to prevent the radiation emanating from the source from reaching any but at least one of the two outermost-lying detectors in the line of detectors. When the array is rotated in a test cycle, the signals from the one or two outermost detectors are received by a suitably programmed computer which generates a displacement schedule that is transmitted to the controller and displaces the object in the direction necessary to move it to the center of the radiation field.
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