Boots – shoes – and leggings
Patent
1991-06-20
1994-03-08
Envall, Jr., Roy N.
Boots, shoes, and leggings
G06F 1500
Patent
active
052933121
ABSTRACT:
Apparatus and method for mounting on an existing x-ray simulator and calculating a back projected computed tomographic image. The detector array is linear and outputs signals from the photodiodes mounted therein to a preprocessor for smoothing, correcting and filtering and subsequent processing to transform the signal from that produced by an x-ray originating from a fan beam source, e.g., in a polar coordinate system, into the signal which would have been produced by a detector in an array on which a parallel beam is incident on a Cartesian coordinate system. The transformed data is converted to a gray scale value for a picture element having a specific position in the Cartesian coordinate system and output to an appropriate display. Data is taken at each incremental angle as the beam source and detector array rotate around a target object.
The method of reconstructing this back projected image involves correcting and smoothing the output signals, scaling those corrected and smoother signals, and convolving the scaled signals into data characterizing the ray which is incident on each individual detector element into the equivalent intensity data had the incident ray originated from a parallel beam source. Also provided are methods of correcting for off-center rotation of x-ray source and detector array.
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Bai Ari M.
Envall Jr. Roy N.
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