Registers – Transfer mechanism – Traveling pawl
Patent
1975-11-28
1977-08-23
Wise, Edward J.
Registers
Transfer mechanism
Traveling pawl
364300, 250445T, 250369, G01T 116, G06F 1552
Patent
active
040442403
ABSTRACT:
A transverse section tomography system has an ultra-high-speed data processing unit for performing back projection and updating. An X-ray scanner directs X-ray beams through a planar section of a subject from a sequence of orientations and positions. The scanner includes a movably supported radiation detector for detecting the intensity of the beams of radiation after they pass through the subject. The detector generates a series of scan data signals representative of the detected intensities. The data processing unit is coupled to the scanner and operates on the scan data signals to produce a set of filtered scan data signals representative of the contribution of each of the scan data signals towards reconstructing an image of the planar section of the subject.
The data processing unit includes a scan storage section for retrievably storing the filtered scan signals in scan storage locations corresponding to predetermined beam orientations. An array storage section is provided for storing image signals as they are generated. The image signals are stored in array storage locations coordinated with a preselected array of points of the planar section. The image signals are each successively updated to eventually represent the density of the planar section at each of the selected array of points. The processing unit also includes array storage and scan storage address calculators. The array storage address calculator determines, on a row-by-row basis, the addresses of the array storage locations corresponding to points of the planar section. The scan storage address calculator calculates the addresses of the scan storage locations containing the filtered scan signals which contribute to the reconstruction of the image at the points determined by the array storage address calculator. A reconstruction updating unit is provided for combining the addressed filtered scan signal with the addressed image signal to provide the updated image signal. According to one feature, a control unit is provided for operating the scan storage address calculator concurrently with the array storage address calculator for minimizing overall data processing time. According to another feature, the array storage section is equipped with addressing and data transfer circuitry which is operated concurrently with at least one of the address calculators for writing the updated image signal into the appropriate array storage location.
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Cox, Jr. Jerome P.
Gerth, Jr. Vernon W.
Picker Corporation
Wise Edward J.
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