Registers – Transfer mechanism – Traveling pawl
Patent
1975-11-28
1977-08-16
Wise, Edward J.
Registers
Transfer mechanism
Traveling pawl
250369, 250445T, 364300, G01T 116, G06F 1552
Patent
active
040428117
ABSTRACT:
A transverse section tomography system has an ultrahigh-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 data processing unit includes a scan storage section for retrievably storing a set of 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, the scan storage address calculator embodies relative addressing for calculating successive addresses. A scan address register is provided for storing each scan address as they are calculated. A delta scan address register stores a DELTA value representative of the difference between scan storage locations representing successive ones of the points to be updated. The updating unit combines the DELTA value with the previous scan storage address to provide the next in-sequence scan storage address.
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Brunnett Carl J.
Gerth, Jr. Vernon W.
Picker Corporation
Wise Edward J.
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