Arithmetic unit for a computed tomography apparatus

Details Arithmetic unit for a computed tomography apparatus Arithmetic unit for a computed tomography apparatus

1997-04-17

1998-09-01

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, 382131, A61B 603

Patent

active

058021353

ABSTRACT:
An arithmetic unit for a computed tomography apparatus has special hardware in the form of a processor, a median filter ASIC, an angle clipping ASIC and two memories are employed. In the median filter ASIC, for each pixel a determination of increments for generating a supporting point address are made by the processor, the access addresses are calculated and the supporting points are addressed from a first of the memories and a median value formation is undertaken in the median filter ASIC, followed by a difference image production in the median filter ASIC. In the angle clipping ASIC, a determination is made of the coordinates of each pixel with reference to a rotational center in the processor, and supporting points are generated and accumulated from the difference image resulting from the median filtering, and a resultant image is generated in the angle clipping ASIC.

REFERENCES:
patent: 4463375 (1984-07-01), Macovski
patent: 5703920 (1997-12-01), Wohlrab et al.

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