Method and apparatus for calibrating and correcting magnetic and

Details Method and apparatus for calibrating and correcting magnetic and Method and apparatus for calibrating and correcting magnetic and

1990-10-05

1993-08-10

Cosimano, Edward R.

Boots, shoes, and leggings

36441318, 25036309, 378 7, 378 70, G06F 1500

Patent

active

052355284

ABSTRACT:
A method and apparatus to calibrate and correct magnetic and geometrical distortions in an imaging system, specifically a computer tomography (CT) system, includes a calibration object which is placed on the surface of an image intensifier. An image frame of the calibration object is generated, and a vertical correction table is generated corresponding to the amount of image distortion caused to the image frame of the calibration object. The image frame is corrected using the vertical correction table, and the corrected image frame data is summed or averaged and either stored for further transformation into a slice image or used to generate a horizontal correction table to correct distortions in the horizontal direction. Once the vertical and horizontal correction tables have been generated using the calibration object, subsequent image frames are corrected using the correction values in the correction tables.

REFERENCES:
patent: 4149079 (1979-04-01), Ben-Zeev et al.
patent: 4280178 (1981-07-01), Nassi et al.
patent: 4403289 (1983-09-01), Lux et al.
Chakraborty, "Image Intensifier Distortion Correction," Med. Phys. 14(2), (Mar./Apr. 1987).
Boone et al., "Analysis and Correction of Imperfections in the Image Intensifier TV-Digitizer Imaging Chain," 75th Annual Meeting of the Radiological Society of North America (Nov. 27, 1989, Chicago).

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