Method for fan beam helical scanning using rebinning

Details Method for fan beam helical scanning using rebinning Method for fan beam helical scanning using rebinning

1989-11-22

1993-06-01

Envall, Jr., Roy N.

Boots, shoes, and leggings

36441318, G06F 1500

Patent

active

052166015

ABSTRACT:
A method of reducing image artifacts in images acquired with fan beam, helical scanning, tomographic imaging systems rebins the fan beam data into parallel beam projection sets. Data is spliced from first areas of the parallel beam projection data to second areas to create a set of 2.pi. radians of complete projection data. The 2.pi. of projection data is divided into half scans which are interpolated and extrapolated to produce a new projection set at the slice plane with reduced helical offset error. A feathering function is used to blend the discontinuities in the interpolation and extrapolation weights to prevent streak image artifacts.

REFERENCES:
patent: 4284896 (1981-08-01), Stonestrom
patent: 4630202 (1986-12-01), Mori
patent: 4789929 (1988-12-01), Nishimura et al.
patent: 5073911 (1991-12-01), Ozaki et al.

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