Over-range image artifact reduction in tomographic imaging

Details Over-range image artifact reduction in tomographic imaging Over-range image artifact reduction in tomographic imaging

1991-11-27

1992-11-17

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

36441316, 382 50, G06K 900, G06F 1542

Patent

active

051651009

ABSTRACT:
An apparatus for reducing image artifacts caused by over-ranging or clipping of the data collected in a tomographic scan fits a geometric model to the in-range data of each projection. The geometric model is sized to the in-range data by summing all of the data of the projection to obtain a value of the total slice volume. This geometric model is used to compute the slope of the over-range data from the last point of in-range data and this extrapolated data is substituted for the over-range data. The correction process is implemented in pipeline form by convolving an over-range mask indicating which data is in-range and which data is over-range with a box car convolution kernel which produces a trapezoidal correction mask. This correction mask, multiplied by the uncorrected projection data provides the appropriate slope to its clipped portions.

REFERENCES:
patent: 5056146 (1991-10-01), Nishide
patent: 5067163 (1991-11-01), Adachi
patent: 5072382 (1991-12-01), Kamentsky
patent: 5079698 (1992-01-01), Grenier et al.

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