Dynamic bandwidth reconstruction

Details Dynamic bandwidth reconstruction Dynamic bandwidth reconstruction

1989-11-17

1994-01-04

Envall, Jr., Roy N.

Boots, shoes, and leggings

G06F 1500

Patent

active

052766144

ABSTRACT:
A scanner (A), such as a CT or MR scanner, non-invasively examines a region of interest of subject and generates a plurality of views indicative thereof which are reconstructible into an image representation. A filter control (14) generates a bandwidth scaling factor (BWF.sub..theta.) and a bandwidth offset (BWO) for each view. Preferably, the selected bandwidth scaling factor is the maximum of a plurality of bandwidth scaling factors based on different criteria including noise, missing views, material surrounding the region of interest, or noise texture. The bandwidth scaling factor is then used to address a filter curve look up table (18) to select from a plurality (N.sub.T) of filter values. The digital filter values are interpolated (20) or extrapolated as necessary to match the number of values (N.sub.S) in each sampled view. The digital filter values and the view values are multiplied (22) point by point to create filtered views which are reconstructed (30) into the image representation for storage in an image memory (32) or displayed on a video monitor (34).

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Convolution Algorithms for Arbitrary Projection Angles by Mark E. Davison and F. A. Grunbaum, IEEE TRans. on Nuc. Sci., vol. NS-26, No. 2, Apr. 1979.

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