Use of body boundary information to perform iterative reconstruc

Details Use of body boundary information to perform iterative reconstruc Use of body boundary information to perform iterative reconstruc

1996-03-27

1998-04-14

Porta, David P.

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25036302, 250369, G01T 1166

Patent

active

057395390

ABSTRACT:
A method of performing image reconstruction in a gamma camera system comprises the steps of performing a transmission scan of an object about a number of rotation angles to collect transmission projection data and performing an emission scan of the object about numerous rotation angles to collect emission projection data. The outer boundary of the object is then located based on the transmission projection data. Information identifying the boundary is then either stored in a separate body contour map or embedded in an attenuation map. The information identifying the boundary can be in the form of flags indicating whether individual pixels are inside or outside the boundary of the object. The emission projection data is then reconstructed, using the attenuation map if desired, to generate transverse slice images. By using the body boundary information, portions of the emission projection data representing points outside the boundary of the object are not reconstructed in order to reduce total reconstruction time.

REFERENCES:
patent: 4984159 (1991-01-01), Gullberg
patent: 5338936 (1994-08-01), Gullberg et al.

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