Method of producing interpolation data, method of inferring posi

Details Method of producing interpolation data, method of inferring posi Method of producing interpolation data, method of inferring posi

1996-10-21

1998-03-24

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

378901, A61B 603

Patent

active

057321175

ABSTRACT:
A data processing technique for X-ray computerized tomography (CT) calculates the difference of two pieces of data having a same X-ray trajectory and existing on both sides of a plane of concern, and accumulates the differential value in a coordinate-correspondent buffer of respective xy coordinates on the X-ray trajectory. It repeats the operation for raw data of at least one turn on one side of the plane of concern, and stores the accumulative values in the buffers together with the z-axis position of the plane of concern. It repeats the operation while varying the z-axis position within a prescribed range on the plane of concern, and infers, based on the distribution along z-axis positions of the accumulative values in the buffers of same xy coordinates, the z-axis position of sharp varying plane of X-ray absorption coefficients relevant to the xy coordinates. It calculates weighting factors based on the relation between the slicing position, slice thickness and position of a sharp varying plane of X-ray absorption coefficients for interpolation data, calculates the interpolation data with the weighting factors, and reconstructs an image by using the interpolation data.

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patent: 5544212 (1996-08-01), Heuscher
Multidimensional signal processing, audio and electroacoustics, Glasgow, May 23-6, 1989. vol. 3, May 23,1989, IEEE pp. 1472-1475.

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