Progressive updating approach for volumetric CT image...

Details Progressive updating approach for volumetric CT image... Progressive updating approach for volumetric CT image...

2005-02-01

2005-02-01

Bruce, David V. (Department: 2882)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

C378S015000, C378S901000

Reexamination Certificate

active

06850585

ABSTRACT:
In overlapping reconstruction for multi-slide spiral CT, adjacent slices of an object typically only have small differences. Based on this property, a progressive updating approach for volumetric ct image reconstruction includes a method and apparatus to use the well-known ordered subset expectation maximization (OSEM) formula or other iterative algorithms for spiral CT overlapping reconstruction. The imaging geometry is assumed to be single-slice helical/spiral scanning. To start with, a complete set of projections is synthesized via linear interpolation of data associated with opposite rays for reconstruction of the first slice. Then, new data are incrementally utilized for reconstruction of subsequent slices by updating the previous slice using the OSEM approach. To overcome accumulative errors, traditional reconstruction from a complete set of projections is performed when it is necessary as is determined by dynamically monitoring the relevant errors.

REFERENCES:
patent: 6246742 (2001-06-01), Besson et al.
patent: 6366638 (2002-04-01), Hsieh et al.
patent: 6381297 (2002-04-01), Hsieh
patent: 6385278 (2002-05-01), Hsieh

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