X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-10-02
2000-08-08
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, A61B 603
Patent
active
06101236&
ABSTRACT:
In the present invention, an iterative process is provided for computed tomographic fluoroscopy (CTF) based upon an ordered-subset based algorithm or an adaptation of the row-action expectation maximization (RAEM) formula. This process is applied to reduce metal artifacts in CTF imaging, reduce image noise and provide rapid-image updating suitable for real-time applications. In one embodiment, generation of a projection mask and computation of a relaxation matrix are used to compensate for beam divergence and data incompleteness, and a priori knowledge such as a known image support is used to reduce image reconstruction errors.
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Schweiger Gary D.
Vannier Michael W.
Wang Ge
Bruce David V.
University of Iowa Research Foundation
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