The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 1997
Filed:
Mar. 13, 1996
Lai Ching-Ming, Wakefield, MA (US);
Analogic Corporation, Peabody, MA (US);
Abstract
The disclosed motion artifact filter generates motion corrected signals from projection data signals to compensate for motion artifacts in CT images. Each measurement of the projection data signals is representative of the density of all the mass occupying a volume between an X-ray source and a detector at a particular projection angle. The motion artifact filter includes a high pass filter for generating high frequency signals representative of patient movement. Each measurement of the high frequency signals is generated by combining groups of measurements of the projection data signals corresponding to volumes that are proximal to each other. Each measurement of the motion corrected signals is generated by subtracting a portion of a measurement of a high frequency signal from its associated measurement of a projection data signal. The portions increase as the projection angle approaches a starting angle and the portions decrease as the projection angle approaches an intermediate angle.