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:
May. 25, 2010
Filed:
Jun. 27, 2007
Ram Naidu, Newton, MA (US);
Basak Ulker Karbeyaz, Malden, MA (US);
Zhengrong Ying, Wakefield, MA (US);
Sergey Simanovsky, Brookline, MA (US);
Matthew Hirsch, Somerville, MA (US);
David Schafer, Rowley, MA (US);
Carl R. Crawford, Brookline, MA (US);
Ram Naidu, Newton, MA (US);
Basak Ulker Karbeyaz, Malden, MA (US);
Zhengrong Ying, Wakefield, MA (US);
Sergey Simanovsky, Brookline, MA (US);
Matthew Hirsch, Somerville, MA (US);
David Schafer, Rowley, MA (US);
Carl R. Crawford, Brookline, MA (US);
Analogic Corporation, Peabody, MA (US);
Abstract
A method of and a system for variable pitch CT scanning for baggage screening and variable pitch image reconstruction are disclosed. The method comprises decelerating conveyor belt speed when additional time is needed to render a decision on a complex bag; accelerating conveyor belt speed to its normal speed when decisions are reached on undecided bags; generating cone-beam projection data at variable scanning pitch corresponding to variable conveyor belt speed; computing a tilt angle and a distance offset for each tilted slice using the pitch values at which the cone-beam projection data is acquired for that tilted slice; generating fan-beam projection data for each tilted slice using the tilted angle and the distance offset; generating correction projection data to compensate for the error between the source trajectory and the tilted reconstruction plane; generating the corrected fan-beam projection data by adding the correction projection data to the fan-beam projection data; reconstructing tilted slices using the corrected fan-beam projection data; and interpolating the reconstructed tilted slices into axial slices.