X-ray CT apparatus and image reconstruction method
US7949090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2008 |
| Grant date | May 24, 2011 |
| Priority date | — |
| Expiry date | Jan 23, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/035
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An X-ray CT apparatus is provided for reducing the amount of computation at image reconstruction thereby to shorten an image reconstruction time. The X-ray CT apparatus comprises a cradle which moves in a horizontal direction to convey a subject to a photography space, an X-ray detector comprising a plurality of detecting element rows, for obtaining projection data by a helical scan when the cradle is moved under acceleration/deceleration and at a constant velocity, and backprojection processing device for performing a backprojection process on the projection data. When image reconstruction is carried out using the projection data acquired when the cradle is moved under acceleration/deceleration, the backprojection processing device assumes a virtual image reconstruction plane P′ where the cradle is assumed to be moved at the constant velocity, with respect to an image reconstruction plane P of each view and backprojects projection data onto the virtual image reconstruction plane P′.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.