X-ray CT apparatus, upsampling method of projection data, and image reconstruction method
US10342500B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2015 |
| Grant date | Jul 9, 2019 |
| Priority date | — |
| Expiry date | Oct 13, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/469
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a case where helical scanning, etc., is performed in an X-ray CT apparatus, upsampled projection data that more approximates to an observed value is obtained. There is provided an X-ray CT apparatus that improves spatial resolution of an overall effective field of view without reducing rotation speed, in an FFS method of acquiring projection data through moving of an X-ray focus position to a plurality of positions. The X-ray CT apparatus: converts projection data acquired through helical scanning into projection data of normal scanning performed by one rotation; generates a virtual-counter-data space in which virtual counter data are acquired on substantially coincident X-ray transmission path in the converted projection data; performs upsampling in a view direction; and similarly upsamples FFS projection data in the view direction for focus-shifted projection data obtained by performing the helical scanning while causing the X-ray focus position to shift (virtual counter data space generation).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.