Cone beam reconstruction using combined circle and line orbits
US5170439A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1991 |
| Grant date | Dec 8, 1992 |
| Priority date | — |
| Expiry date | Jun 11, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S378/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Radiation passing through a cone-beam collimator is received by a radiation detector, such as a gamma camera head, as the gamma camera head is moved in a circular orbit and in a line orbit. Data collected during the circular orbit is stored (42c), transformed (50c) into the frequency domain and redundant data removed (52c, 52c), and transformed (56c) back to the spatial domain. The data collected during the line orbit is stored (42l). The line orbit data is transformed to the frequency domain and repeatedly filtered with a family of filter functions (52l, 54) to remove redundant data. Each filter function corresponds to a different row through the examination region. The filtered frequency domain slice data sets (62.sub.1, 62.sub.2, . . . , 62.sub.n) are transformed (56l) back to the spatial domain and transferred to a central portion of a spatial domain memory (58l). Empty memory cells of the memory (58l) are filled with zeros. The spatial domain data from memories (58c b, 58l) are filtered (72c, 72l), backprojected (74c, 74l), and summed (76) into a three-dimensional image representation that is stored in an image memory (78).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.