Method and apparatus for performing correction of emission contamination and deadtime loss in a medical imaging system
US6410920B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1999 |
| Grant date | Jun 25, 2002 |
| Priority date | — |
| Expiry date | Sep 21, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B6/037
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method of correcting for deadtime and for emission contamination of a transmission scan in a nuclear camera system is provided. The transmission scan is used to correct positron emission tomography (PET) images for attenuation. The camera system includes two detectors and two corresponding single-photon point sources that are collimated to produce fanbeam illumination profiles. A transmission detection window and an emission contamination detection window is defined on each detector. Radiation from each source is scanned axially across the field of view of the corresponding detector in synchronization with the corresponding transmission detection window to acquire transmission projection data. The emission contamination detection windows are also scanned axially concurrently with, but offset from, the transmission detection windows to acquire emission data. Events detected in the transmission detection windows are used to add counts from appropriate locations of the transmission projection on an event-by-event basis in real-time. Events detected in the emission contamination detection windows are used to subtract counts from appropriate locations of the transmission projection on…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.