System and method for scatter normalization of PET images
US8193505B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2009 |
| Grant date | Jun 5, 2012 |
| Priority date | — |
| Expiry date | Sep 17, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01T1/1647
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
In positron emission tomography (PET), a detector's response to scattered radiation may be different from its response to unscattered (true coincidence) photons. This difference should be accounted for during normalization and scatter correction. The disclosure shows that only a knowledge of the ratio of the scatter to trues efficiencies is necessary, however. A system and method are disclosed for measuring the scatter/trues detection efficiency ratio, as well as for applying this compensation during the scatter correction of PET emission data. PET detector efficiencies are measured in two steps, the first using a plane radiation source, and the second using a plane radiation source in combination with a scattering medium. A ratio of the scatter and trues detection efficiency is obtained from this data for each detector/crystal, and is applied as a correction factor to PET data obtained during medical imaging processes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.